Rebrand: polkadot → pezkuwi, substrate → bizinikiwi, kusama → dicle

packages/api-contract/README.md

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+# @pezkuwi/api-contract
+
+Interfaces to allow for the encoding and decoding of Bizinikiwi contract ABIs.

packages/api-contract/package.json

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+{
+  "author": "Jaco Greeff <jacogr@gmail.com>",
+  "bugs": "https://github.com/pezkuwichain/pezkuwi-api/issues",
+  "description": "Interfaces for interacting with contracts and contract ABIs",
+  "engines": {
+    "node": ">=18"
+  },
+  "homepage": "https://github.com/pezkuwichain/pezkuwi-api/tree/master/packages/api-contract#readme",
+  "license": "Apache-2.0",
+  "name": "@pezkuwi/api-contract",
+  "repository": {
+    "directory": "packages/api-contract",
+    "type": "git",
+    "url": "https://github.com/pezkuwichain/pezkuwi-api.git"
+  },
+  "sideEffects": [
+    "./packageDetect.js",
+    "./packageDetect.cjs"
+  ],
+  "type": "module",
+  "version": "16.5.6",
+  "main": "index.js",
+  "dependencies": {
+    "@pezkuwi/api": "16.5.4",
+    "@pezkuwi/api-augment": "16.5.4",
+    "@pezkuwi/types": "16.5.4",
+    "@pezkuwi/types-codec": "16.5.4",
+    "@pezkuwi/types-create": "16.5.4",
+    "@pezkuwi/util": "^14.0.1",
+    "@pezkuwi/util-crypto": "^14.0.1",
+    "rxjs": "^7.8.1",
+    "tslib": "^2.8.1"
+  },
+  "devDependencies": {
+    "@pezkuwi/api-augment": "16.5.4",
+    "@pezkuwi/keyring": "^14.0.1",
+    "@pezkuwi/types-support": "16.5.4"
+  }
+}

packages/api-contract/src/Abi/Abi.spec.ts

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+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@pezkuwi/dev-test/globals.d.ts" />
+
+import type { Registry } from '@pezkuwi/types/types';
+
+import fs from 'node:fs';
+import process from 'node:process';
+
+import { TypeDefInfo } from '@pezkuwi/types/types';
+import rpcMetadata from '@pezkuwi/types-support/metadata/static-bizinikiwi-contracts-node';
+import { blake2AsHex } from '@pezkuwi/util-crypto';
+
+import { Metadata, TypeRegistry } from '../../../types/src/bundle.js';
+import abis from '../test/contracts/index.js';
+import { Abi } from './index.js';
+
+interface SpecDef {
+  messages: {
+    label: string;
+    name: string[] | string
+  }[]
+}
+
+interface JSONAbi {
+  source: {
+    compiler: string,
+    hash: string,
+    language: string,
+    wasm: string
+  },
+  spec: SpecDef;
+  V1: {
+    spec: SpecDef;
+  },
+  V2: {
+    spec: SpecDef;
+  },
+  V3: {
+    spec: SpecDef;
+  },
+  V4: {
+    spec: SpecDef;
+  }
+}
+
+function stringifyInfo (key: string, value: unknown): unknown {
+  return key === 'info' && typeof value === 'number'
+    ? TypeDefInfo[value]
+    : value;
+}
+
+function stringifyJson (registry: Registry): string {
+  const defs = registry.lookup.types.map(({ id }) =>
+    registry.lookup.getTypeDef(id)
+  );
+
+  return JSON.stringify(defs, stringifyInfo, 2);
+}
+
+describe('Abi', (): void => {
+  describe('ABI', (): void => {
+    Object.entries(abis).forEach(([abiName, _abi]) => {
+      const abi = _abi as unknown as JSONAbi;
+
+      it(`initializes from a contract ABI (${abiName})`, (): void => {
+        try {
+          const messageIds = (abi.V4 || abi.V3 || abi.V2 || abi.V1 || abi).spec.messages.map(({ label, name }) =>
+            label || (
+              Array.isArray(name)
+                ? name.join('::')
+                : name
+            )
+          );
+          const inkAbi = new Abi(abis[abiName]);
+
+          expect(inkAbi.messages.map(({ identifier }) => identifier)).toEqual(messageIds);
+        } catch (error) {
+          console.error(error);
+
+          throw error;
+        }
+      });
+    });
+  });
+
+  describe('TypeDef', (): void => {
+    for (const [abiName, abiJson] of Object.entries(abis)) {
+      it(`initializes from a contract ABI: ${abiName}`, (): void => {
+        const abi = new Abi(abiJson);
+        const registryJson = stringifyJson(abi.registry);
+        const cmpFile = new URL(`../test/compare/${abiName}.test.json`, import.meta.url);
+
+        try {
+          expect(
+            JSON.parse(registryJson)
+          ).toEqual(
+            JSON.parse(fs.readFileSync(cmpFile, 'utf-8'))
+          );
+        } catch (error) {
+          if (process.env['GITHUB_REPOSITORY']) {
+            console.error(registryJson);
+
+            throw error;
+          }
+
+          fs.writeFileSync(cmpFile, registryJson, { flag: 'w' });
+        }
+      });
+    }
+  });
+
+  it('has the correct hash for the source', (): void => {
+    const abi = new Abi(abis['ink_v0_flipperBundle']);
+    const bundle = abis['ink_v0_flipperBundle'] as unknown as JSONAbi;
+
+    // manual
+    expect(bundle.source.hash).toEqual(blake2AsHex(bundle.source.wasm));
+
+    // the Codec hash
+    expect(bundle.source.hash).toEqual(abi.info.source.wasm.hash.toHex());
+
+    // the hash as per the actual Abi
+    expect(bundle.source.hash).toEqual(abi.info.source.wasmHash.toHex());
+  });
+
+  describe('Events', (): void => {
+    const registry = new TypeRegistry();
+
+    beforeAll((): void => {
+      const metadata = new Metadata(registry, rpcMetadata);
+
+      registry.setMetadata(metadata);
+    });
+
+    it('decoding <=ink!v4 event', (): void => {
+      const abiJson = abis['ink_v4_erc20Metadata'];
+
+      expect(abiJson).toBeDefined();
+      const abi = new Abi(abiJson);
+
+      const eventRecordHex =
+      '0x0001000000080360951b8baf569bca905a279c12d6ce17db7cdce23a42563870ef585129ce5dc64d010001d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d018eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a4800505a4f7e9f4eb106000000000000000c0045726332303a3a5472616e7366657200000000000000000000000000000000da2d695d3b5a304e0039e7fc4419c34fa0c1f239189c99bb72a6484f1634782b2b00c7d40fe6d84d660f3e6bed90f218e022a0909f7e1a7ea35ada8b6e003564';
+      const record = registry.createType('EventRecord', eventRecordHex);
+
+      const decodedEvent = abi.decodeEvent(record);
+
+      expect(decodedEvent.event.args.length).toEqual(3);
+      expect(decodedEvent.args.length).toEqual(3);
+      expect(decodedEvent.event.identifier).toEqual('Transfer');
+
+      const decodedEventHuman = decodedEvent.event.args.reduce((prev, cur, index) => {
+        return {
+          ...prev,
+          [cur.name]: decodedEvent.args[index].toHuman()
+        };
+      }, {});
+
+      const expectedEvent = {
+        from: '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY',
+        to: '5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty',
+        value: '123.4567 MUnit'
+      };
+
+      expect(decodedEventHuman).toEqual(expectedEvent);
+    });
+
+    it('decoding >=ink!v5 event', (): void => {
+      const abiJson = abis['ink_v5_erc20Metadata'];
+
+      expect(abiJson).toBeDefined();
+      const abi = new Abi(abiJson);
+
+      const eventRecordHex =
+    '0x00010000000803da17150e96b3955a4db6ad35ddeb495f722f9c1d84683113bfb096bf3faa30f2490101d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d018eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a4800505a4f7e9f4eb106000000000000000cb5b61a3e6a21a16be4f044b517c28ac692492f73c5bfd3f60178ad98c767f4cbd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48';
+      const record = registry.createType('EventRecord', eventRecordHex);
+
+      const decodedEvent = abi.decodeEvent(record);
+
+      expect(decodedEvent.event.args.length).toEqual(3);
+      expect(decodedEvent.args.length).toEqual(3);
+      expect(decodedEvent.event.identifier).toEqual('erc20::erc20::Transfer');
+
+      const decodedEventHuman = decodedEvent.event.args.reduce((prev, cur, index) => {
+        return {
+          ...prev,
+          [cur.name]: decodedEvent.args[index].toHuman()
+        };
+      }, {});
+
+      const expectedEvent = {
+        from: '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY',
+        to: '5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty',
+        value: '123.4567 MUnit'
+      };
+
+      expect(decodedEventHuman).toEqual(expectedEvent);
+    });
+
+    it('decoding >=ink!v5 anonymous event', (): void => {
+      const abiJson = abis['ink_v5_erc20AnonymousTransferMetadata'];
+
+      expect(abiJson).toBeDefined();
+      const abi = new Abi(abiJson);
+
+      expect(abi.events[0].identifier).toEqual('erc20::erc20::Transfer');
+      expect(abi.events[0].signatureTopic).toEqual(null);
+
+      const eventRecordWithAnonymousEventHex = '0x00010000000803538e726248a9c155911e7d99f4f474c3408630a2f6275dd501d4471c7067ad2c490101d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d018eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a4800505a4f7e9f4eb1060000000000000008d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48';
+      const record = registry.createType('EventRecord', eventRecordWithAnonymousEventHex);
+
+      const decodedEvent = abi.decodeEvent(record);
+
+      expect(decodedEvent.event.args.length).toEqual(3);
+      expect(decodedEvent.args.length).toEqual(3);
+      expect(decodedEvent.event.identifier).toEqual('erc20::erc20::Transfer');
+
+      const decodedEventHuman = decodedEvent.event.args.reduce((prev, cur, index) => {
+        return {
+          ...prev,
+          [cur.name]: decodedEvent.args[index].toHuman()
+        };
+      }, {});
+
+      const expectedEvent = {
+        from: '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY',
+        to: '5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty',
+        value: '123.4567 MUnit'
+      };
+
+      expect(decodedEventHuman).toEqual(expectedEvent);
+    });
+  });
+});

packages/api-contract/src/Abi/index.ts

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+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { Bytes, Vec } from '@pezkuwi/types';
+import type { ChainProperties, ContractConstructorSpecLatest, ContractEventParamSpecLatest, ContractMessageParamSpecLatest, ContractMessageSpecLatest, ContractMetadata, ContractMetadataV4, ContractMetadataV5, ContractMetadataV6, ContractProjectInfo, ContractTypeSpec, EventRecord } from '@pezkuwi/types/interfaces';
+import type { Codec, Registry, TypeDef } from '@pezkuwi/types/types';
+import type { AbiConstructor, AbiEvent, AbiEventParam, AbiMessage, AbiMessageParam, AbiParam, DecodedEvent, DecodedMessage } from '../types.js';
+
+import { Option, TypeRegistry } from '@pezkuwi/types';
+import { TypeDefInfo } from '@pezkuwi/types-create';
+import { assertReturn, compactAddLength, compactStripLength, isBn, isNumber, isObject, isString, isUndefined, logger, stringCamelCase, stringify, u8aConcat, u8aToHex } from '@pezkuwi/util';
+
+import { convertVersions, enumVersions } from './toLatestCompatible.js';
+
+interface AbiJson {
+  version?: string;
+
+  [key: string]: unknown;
+}
+
+type EventOf<M> = M extends {spec: { events: Vec<infer E>}} ? E : never
+export type ContractMetadataSupported = ContractMetadataV4 | ContractMetadataV5 | ContractMetadataV6;
+type ContractEventSupported = EventOf<ContractMetadataSupported>;
+
+const l = logger('Abi');
+
+const PRIMITIVE_ALWAYS = ['AccountId', 'AccountId20', 'AccountIndex', 'Address', 'Balance'];
+
+function findMessage <T extends AbiMessage> (list: T[], messageOrId: T | string | number): T {
+  const message = isNumber(messageOrId)
+    ? list[messageOrId]
+    : isString(messageOrId)
+      ? list.find(({ identifier }) => [identifier, stringCamelCase(identifier)].includes(messageOrId.toString()))
+      : messageOrId;
+
+  return assertReturn(message, () => `Attempted to call an invalid contract interface, ${stringify(messageOrId)}`);
+}
+
+function getMetadata (registry: Registry, json: AbiJson): ContractMetadataSupported {
+  // this is for V1, V2, V3
+  const vx = enumVersions.find((v) => isObject(json[v]));
+
+  // this was added in V4
+  const jsonVersion = json.version;
+
+  if (!vx && jsonVersion && !enumVersions.find((v) => v === `V${jsonVersion}`)) {
+    throw new Error(`Unable to handle version ${jsonVersion}`);
+  }
+
+  const metadata = registry.createType<ContractMetadata>('ContractMetadata',
+    vx
+      ? { [vx]: json[vx] }
+      : jsonVersion
+        ? { [`V${jsonVersion}`]: json }
+        : { V0: json }
+  );
+
+  const converter = convertVersions.find(([v]) => metadata[`is${v}`]);
+
+  if (!converter) {
+    throw new Error(`Unable to convert ABI with version ${metadata.type} to a supported version`);
+  }
+
+  const upgradedMetadata = converter[1](registry, metadata[`as${converter[0]}`]);
+
+  return upgradedMetadata;
+}
+
+function isRevive (json: Record<string, unknown>): boolean {
+  const source = json['source'];
+  const version = json['version'];
+
+  const hasContractBinary =
+    typeof source === 'object' &&
+    source !== null &&
+    'contract_binary' in source;
+
+  const hasVersion =
+    typeof version === 'number' && version >= 6;
+
+  return hasContractBinary || hasVersion;
+}
+
+function parseJson (json: Record<string, unknown>, chainProperties?: ChainProperties): [Record<string, unknown>, Registry, ContractMetadataSupported, ContractProjectInfo, boolean] {
+  const registry = new TypeRegistry();
+
+  const revive = isRevive(json);
+  const typeName = revive ? 'ContractReviveProjectInfo' : 'ContractProjectInfo';
+
+  const info = registry.createType(typeName, json) as unknown as ContractProjectInfo;
+  const metadata = getMetadata(registry, json as unknown as AbiJson);
+  const lookup = registry.createType('PortableRegistry', { types: metadata.types }, true);
+
+  // attach the lookup to the registry - now the types are known
+  registry.setLookup(lookup);
+
+  if (chainProperties) {
+    registry.setChainProperties(chainProperties);
+  }
+
+  // warm-up the actual type, pre-use
+  lookup.types.forEach(({ id }) =>
+    lookup.getTypeDef(id)
+  );
+
+  return [json, registry, metadata, info, revive];
+}
+
+/**
+ * @internal
+ * Determines if the given input value is a ContractTypeSpec
+ */
+function isTypeSpec (value: Codec): value is ContractTypeSpec {
+  return !!value && value instanceof Map && !isUndefined((value as ContractTypeSpec).type) && !isUndefined((value as ContractTypeSpec).displayName);
+}
+
+/**
+ * @internal
+ * Determines if the given input value is an Option
+ */
+function isOption (value: Codec): value is Option<Codec> {
+  return !!value && value instanceof Option;
+}
+
+export class Abi {
+  readonly events: AbiEvent[];
+  readonly constructors: AbiConstructor[];
+  readonly info: ContractProjectInfo;
+  readonly json: Record<string, unknown>;
+  readonly messages: AbiMessage[];
+  readonly metadata: ContractMetadataSupported;
+  readonly registry: Registry;
+  readonly environment = new Map<string, TypeDef | Codec>();
+  readonly isRevive: boolean;
+
+  constructor (abiJson: Record<string, unknown> | string, chainProperties?: ChainProperties) {
+    [this.json, this.registry, this.metadata, this.info, this.isRevive] = parseJson(
+      isString(abiJson)
+        ? JSON.parse(abiJson) as Record<string, unknown>
+        : abiJson,
+      chainProperties
+    );
+    this.constructors = this.metadata.spec.constructors.map((spec: ContractConstructorSpecLatest, index) =>
+      this.#createMessage(spec, index, {
+        isConstructor: true,
+        isDefault: spec.default.isTrue,
+        isPayable: spec.payable.isTrue,
+        returnType: spec.returnType.isSome
+          ? this.registry.lookup.getTypeDef(spec.returnType.unwrap().type)
+          : null
+      })
+    );
+    this.events = this.metadata.spec.events.map((_: ContractEventSupported, index: number) =>
+      this.#createEvent(index)
+    );
+    this.messages = this.metadata.spec.messages.map((spec: ContractMessageSpecLatest, index): AbiMessage =>
+      this.#createMessage(spec, index, {
+        isDefault: spec.default.isTrue,
+        isMutating: spec.mutates.isTrue,
+        isPayable: spec.payable.isTrue,
+        returnType: spec.returnType.isSome
+          ? this.registry.lookup.getTypeDef(spec.returnType.unwrap().type)
+          : null
+      })
+    );
+
+    // NOTE See the rationale for having Option<...> values in the actual
+    // ContractEnvironmentV4 structure definition in interfaces/contractsAbi
+    // (Due to conversions, the fields may not exist)
+    for (const [key, opt] of this.metadata.spec.environment.entries()) {
+      if (isOption(opt)) {
+        if (opt.isSome) {
+          const value = opt.unwrap();
+
+          if (isBn(value)) {
+            this.environment.set(key, value);
+          } else if (isTypeSpec(value)) {
+            this.environment.set(key, this.registry.lookup.getTypeDef(value.type));
+          } else {
+            throw new Error(`Invalid environment definition for ${key}:: Expected either Number or ContractTypeSpec`);
+          }
+        }
+      } else {
+        throw new Error(`Expected Option<*> definition for ${key} in ContractEnvironment`);
+      }
+    }
+  }
+
+  /**
+   * Warning: Unstable API, bound to change
+   */
+  public decodeEvent (record: EventRecord): DecodedEvent {
+    switch (this.metadata.version.toString()) {
+      // earlier version are hoisted to v4
+      case '4':
+        return this.#decodeEventV4(record);
+      case '5':
+        return this.#decodeEventV5(record);
+      // Latest
+      default:
+        return this.#decodeEventV6(record);
+    }
+  }
+
+  #decodeEventV6 = (record: EventRecord): DecodedEvent => {
+    const topics = record.event.data[2] as unknown as { toHex: () => string }[];
+    // Try to match by signature topic (first topic)
+    const signatureTopic = topics[0];
+    const data = record.event.data[1] as Bytes;
+
+    if (signatureTopic) {
+      const event = this.events.find((e) => e.signatureTopic !== undefined && e.signatureTopic !== null && e.signatureTopic === signatureTopic.toHex());
+
+      // Early return if event found by signature topic
+      if (event) {
+        return event.fromU8a(data);
+      }
+    }
+
+    // If no event returned yet, it might be anonymous
+    const amountOfTopics = topics.length;
+    const potentialEvents = this.events.filter((e) => {
+      // event can't have a signature topic
+      if (e.signatureTopic !== null && e.signatureTopic !== undefined) {
+        return false;
+      }
+
+      // event should have same amount of indexed fields as emitted topics
+      const amountIndexed = e.args.filter((a) => a.indexed).length;
+
+      if (amountIndexed !== amountOfTopics) {
+        return false;
+      }
+
+      // If all conditions met, it's a potential event
+      return true;
+    });
+
+    if (potentialEvents.length === 1) {
+      return potentialEvents[0].fromU8a(data);
+    }
+
+    throw new Error('Unable to determine event');
+  };
+
+  #decodeEventV5 = (record: EventRecord): DecodedEvent => {
+    // Find event by first topic, which potentially is the signature_topic
+    const signatureTopic = record.topics[0];
+    const data = record.event.data[1] as Bytes;
+
+    if (signatureTopic) {
+      const event = this.events.find((e) => e.signatureTopic !== undefined && e.signatureTopic !== null && e.signatureTopic === signatureTopic.toHex());
+
+      // Early return if event found by signature topic
+      if (event) {
+        return event.fromU8a(data);
+      }
+    }
+
+    // If no event returned yet, it might be anonymous
+    const amountOfTopics = record.topics.length;
+    const potentialEvents = this.events.filter((e) => {
+      // event can't have a signature topic
+      if (e.signatureTopic !== null && e.signatureTopic !== undefined) {
+        return false;
+      }
+
+      // event should have same amount of indexed fields as emitted topics
+      const amountIndexed = e.args.filter((a) => a.indexed).length;
+
+      if (amountIndexed !== amountOfTopics) {
+        return false;
+      }
+
+      // If all conditions met, it's a potential event
+      return true;
+    });
+
+    if (potentialEvents.length === 1) {
+      return potentialEvents[0].fromU8a(data);
+    }
+
+    throw new Error('Unable to determine event');
+  };
+
+  #decodeEventV4 = (record: EventRecord): DecodedEvent => {
+    const data = record.event.data[1] as Bytes;
+    const index = data[0];
+    const event = this.events[index];
+
+    if (!event) {
+      throw new Error(`Unable to find event with index ${index}`);
+    }
+
+    return event.fromU8a(data.subarray(1));
+  };
+
+  /**
+   * Warning: Unstable API, bound to change
+   */
+  public decodeConstructor (data: Uint8Array): DecodedMessage {
+    return this.#decodeMessage('message', this.constructors, data);
+  }
+
+  /**
+   * Warning: Unstable API, bound to change
+   */
+  public decodeMessage (data: Uint8Array): DecodedMessage {
+    return this.#decodeMessage('message', this.messages, data);
+  }
+
+  public findConstructor (constructorOrId: AbiConstructor | string | number): AbiConstructor {
+    return findMessage(this.constructors, constructorOrId);
+  }
+
+  public findMessage (messageOrId: AbiMessage | string | number): AbiMessage {
+    return findMessage(this.messages, messageOrId);
+  }
+
+  #createArgs = (args: ContractMessageParamSpecLatest[] | ContractEventParamSpecLatest[], spec: unknown): AbiParam[] => {
+    return args.map(({ label, type }, index): AbiParam => {
+      try {
+        if (!isObject(type)) {
+          throw new Error('Invalid type definition found');
+        }
+
+        const displayName = type.displayName.length
+          ? type.displayName[type.displayName.length - 1].toString()
+          : undefined;
+        const camelName = stringCamelCase(label);
+
+        if (displayName && PRIMITIVE_ALWAYS.includes(displayName)) {
+          return {
+            name: camelName,
+            type: {
+              info: TypeDefInfo.Plain,
+              type: displayName
+            }
+          };
+        }
+
+        const typeDef = this.registry.lookup.getTypeDef(type.type);
+
+        return {
+          name: camelName,
+          type: displayName && !typeDef.type.startsWith(displayName)
+            ? { displayName, ...typeDef }
+            : typeDef
+        };
+      } catch (error) {
+        l.error(`Error expanding argument ${index} in ${stringify(spec)}`);
+
+        throw error;
+      }
+    });
+  };
+
+  #createMessageParams = (args: ContractMessageParamSpecLatest[], spec: unknown): AbiMessageParam[] => {
+    return this.#createArgs(args, spec);
+  };
+
+  #createEventParams = (args: ContractEventParamSpecLatest[], spec: unknown): AbiEventParam[] => {
+    const params = this.#createArgs(args, spec);
+
+    return params.map((p, index): AbiEventParam => ({ ...p, indexed: args[index].indexed.toPrimitive() }));
+  };
+
+  #createEvent = (index: number): AbiEvent => {
+    // TODO TypeScript would narrow this type to the correct version,
+    // but version is `Text` so I need to call `toString()` here,
+    // which breaks the type inference.
+    switch (this.metadata.version.toString()) {
+      case '4':
+        return this.#createEventV4((this.metadata as ContractMetadataV4).spec.events[index], index);
+      default:
+        return this.#createEventV5((this.metadata as ContractMetadataV5).spec.events[index], index);
+    }
+  };
+
+  #createEventV5 = (spec: EventOf<ContractMetadataV5>, index: number): AbiEvent => {
+    const args = this.#createEventParams(spec.args, spec);
+    const event = {
+      args,
+      docs: spec.docs.map((d) => d.toString()),
+      fromU8a: (data: Uint8Array): DecodedEvent => ({
+        args: this.#decodeArgs(args, data),
+        event
+      }),
+      identifier: [spec.module_path, spec.label].join('::'),
+      index,
+      signatureTopic: spec.signature_topic.isSome ? spec.signature_topic.unwrap().toHex() : null
+    };
+
+    return event;
+  };
+
+  #createEventV4 = (spec: EventOf<ContractMetadataV4>, index: number): AbiEvent => {
+    const args = this.#createEventParams(spec.args, spec);
+    const event = {
+      args,
+      docs: spec.docs.map((d) => d.toString()),
+      fromU8a: (data: Uint8Array): DecodedEvent => ({
+        args: this.#decodeArgs(args, data),
+        event
+      }),
+      identifier: spec.label.toString(),
+      index
+    };
+
+    return event;
+  };
+
+  #createMessage = (spec: ContractMessageSpecLatest | ContractConstructorSpecLatest, index: number, add: Partial<AbiMessage> = {}): AbiMessage => {
+    const args = this.#createMessageParams(spec.args, spec);
+    const identifier = spec.label.toString();
+    const message = {
+      ...add,
+      args,
+      docs: spec.docs.map((d) => d.toString()),
+      fromU8a: (data: Uint8Array): DecodedMessage => ({
+        args: this.#decodeArgs(args, data),
+        message
+      }),
+      identifier,
+      index,
+      isDefault: spec.default.isTrue,
+      method: stringCamelCase(identifier),
+      path: identifier.split('::').map((s) => stringCamelCase(s)),
+      selector: spec.selector,
+      toU8a: (params: unknown[]) =>
+        this.#encodeMessageArgs(spec, args, params)
+    };
+
+    return message;
+  };
+
+  #decodeArgs = (args: AbiParam[], data: Uint8Array): Codec[] => {
+    // for decoding we expect the input to be just the arg data, no selectors
+    // no length added (this allows use with events as well)
+    let offset = 0;
+
+    return args.map(({ type: { lookupName, type } }): Codec => {
+      const value = this.registry.createType(lookupName || type, data.subarray(offset));
+
+      offset += value.encodedLength;
+
+      return value;
+    });
+  };
+
+  #decodeMessage = (type: 'constructor' | 'message', list: AbiMessage[], data: Uint8Array): DecodedMessage => {
+    const [, trimmed] = compactStripLength(data);
+    const selector = trimmed.subarray(0, 4);
+    const message = list.find((m) => m.selector.eq(selector));
+
+    if (!message) {
+      throw new Error(`Unable to find ${type} with selector ${u8aToHex(selector)}`);
+    }
+
+    return message.fromU8a(trimmed.subarray(4));
+  };
+
+  #encodeMessageArgs = ({ label, selector }: ContractMessageSpecLatest | ContractConstructorSpecLatest, args: AbiMessageParam[], data: unknown[]): Uint8Array => {
+    if (data.length !== args.length) {
+      throw new Error(`Expected ${args.length} arguments to contract message '${label.toString()}', found ${data.length}`);
+    }
+
+    return compactAddLength(
+      u8aConcat(
+        this.registry.createType('ContractSelector', selector).toU8a(),
+        ...args.map(({ type: { lookupName, type } }, index) =>
+          this.registry.createType(lookupName || type, data[index]).toU8a()
+        )
+      )
+    );
+  };
+}

packages/api-contract/src/Abi/toLatestCompatible.spec.ts

@@ -0,0 +1,219 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@pezkuwi/dev-test/globals.d.ts" />
+
+import { TypeRegistry } from '@pezkuwi/types';
+
+import abis from '../test/contracts/index.js';
+import { v0ToLatestCompatible, v1ToLatestCompatible, v2ToLatestCompatible, v3ToLatestCompatible, v4ToLatestCompatible, v5ToLatestCompatible, v6ToLatestCompatible } from './toLatestCompatible.js';
+
+describe('v0ToLatestCompatible', (): void => {
+  const registry = new TypeRegistry();
+  const contract = registry.createType('ContractMetadata', { V0: abis['ink_v0_erc20'] });
+  const latest = v0ToLatestCompatible(registry, contract.asV0);
+
+  it('has the correct constructors', (): void => {
+    expect(
+      latest.spec.constructors.map(({ label }) => label.toString())
+    ).toEqual(['new']);
+  });
+
+  it('has the correct messages', (): void => {
+    expect(
+      latest.spec.messages.map(({ label }) => label.toString())
+    ).toEqual(['total_supply', 'balance_of', 'allowance', 'transfer', 'approve', 'transfer_from']);
+  });
+
+  it('has the correct events', (): void => {
+    expect(
+      latest.spec.events.map(({ label }) => label.toString())
+    ).toEqual(['Transfer', 'Approval']);
+  });
+
+  it('has the correct constructor arguments', (): void => {
+    expect(
+      latest.spec.constructors[0].args.map(({ label }) => label.toString())
+    ).toEqual(['initial_supply']);
+  });
+
+  it('has the correct message arguments', (): void => {
+    expect(
+      latest.spec.messages[1].args.map(({ label }) => label.toString())
+    ).toEqual(['owner']);
+  });
+
+  it('has the correct event arguments', (): void => {
+    expect(
+      latest.spec.events[0].args.map(({ label }) => label.toString())
+    ).toEqual(['from', 'to', 'value']);
+  });
+
+  it('has the latest compatible version number', (): void => {
+    expect(latest.version.toString()).toEqual('4');
+  });
+});
+
+describe('v1ToLatestCompatible', (): void => {
+  const registry = new TypeRegistry();
+  const contract = registry.createType('ContractMetadata', { V1: abis['ink_v1_flipper']['V1'] });
+  const latest = v1ToLatestCompatible(registry, contract.asV1);
+
+  it('has the correct constructors', (): void => {
+    expect(
+      latest.spec.constructors.map(({ label }) => label.toString())
+    ).toEqual(['new', 'default']);
+  });
+
+  it('has the correct messages', (): void => {
+    expect(
+      latest.spec.messages.map(({ label }) => label.toString())
+    ).toEqual(['flip', 'get']);
+  });
+
+  it('has the correct messages with namespaced method name', (): void => {
+    const contract = registry.createType('ContractMetadata', { V1: abis['ink_v1_psp22']['V1'] });
+    const latest = v1ToLatestCompatible(registry, contract.asV1);
+
+    expect(
+      latest.spec.messages.map(({ label }) => label.toString())
+    ).toEqual([
+      'PSP22Metadata::token_name', 'PSP22Metadata::token_symbol', 'PSP22Metadata::token_decimals', 'PSP22Mintable::mint', 'PSP22::decrease_allowance', 'PSP22::transfer', 'PSP22::approve', 'PSP22::allowance', 'PSP22::transfer_from', 'PSP22::balance_of', 'PSP22::increase_allowance', 'PSP22::total_supply', 'pause', 'unpause'
+    ]);
+  });
+
+  it('has the correct constructor arguments', (): void => {
+    expect(
+      latest.spec.constructors[0].args.map(({ label }) => label.toString())
+    ).toEqual(['init_value']);
+  });
+
+  it('has the latest compatible version number', (): void => {
+    expect(latest.version.toString()).toEqual('4');
+  });
+});
+
+describe('v2ToLatestCompatible', (): void => {
+  const registry = new TypeRegistry();
+  const contract = registry.createType('ContractMetadata', { V2: abis['ink_v2_flipper']['V2'] });
+  const latest = v2ToLatestCompatible(registry, contract.asV2);
+
+  it('has the correct constructor flag', (): void => {
+    expect(
+      latest.spec.constructors[0].payable.isTrue
+    ).toEqual(true);
+  });
+
+  it('has the latest compatible version number', (): void => {
+    expect(latest.version.toString()).toEqual('4');
+  });
+});
+
+describe('v3ToLatestCompatible', (): void => {
+  const registry = new TypeRegistry();
+  const contract = registry.createType('ContractMetadata', { V3: abis['ink_v3_flipper']['V3'] });
+  const latest = v3ToLatestCompatible(registry, contract.asV3);
+
+  it('has the correct constructor flags', (): void => {
+    expect(
+      latest.spec.constructors[0].payable.isTrue
+    ).toEqual(false);
+    expect(
+      latest.spec.constructors[1].payable.isTrue
+    ).toEqual(true);
+  });
+
+  it('has the correct messages', (): void => {
+    const contract = registry.createType('ContractMetadata', { V3: abis['ink_v3_traitErc20']['V3'] });
+    const latest = v3ToLatestCompatible(registry, contract.asV3);
+
+    expect(
+      latest.spec.messages.map(({ label }) => label.toString())
+    ).toEqual([
+      'BaseErc20::total_supply', 'BaseErc20::balance_of', 'BaseErc20::allowance', 'BaseErc20::transfer', 'BaseErc20::approve', 'BaseErc20::transfer_from'
+    ]);
+  });
+
+  it('has the latest compatible version number', (): void => {
+    expect(latest.version.toString()).toEqual('4');
+  });
+});
+
+describe('v4ToLatestCompatible', (): void => {
+  const registry = new TypeRegistry();
+  const contract = registry.createType('ContractMetadata', { V4: abis['ink_v4_flipperContract'] });
+  const latest = v4ToLatestCompatible(registry, contract.asV4);
+
+  it('has the correct constructor flags', (): void => {
+    expect(
+      latest.spec.constructors[0].payable.isTrue
+    ).toEqual(false);
+    expect(
+      latest.spec.constructors[1].payable.isTrue
+    ).toEqual(false);
+  });
+
+  it('has the latest compatible version number', (): void => {
+    expect(latest.version.toString()).toEqual('4');
+  });
+});
+
+describe('v5ToLatestCompatible', (): void => {
+  const registry = new TypeRegistry();
+  const contract = registry.createType('ContractMetadata', { V5: abis['ink_v5_erc20Metadata'] });
+  const latest = v5ToLatestCompatible(registry, contract.asV5);
+
+  it('has the correct messages', (): void => {
+    expect(
+      latest.spec.messages.map(({ label }) => label.toString())
+    ).toEqual(['total_supply', 'balance_of', 'allowance', 'transfer', 'approve', 'transfer_from']);
+  });
+
+  it('has new event fields', (): void => {
+    expect(
+      latest.spec.events.length
+    ).toEqual(2);
+
+    expect(
+      latest.spec.events.every((e) => e.has('module_path'))
+    ).toEqual(true);
+
+    expect(latest.spec.events[0].module_path.toString()).toEqual('erc20::erc20');
+
+    expect(
+      latest.spec.events.every((e) => e.has('signature_topic'))
+    ).toEqual(true);
+
+    expect(latest.spec.events[0].signature_topic.toHex()).toEqual('0xb5b61a3e6a21a16be4f044b517c28ac692492f73c5bfd3f60178ad98c767f4cb');
+  });
+
+  it('has the latest compatible version number', (): void => {
+    expect(latest.version.toString()).toEqual('5');
+  });
+});
+
+describe('v6ToLatestCompatible', (): void => {
+  const registry = new TypeRegistry();
+  const contract = registry.createType('ContractMetadata', { V6: abis['ink_v6_erc20Metadata'] });
+  const latest = v6ToLatestCompatible(registry, contract.asV6);
+
+  it('has the correct messages', (): void => {
+    expect(
+      latest.spec.messages.map(({ label }) => label.toString())
+    ).toEqual(['total_supply', 'balance_of', 'allowance', 'transfer', 'approve', 'transfer_from']);
+  });
+
+  it('has H160 as the type of balance_of argument', (): void => {
+    const arg = latest.spec.messages.find(
+      (m) => m.label.toString() === 'balance_of'
+    )?.args[0];
+
+    const name = arg?.type.displayName?.[0]?.toString();
+
+    expect(name).toBe('H160');
+  });
+
+  it('has the latest compatible version number', (): void => {
+    expect(latest.version.toString()).toEqual('6');
+  });
+});

packages/api-contract/src/Abi/toLatestCompatible.ts

@@ -0,0 +1,52 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ContractMetadataV4, ContractMetadataV5, ContractMetadataV6 } from '@pezkuwi/types/interfaces';
+import type { Registry } from '@pezkuwi/types/types';
+import type { ContractMetadataSupported } from './index.js';
+
+import { v0ToV1 } from './toV1.js';
+import { v1ToV2 } from './toV2.js';
+import { v2ToV3 } from './toV3.js';
+import { v3ToV4 } from './toV4.js';
+
+// The versions where an enum is used, aka V0 is missing
+// (Order from newest, i.e. we expect more on newest vs oldest)
+export const enumVersions = ['V6', 'V5', 'V4', 'V3', 'V2', 'V1'] as const;
+
+type Versions = typeof enumVersions[number] | 'V0';
+
+type Converter = (registry: Registry, vx: any) => ContractMetadataSupported;
+
+// Helper to convert metadata from one step to the next
+function createConverter <I, O> (next: (registry: Registry, input: O) => ContractMetadataSupported, step: (registry: Registry, input: I) => O): (registry: Registry, input: I) => ContractMetadataSupported {
+  return (registry: Registry, input: I): ContractMetadataSupported =>
+    next(registry, step(registry, input));
+}
+
+export function v6ToLatestCompatible (_registry: Registry, v6: ContractMetadataV6): ContractMetadataV6 {
+  return v6;
+}
+
+export function v5ToLatestCompatible (_registry: Registry, v5: ContractMetadataV5): ContractMetadataV5 {
+  return v5;
+}
+
+export function v4ToLatestCompatible (_registry: Registry, v4: ContractMetadataV4): ContractMetadataV4 {
+  return v4;
+}
+
+export const v3ToLatestCompatible = /*#__PURE__*/ createConverter(v4ToLatestCompatible, v3ToV4);
+export const v2ToLatestCompatible = /*#__PURE__*/ createConverter(v3ToLatestCompatible, v2ToV3);
+export const v1ToLatestCompatible = /*#__PURE__*/ createConverter(v2ToLatestCompatible, v1ToV2);
+export const v0ToLatestCompatible = /*#__PURE__*/ createConverter(v1ToLatestCompatible, v0ToV1);
+
+export const convertVersions: [Versions, Converter][] = [
+  ['V6', v6ToLatestCompatible],
+  ['V5', v5ToLatestCompatible],
+  ['V4', v4ToLatestCompatible],
+  ['V3', v3ToLatestCompatible],
+  ['V2', v2ToLatestCompatible],
+  ['V1', v1ToLatestCompatible],
+  ['V0', v0ToLatestCompatible]
+];

packages/api-contract/src/Abi/toV1.ts

@@ -0,0 +1,35 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ContractMetadataV0, ContractMetadataV1 } from '@pezkuwi/types/interfaces';
+import type { Registry } from '@pezkuwi/types/types';
+
+import { convertSiV0toV1 } from '@pezkuwi/types';
+import { objectSpread } from '@pezkuwi/util';
+
+interface Named {
+  name: unknown;
+}
+
+function v0ToV1Names (all: Named[]): unknown[] {
+  return all.map((e) =>
+    objectSpread({}, e, {
+      name: Array.isArray(e.name)
+        ? e.name
+        : [e.name]
+    }));
+}
+
+export function v0ToV1 (registry: Registry, v0: ContractMetadataV0): ContractMetadataV1 {
+  if (!v0.metadataVersion.length) {
+    throw new Error('Invalid format for V0 (detected) contract metadata');
+  }
+
+  return registry.createType('ContractMetadataV1', objectSpread({}, v0, {
+    spec: objectSpread({}, v0.spec, {
+      constructors: v0ToV1Names(v0.spec.constructors),
+      messages: v0ToV1Names(v0.spec.messages)
+    }),
+    types: convertSiV0toV1(registry, v0.types)
+  }));
+}

packages/api-contract/src/Abi/toV2.ts

@@ -0,0 +1,58 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { Text } from '@pezkuwi/types';
+import type { ContractConstructorSpecV0, ContractEventSpecV0, ContractMessageSpecV0, ContractMetadataV1, ContractMetadataV2 } from '@pezkuwi/types/interfaces';
+import type { Registry } from '@pezkuwi/types/types';
+
+import { objectSpread } from '@pezkuwi/util';
+
+type WithArgs = keyof typeof ARG_TYPES;
+
+interface NamedEntry {
+  name: Text | Text[];
+}
+
+type GetArgsType<T extends WithArgs> = T extends 'ContractConstructorSpec'
+  ? ContractConstructorSpecV0
+  : T extends ContractEventSpecV0
+    ? ContractEventSpecV0
+    : ContractMessageSpecV0;
+
+interface ArgsEntry <T extends WithArgs> extends NamedEntry {
+  args: GetArgsType<T>['args'][0][];
+}
+
+const ARG_TYPES = {
+  ContractConstructorSpec: 'ContractMessageParamSpecV2',
+  ContractEventSpec: 'ContractEventParamSpecV2',
+  ContractMessageSpec: 'ContractMessageParamSpecV2'
+} as const;
+
+function v1ToV2Label (entry: NamedEntry): { label: Text } {
+  return objectSpread({}, entry, {
+    label: Array.isArray(entry.name)
+      ? entry.name.join('::')
+      : entry.name
+  });
+}
+
+function v1ToV2Labels <T extends WithArgs> (registry: Registry, outType: T, all: ArgsEntry<T>[]): unknown[] {
+  return all.map((e) =>
+    registry.createType(`${outType}V2`, objectSpread(v1ToV2Label(e), {
+      args: e.args.map((a) =>
+        registry.createType(ARG_TYPES[outType], v1ToV2Label(a))
+      )
+    }))
+  );
+}
+
+export function v1ToV2 (registry: Registry, v1: ContractMetadataV1): ContractMetadataV2 {
+  return registry.createType('ContractMetadataV2', objectSpread({}, v1, {
+    spec: objectSpread({}, v1.spec, {
+      constructors: v1ToV2Labels(registry, 'ContractConstructorSpec', v1.spec.constructors),
+      events: v1ToV2Labels(registry, 'ContractEventSpec', v1.spec.events),
+      messages: v1ToV2Labels(registry, 'ContractMessageSpec', v1.spec.messages)
+    })
+  }));
+}

packages/api-contract/src/Abi/toV3.ts

@@ -0,0 +1,18 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ContractMetadataV2, ContractMetadataV3 } from '@pezkuwi/types/interfaces';
+import type { Registry } from '@pezkuwi/types/types';
+
+import { objectSpread } from '@pezkuwi/util';
+
+export function v2ToV3 (registry: Registry, v2: ContractMetadataV2): ContractMetadataV3 {
+  return registry.createType('ContractMetadataV3', objectSpread({}, v2, {
+    spec: objectSpread({}, v2.spec, {
+      constructors: v2.spec.constructors.map((c) =>
+        // V3 introduces the payable flag on constructors, for <V3, it is always true
+        registry.createType('ContractConstructorSpecV3', objectSpread({}, c, { payable: true }))
+      )
+    })
+  }));
+}

packages/api-contract/src/Abi/toV4.ts

@@ -0,0 +1,21 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ContractMetadataV3, ContractMetadataV4 } from '@pezkuwi/types/interfaces';
+import type { Registry } from '@pezkuwi/types/types';
+
+import { objectSpread } from '@pezkuwi/util';
+
+export function v3ToV4 (registry: Registry, v3: ContractMetadataV3): ContractMetadataV4 {
+  return registry.createType('ContractMetadataV4', objectSpread({}, v3, {
+    spec: objectSpread({}, v3.spec, {
+      constructors: v3.spec.constructors.map((c) =>
+        registry.createType('ContractConstructorSpecV4', objectSpread({}, c))
+      ),
+      messages: v3.spec.messages.map((m) =>
+        registry.createType('ContractMessageSpecV3', objectSpread({}, m))
+      )
+    }),
+    version: registry.createType('Text', '4')
+  }));
+}

packages/api-contract/src/augment.ts

@@ -0,0 +1,4 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import '@pezkuwi/api-augment';

packages/api-contract/src/base/Base.ts

@@ -0,0 +1,52 @@
+// Copyright 2017-2025 @pezkuwi/api authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ApiBase } from '@pezkuwi/api/base';
+import type { ApiTypes, DecorateMethod } from '@pezkuwi/api/types';
+import type { WeightV2 } from '@pezkuwi/types/interfaces';
+import type { Registry } from '@pezkuwi/types/types';
+
+import { isFunction } from '@pezkuwi/util';
+
+import { Abi } from '../Abi/index.js';
+
+export abstract class Base<ApiType extends ApiTypes> {
+  readonly abi: Abi;
+  readonly api: ApiBase<ApiType>;
+
+  protected readonly _decorateMethod: DecorateMethod<ApiType>;
+  protected readonly _isWeightV1: boolean;
+  protected readonly _isRevive: boolean;
+
+  constructor (api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, decorateMethod: DecorateMethod<ApiType>) {
+    if (!api || !api.isConnected || !api.tx) {
+      throw new Error('Your API has not been initialized correctly and is not connected to a chain');
+    }
+
+    this.abi = abi instanceof Abi
+      ? abi
+      : new Abi(abi, api.registry.getChainProperties());
+    this.api = api;
+    this._decorateMethod = decorateMethod;
+    this._isWeightV1 = !api.registry.createType<WeightV2>('Weight').proofSize;
+    this._isRevive = this.abi.isRevive;
+
+    if (this._isRevive) {
+      if (!api.tx.revive || !isFunction(api.tx.revive.instantiateWithCode) || api.tx.revive.instantiateWithCode.meta.args.length !== 6) {
+        throw new Error('The runtime does not expose api.tx.revive.instantiateWithCode with storageDepositLimit');
+      } else if (!api.call.reviveApi || !isFunction(api.call.reviveApi.call)) {
+        throw new Error('Your runtime does not expose the api.call.reviveApi.call runtime interfaces');
+      }
+    } else {
+      if (!api.tx.contracts || !isFunction(api.tx.contracts.instantiateWithCode) || api.tx.contracts.instantiateWithCode.meta.args.length !== 6) {
+        throw new Error('The runtime does not expose api.tx.contracts.instantiateWithCode with storageDepositLimit');
+      } else if (!api.call.contractsApi || !isFunction(api.call.contractsApi.call)) {
+        throw new Error('Your runtime does not expose the api.call.contractsApi.call runtime interfaces');
+      }
+    }
+  }
+
+  public get registry (): Registry {
+    return this.api.registry;
+  }
+}

packages/api-contract/src/base/Blueprint.ts

@@ -0,0 +1,90 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ApiBase } from '@pezkuwi/api/base';
+import type { SubmittableExtrinsic } from '@pezkuwi/api/submittable/types';
+import type { ApiTypes, DecorateMethod } from '@pezkuwi/api/types';
+import type { AccountId, EventRecord, Hash } from '@pezkuwi/types/interfaces';
+import type { ISubmittableResult } from '@pezkuwi/types/types';
+import type { Abi } from '../Abi/index.js';
+import type { AbiConstructor, BlueprintOptions } from '../types.js';
+import type { MapConstructorExec } from './types.js';
+
+import { SubmittableResult } from '@pezkuwi/api';
+import { BN_ZERO, isUndefined } from '@pezkuwi/util';
+
+import { applyOnEvent } from '../util.js';
+import { Base } from './Base.js';
+import { Contract } from './Contract.js';
+import { convertWeight, createBluePrintTx, encodeSalt } from './util.js';
+
+export type BlueprintConstructor<ApiType extends ApiTypes> = new(api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, codeHash: string | Hash | Uint8Array) => Blueprint<ApiType>;
+
+export class BlueprintSubmittableResult<ApiType extends ApiTypes> extends SubmittableResult {
+  readonly contract?: Contract<ApiType> | undefined;
+
+  constructor (result: ISubmittableResult, contract?: Contract<ApiType>) {
+    super(result);
+
+    this.contract = contract;
+  }
+}
+
+export class Blueprint<ApiType extends ApiTypes> extends Base<ApiType> {
+  /**
+   * @description The on-chain code hash for this blueprint
+   */
+  readonly codeHash: Hash;
+
+  readonly #tx: MapConstructorExec<ApiType> = {};
+
+  constructor (api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, codeHash: string | Hash | Uint8Array, decorateMethod: DecorateMethod<ApiType>) {
+    super(api, abi, decorateMethod);
+
+    this.codeHash = this.registry.createType('Hash', codeHash);
+
+    this.abi.constructors.forEach((c): void => {
+      if (isUndefined(this.#tx[c.method])) {
+        this.#tx[c.method] = createBluePrintTx(c, (o, p) => this.#deploy(c, o, p));
+      }
+    });
+  }
+
+  public get tx (): MapConstructorExec<ApiType> {
+    return this.#tx;
+  }
+
+  #deploy = (constructorOrId: AbiConstructor | string | number, { gasLimit = BN_ZERO, salt, storageDepositLimit = null, value = BN_ZERO }: BlueprintOptions, params: unknown[]): SubmittableExtrinsic<ApiType, BlueprintSubmittableResult<ApiType>> => {
+    const palletTx = this._isRevive
+      ? this.api.tx.revive
+      : this.api.tx.contracts;
+
+    return palletTx.instantiate(
+      value,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore jiggle v1 weights, metadata points to latest
+      this._isWeightV1
+        ? convertWeight(gasLimit).v1Weight
+        : convertWeight(gasLimit).v2Weight,
+      storageDepositLimit,
+      this.codeHash,
+      this.abi.findConstructor(constructorOrId).toU8a(params),
+      encodeSalt(salt)
+    ).withResultTransform((result: ISubmittableResult) =>
+      new BlueprintSubmittableResult(result, applyOnEvent(result, ['Instantiated'], ([record]: EventRecord[]) =>
+        new Contract<ApiType>(this.api, this.abi, record.event.data[1] as AccountId, this._decorateMethod), this._isRevive
+      )
+      )
+    );
+  };
+}
+
+export function extendBlueprint <ApiType extends ApiTypes> (type: ApiType, decorateMethod: DecorateMethod<ApiType>): BlueprintConstructor<ApiType> {
+  return class extends Blueprint<ApiType> {
+    static __BlueprintType = type;
+
+    constructor (api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, codeHash: string | Hash | Uint8Array) {
+      super(api, abi, codeHash, decorateMethod);
+    }
+  };
+}

packages/api-contract/src/base/Code.spec.ts

@@ -0,0 +1,47 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@pezkuwi/dev-test/globals.d.ts" />
+
+import fs from 'node:fs';
+
+import { toPromiseMethod } from '@pezkuwi/api';
+
+import v0contractFlipper from '../test/contracts/ink/v0/flipper.contract.json' assert { type: 'json' };
+import v0abiFlipper from '../test/contracts/ink/v0/flipper.json' assert { type: 'json' };
+import v1contractFlipper from '../test/contracts/ink/v1/flipper.contract.json' assert { type: 'json' };
+import v6contractErc20 from '../test/contracts/ink/v6/erc20.contract.json' assert { type: 'json' };
+import { Code } from './Code.js';
+import { mockApi, mockReviveApi } from './mock.js';
+
+const v0wasmFlipper = fs.readFileSync(new URL('../test/contracts/ink/v0/flipper.wasm', import.meta.url), 'utf-8');
+
+describe('Code', (): void => {
+  it('can construct with an individual ABI/WASM combo', (): void => {
+    expect(
+      () => new Code(mockApi, v0abiFlipper as Record<string, unknown>, v0wasmFlipper, toPromiseMethod)
+    ).not.toThrow();
+  });
+
+  it('can construct with an .contract ABI (v0)', (): void => {
+    expect(
+      () => new Code(mockApi, v0contractFlipper as Record<string, unknown>, null, toPromiseMethod)
+    ).not.toThrow();
+  });
+
+  it('can construct with an .contract ABI (v1)', (): void => {
+    expect(
+      () => new Code(mockApi, v1contractFlipper as Record<string, unknown>, null, toPromiseMethod)
+    ).not.toThrow();
+  });
+
+  it('can construct a revive compatible contract (v6)', (): void => {
+    expect(
+      () => new Code(mockApi, v6contractErc20 as Record<string, unknown>, null, toPromiseMethod)
+    ).toThrow('The runtime does not expose api.tx.revive.instantiateWithCode with storageDepositLimit');
+
+    expect(
+      () => new Code(mockReviveApi, v6contractErc20 as Record<string, unknown>, null, toPromiseMethod)
+    ).not.toThrow();
+  });
+});

packages/api-contract/src/base/Code.ts

@@ -0,0 +1,142 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ApiBase } from '@pezkuwi/api/base';
+import type { SubmittableExtrinsic } from '@pezkuwi/api/submittable/types';
+import type { ApiTypes, DecorateMethod } from '@pezkuwi/api/types';
+import type { AccountId, EventRecord } from '@pezkuwi/types/interfaces';
+import type { ISubmittableResult } from '@pezkuwi/types/types';
+import type { Codec } from '@pezkuwi/types-codec/types';
+import type { Abi } from '../Abi/index.js';
+import type { AbiConstructor, BlueprintOptions } from '../types.js';
+import type { MapConstructorExec } from './types.js';
+
+import { SubmittableResult } from '@pezkuwi/api';
+import { BN_ZERO, compactAddLength, isRiscV, isUndefined, isWasm, u8aToU8a } from '@pezkuwi/util';
+
+import { applyOnEvent } from '../util.js';
+import { Base } from './Base.js';
+import { Blueprint } from './Blueprint.js';
+import { Contract } from './Contract.js';
+import { convertWeight, createBluePrintTx, encodeSalt } from './util.js';
+
+export type CodeConstructor<ApiType extends ApiTypes> = new(api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, wasm: Uint8Array | string | Buffer | null | undefined) => Code<ApiType>;
+
+export class CodeSubmittableResult<ApiType extends ApiTypes> extends SubmittableResult {
+  readonly blueprint?: Blueprint<ApiType> | undefined;
+  readonly contract?: Contract<ApiType> | undefined;
+
+  constructor (result: ISubmittableResult, blueprint?: Blueprint<ApiType> | undefined, contract?: Contract<ApiType> | undefined) {
+    super(result);
+
+    this.blueprint = blueprint;
+    this.contract = contract;
+  }
+}
+
+// checks to see if the code (or at least the header)
+// is a valid/supported format
+function isValidCode (code: Uint8Array): boolean {
+  return isWasm(code) || isRiscV(code);
+}
+
+export class Code<ApiType extends ApiTypes> extends Base<ApiType> {
+  readonly code: Uint8Array;
+
+  readonly #tx: MapConstructorExec<ApiType> = {};
+
+  constructor (api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, wasm: Uint8Array | string | Buffer | null | undefined, decorateMethod: DecorateMethod<ApiType>) {
+    super(api, abi, decorateMethod);
+
+    this.code = isValidCode(this.abi.info.source.wasm)
+      ? this.abi.info.source.wasm
+      : u8aToU8a(wasm);
+
+    if (!isValidCode(this.code)) {
+      throw new Error('Invalid code provided');
+    }
+
+    this.abi.constructors.forEach((c): void => {
+      if (isUndefined(this.#tx[c.method])) {
+        this.#tx[c.method] = createBluePrintTx(c, (o, p) => this.#instantiate(c, o, p));
+      }
+    });
+  }
+
+  public get tx (): MapConstructorExec<ApiType> {
+    return this.#tx;
+  }
+
+  #instantiate = (constructorOrId: AbiConstructor | string | number, { gasLimit = BN_ZERO, salt, storageDepositLimit = null, value = BN_ZERO }: BlueprintOptions, params: unknown[]): SubmittableExtrinsic<ApiType, CodeSubmittableResult<ApiType>> => {
+    const palletTx = this._isRevive ? this.api.tx.revive : this.api.tx.contracts;
+
+    if (this._isRevive) {
+      return palletTx.instantiateWithCode(
+        value,
+        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+        // @ts-ignore jiggle v1 weights, metadata points to latest
+        this._isWeightV1
+          ? convertWeight(gasLimit).v1Weight
+          : convertWeight(gasLimit).v2Weight,
+        storageDepositLimit,
+        compactAddLength(this.code),
+        this.abi.findConstructor(constructorOrId).toU8a(params),
+        encodeSalt(salt)
+      ).withResultTransform((result: ISubmittableResult) =>
+        new CodeSubmittableResult(
+          result,
+          ...(applyOnEvent(result, ['Instantiated'], (records: EventRecord[]) =>
+            records.reduce<[Blueprint<ApiType> | undefined, Contract<ApiType> | undefined]>(
+              ([blueprint, contract], { event }) =>
+                this.api.events.revive['Instantiated'].is(event)
+                  ? [
+                    blueprint,
+                    new Contract<ApiType>(
+                      this.api,
+                      this.abi,
+                      (event as unknown as { data: [Codec, AccountId] }).data[1],
+                      this._decorateMethod
+                    )
+                  ]
+                  : [blueprint, contract],
+              [undefined, undefined]
+            ), this._isRevive
+          ) || [undefined, undefined])
+        )
+      );
+    }
+
+    return palletTx.instantiateWithCode(
+      value,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore jiggle v1 weights, metadata points to latest
+      this._isWeightV1
+        ? convertWeight(gasLimit).v1Weight
+        : convertWeight(gasLimit).v2Weight,
+      storageDepositLimit,
+      compactAddLength(this.code),
+      this.abi.findConstructor(constructorOrId).toU8a(params),
+      encodeSalt(salt)
+    ).withResultTransform((result: ISubmittableResult) =>
+      new CodeSubmittableResult(result, ...(applyOnEvent(result, ['CodeStored', 'Instantiated'], (records: EventRecord[]) =>
+        records.reduce<[Blueprint<ApiType> | undefined, Contract<ApiType> | undefined]>(([blueprint, contract], { event }) =>
+          this.api.events.contracts.Instantiated.is(event)
+            ? [blueprint, new Contract<ApiType>(this.api, this.abi, (event as unknown as { data: [Codec, AccountId] }).data[1], this._decorateMethod)]
+            : this.api.events.contracts.CodeStored.is(event)
+              ? [new Blueprint<ApiType>(this.api, this.abi, (event as unknown as { data: [AccountId] }).data[0], this._decorateMethod), contract]
+              : [blueprint, contract],
+        [undefined, undefined]), this._isRevive
+      ) || [undefined, undefined]))
+    );
+  };
+}
+
+export function extendCode <ApiType extends ApiTypes> (type: ApiType, decorateMethod: DecorateMethod<ApiType>): CodeConstructor<ApiType> {
+  return class extends Code<ApiType> {
+    static __CodeType = type;
+
+    constructor (api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, wasm: Uint8Array | string | Buffer | null | undefined) {
+      super(api, abi, wasm, decorateMethod);
+    }
+  };
+}

packages/api-contract/src/base/Contract.ts

@@ -0,0 +1,197 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ApiBase } from '@pezkuwi/api/base';
+import type { SubmittableExtrinsic } from '@pezkuwi/api/submittable/types';
+import type { ApiTypes, DecorateMethod } from '@pezkuwi/api/types';
+import type { AccountId, AccountId20, ContractExecResult, EventRecord, Weight, WeightV2 } from '@pezkuwi/types/interfaces';
+import type { ISubmittableResult } from '@pezkuwi/types/types';
+import type { Abi } from '../Abi/index.js';
+import type { AbiMessage, ContractCallOutcome, ContractOptions, DecodedEvent, WeightAll } from '../types.js';
+import type { ContractCallResult, ContractCallSend, ContractQuery, ContractTx, MapMessageQuery, MapMessageTx } from './types.js';
+
+import { map } from 'rxjs';
+
+import { SubmittableResult } from '@pezkuwi/api';
+import { BN, BN_HUNDRED, BN_ONE, BN_ZERO, isUndefined, logger } from '@pezkuwi/util';
+
+import { applyOnEvent } from '../util.js';
+import { Base } from './Base.js';
+import { convertWeight, withMeta } from './util.js';
+
+export type ContractConstructor<ApiType extends ApiTypes> = new(api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, address: string | AccountId) => Contract<ApiType>;
+
+// As per Rust, 5 * GAS_PER_SEC
+const MAX_CALL_GAS = new BN(5_000_000_000_000).isub(BN_ONE);
+
+const l = logger('Contract');
+
+function createQuery <ApiType extends ApiTypes> (meta: AbiMessage, fn: (origin: string | AccountId | Uint8Array, options: ContractOptions, params: unknown[]) => ContractCallResult<ApiType, ContractCallOutcome>): ContractQuery<ApiType> {
+  return withMeta(meta, (origin: string | AccountId | Uint8Array, options: ContractOptions, ...params: unknown[]): ContractCallResult<ApiType, ContractCallOutcome> =>
+    fn(origin, options, params)
+  );
+}
+
+function createTx <ApiType extends ApiTypes> (meta: AbiMessage, fn: (options: ContractOptions, params: unknown[]) => SubmittableExtrinsic<ApiType>): ContractTx<ApiType> {
+  return withMeta(meta, (options: ContractOptions, ...params: unknown[]): SubmittableExtrinsic<ApiType> =>
+    fn(options, params)
+  );
+}
+
+export class ContractSubmittableResult extends SubmittableResult {
+  readonly contractEvents?: DecodedEvent[] | undefined;
+
+  constructor (result: ISubmittableResult, contractEvents?: DecodedEvent[]) {
+    super(result);
+
+    this.contractEvents = contractEvents;
+  }
+}
+
+export class Contract<ApiType extends ApiTypes> extends Base<ApiType> {
+  /**
+   * @description The on-chain address for this contract
+   */
+  readonly address: AccountId | AccountId20;
+
+  readonly #query: MapMessageQuery<ApiType> = {};
+  readonly #tx: MapMessageTx<ApiType> = {};
+
+  constructor (api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, address: string | AccountId | AccountId20, decorateMethod: DecorateMethod<ApiType>) {
+    super(api, abi, decorateMethod);
+
+    this.address = this.registry.createType(this._isRevive ? 'AccountId20' : 'AccountId', address);
+
+    this.abi.messages.forEach((m): void => {
+      if (isUndefined(this.#tx[m.method])) {
+        this.#tx[m.method] = createTx(m, (o, p) => this.#exec(m, o, p));
+      }
+
+      if (isUndefined(this.#query[m.method])) {
+        this.#query[m.method] = createQuery(m, (f, o, p) => this.#read(m, o, p).send(f));
+      }
+    });
+  }
+
+  public get query (): MapMessageQuery<ApiType> {
+    return this.#query;
+  }
+
+  public get tx (): MapMessageTx<ApiType> {
+    return this.#tx;
+  }
+
+  #getGas = (_gasLimit: bigint | BN | string | number | WeightV2, isCall = false): WeightAll => {
+    const weight = convertWeight(_gasLimit);
+
+    if (weight.v1Weight.gt(BN_ZERO)) {
+      return weight;
+    }
+
+    return convertWeight(
+      isCall
+        ? MAX_CALL_GAS
+        : convertWeight(
+          this.api.consts.system.blockWeights
+            ? (this.api.consts.system.blockWeights as unknown as { maxBlock: WeightV2 }).maxBlock
+            : this.api.consts.system['maximumBlockWeight'] as Weight
+        ).v1Weight.muln(64).div(BN_HUNDRED)
+    );
+  };
+
+  #exec = (messageOrId: AbiMessage | string | number, { gasLimit = BN_ZERO, storageDepositLimit = null, value = BN_ZERO }: ContractOptions, params: unknown[]): SubmittableExtrinsic<ApiType> => {
+    const palletTx = this._isRevive ? this.api.tx.revive : this.api.tx.contracts;
+
+    return palletTx.call(
+      this.address,
+      value,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore jiggle v1 weights, metadata points to latest
+      this._isWeightV1
+        ? convertWeight(gasLimit).v1Weight
+        : convertWeight(gasLimit).v2Weight,
+      storageDepositLimit,
+      this.abi.findMessage(messageOrId).toU8a(params)
+    ).withResultTransform((result: ISubmittableResult) =>
+      // ContractEmitted is the current generation, ContractExecution is the previous generation
+      new ContractSubmittableResult(result, applyOnEvent(result, ['ContractEmitted', 'ContractExecution'], (records: EventRecord[]) =>
+        records
+          // Filter to only decode events emitted by this specific contract instance.
+          .filter((record): boolean => {
+            try {
+              const contractAddress = record.event.data[0];
+
+              if (this.address.eq(contractAddress)) {
+                return true;
+              }
+
+              l.debug(`Skipping event from different contract ${contractAddress.toString()} (this contract: ${this.address.toString()})`);
+
+              return false;
+            } catch (error) {
+              l.warn(`Unable to extract contract address from event: ${(error as Error).message}`);
+
+              return false;
+            }
+          })
+          .map((record): DecodedEvent | null => {
+            try {
+              return this.abi.decodeEvent(record);
+            } catch (error) {
+              l.error(`Unable to decode contract event: ${(error as Error).message}`);
+
+              return null;
+            }
+          })
+          .filter((decoded): decoded is DecodedEvent => !!decoded), this._isRevive
+      ))
+    );
+  };
+
+  #read = (messageOrId: AbiMessage | string | number, { gasLimit = BN_ZERO, storageDepositLimit = null, value = BN_ZERO }: ContractOptions, params: unknown[]): ContractCallSend<ApiType> => {
+    const message = this.abi.findMessage(messageOrId);
+
+    return {
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+      send: this._decorateMethod((origin: string | AccountId | Uint8Array) =>
+        (this._isRevive
+          ? this.api.rx.call.reviveApi.call
+          : this.api.rx.call.contractsApi.call)<ContractExecResult>(
+          origin,
+          this.address,
+          value,
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          // @ts-ignore jiggle v1 weights, metadata points to latest
+          this._isWeightV1
+            ? this.#getGas(gasLimit, true).v1Weight
+            : this.#getGas(gasLimit, true).v2Weight,
+          storageDepositLimit,
+          message.toU8a(params)
+        ).pipe(
+          map(({ debugMessage, gasConsumed, gasRequired, result, storageDeposit }): ContractCallOutcome => ({
+            debugMessage,
+            gasConsumed,
+            gasRequired: gasRequired && !convertWeight(gasRequired).v1Weight.isZero()
+              ? gasRequired
+              : gasConsumed,
+            output: result.isOk && message.returnType
+              ? this.abi.registry.createTypeUnsafe(message.returnType.lookupName || message.returnType.type, [result.asOk.data.toU8a(true)], { isPedantic: true })
+              : null,
+            result,
+            storageDeposit
+          }))
+        )
+      )
+    };
+  };
+}
+
+export function extendContract <ApiType extends ApiTypes> (type: ApiType, decorateMethod: DecorateMethod<ApiType>): ContractConstructor<ApiType> {
+  return class extends Contract<ApiType> {
+    static __ContractType = type;
+
+    constructor (api: ApiBase<ApiType>, abi: string | Record<string, unknown> | Abi, address: string | AccountId) {
+      super(api, abi, address, decorateMethod);
+    }
+  };
+}

packages/api-contract/src/base/index.ts

@@ -0,0 +1,6 @@
+// Copyright 2017-2025 @pezkuwi/api authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export { Blueprint, BlueprintSubmittableResult, extendBlueprint } from './Blueprint.js';
+export { Code, CodeSubmittableResult, extendCode } from './Code.js';
+export { Contract, extendContract } from './Contract.js';

packages/api-contract/src/base/mock.ts

@@ -0,0 +1,48 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ApiBase } from '@pezkuwi/api/base';
+
+import { TypeRegistry } from '@pezkuwi/types';
+
+const registry = new TypeRegistry();
+
+const instantiateWithCode = (): never => {
+  throw new Error('mock');
+};
+
+instantiateWithCode.meta = { args: new Array(6) };
+
+export const mockApi = {
+  call: {
+    contractsApi: {
+      call: (): never => {
+        throw new Error('mock');
+      }
+    }
+  },
+  isConnected: true,
+  registry,
+  tx: {
+    contracts: {
+      instantiateWithCode
+    }
+  }
+} as unknown as ApiBase<'promise'>;
+
+export const mockReviveApi = {
+  call: {
+    reviveApi: {
+      call: (): never => {
+        throw new Error('mock');
+      }
+    }
+  },
+  isConnected: true,
+  registry,
+  tx: {
+    revive: {
+      instantiateWithCode
+    }
+  }
+} as unknown as ApiBase<'promise'>;

packages/api-contract/src/base/types.ts

@@ -0,0 +1,40 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { Observable } from 'rxjs';
+import type { SubmittableExtrinsic } from '@pezkuwi/api/submittable/types';
+import type { ApiTypes, ObsInnerType } from '@pezkuwi/api/types';
+import type { AccountId } from '@pezkuwi/types/interfaces';
+import type { AbiMessage, BlueprintOptions, ContractCallOutcome, ContractOptions } from '../types.js';
+
+export interface MessageMeta {
+  readonly meta: AbiMessage;
+}
+
+export interface BlueprintDeploy<ApiType extends ApiTypes> extends MessageMeta {
+  (options: BlueprintOptions, ...params: unknown[]): SubmittableExtrinsic<ApiType>;
+}
+
+export interface ContractQuery<ApiType extends ApiTypes> extends MessageMeta {
+  (origin: AccountId | string | Uint8Array, options: ContractOptions, ...params: unknown[]): ContractCallResult<ApiType, ContractCallOutcome>;
+}
+
+export interface ContractTx<ApiType extends ApiTypes> extends MessageMeta {
+  (options: ContractOptions, ...params: unknown[]): SubmittableExtrinsic<ApiType>;
+}
+
+export type ContractGeneric<O, T> = (messageOrId: AbiMessage | string | number, options: O, ...params: unknown[]) => T;
+
+export type ContractCallResult<ApiType extends ApiTypes, T> = ApiType extends 'rxjs'
+  ? Observable<T>
+  : Promise<ObsInnerType<Observable<T>>>;
+
+export interface ContractCallSend<ApiType extends ApiTypes> {
+  send (account: string | AccountId | Uint8Array): ContractCallResult<ApiType, ContractCallOutcome>;
+}
+
+export type MapConstructorExec<ApiType extends ApiTypes> = Record<string, BlueprintDeploy<ApiType>>;
+
+export type MapMessageTx<ApiType extends ApiTypes> = Record<string, ContractTx<ApiType>>;
+
+export type MapMessageQuery<ApiType extends ApiTypes> = Record<string, ContractQuery<ApiType>>;

packages/api-contract/src/base/util.ts

@@ -0,0 +1,56 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { SubmittableResult } from '@pezkuwi/api';
+import type { SubmittableExtrinsic } from '@pezkuwi/api/submittable/types';
+import type { ApiTypes } from '@pezkuwi/api/types';
+import type { WeightV1, WeightV2 } from '@pezkuwi/types/interfaces';
+import type { BN } from '@pezkuwi/util';
+import type { AbiConstructor, AbiMessage, BlueprintOptions, WeightAll } from '../types.js';
+import type { BlueprintDeploy, ContractGeneric } from './types.js';
+
+import { Bytes } from '@pezkuwi/types';
+import { bnToBn, compactAddLength, u8aToU8a } from '@pezkuwi/util';
+import { randomAsU8a } from '@pezkuwi/util-crypto';
+
+export const EMPTY_SALT = new Uint8Array();
+
+export function withMeta <T extends { meta: AbiMessage }> (meta: AbiMessage, creator: Omit<T, 'meta'>): T {
+  (creator as T).meta = meta;
+
+  return creator as T;
+}
+
+export function createBluePrintTx <ApiType extends ApiTypes, R extends SubmittableResult> (meta: AbiMessage, fn: (options: BlueprintOptions, params: unknown[]) => SubmittableExtrinsic<ApiType, R>): BlueprintDeploy<ApiType> {
+  return withMeta(meta, (options: BlueprintOptions, ...params: unknown[]): SubmittableExtrinsic<ApiType, R> =>
+    fn(options, params)
+  );
+}
+
+export function createBluePrintWithId <T> (fn: (constructorOrId: AbiConstructor | string | number, options: BlueprintOptions, params: unknown[]) => T): ContractGeneric<BlueprintOptions, T> {
+  return (constructorOrId: AbiConstructor | string | number, options: BlueprintOptions, ...params: unknown[]): T =>
+    fn(constructorOrId, options, params);
+}
+
+export function encodeSalt (salt: Uint8Array | string | null = randomAsU8a()): Uint8Array {
+  return salt instanceof Bytes
+    ? salt
+    : salt?.length
+      ? compactAddLength(u8aToU8a(salt))
+      : EMPTY_SALT;
+}
+
+export function convertWeight (weight: WeightV1 | WeightV2 | bigint | string | number | BN): WeightAll {
+  const [refTime, proofSize] = isWeightV2(weight)
+    ? [weight.refTime.toBn(), weight.proofSize.toBn()]
+    : [bnToBn(weight), undefined];
+
+  return {
+    v1Weight: refTime,
+    v2Weight: { proofSize, refTime }
+  };
+}
+
+export function isWeightV2 (weight: WeightV1 | WeightV2 | bigint | string | number | BN): weight is WeightV2 {
+  return !!(weight as WeightV2).proofSize;
+}

packages/api-contract/src/bundle.ts

@@ -0,0 +1,10 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// all named
+export { Abi } from './Abi/index.js';
+export { packageInfo } from './packageInfo.js';
+
+// all starred
+export * from './promise/index.js';
+export * from './rx/index.js';

packages/api-contract/src/checkTypes.manual.ts

@@ -0,0 +1,45 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// Simple non-runnable checks to test type definitions in the editor itself
+
+import '@pezkuwi/api-augment';
+
+import type { TestKeyringMapBizinikiwi } from '@pezkuwi/keyring/testingPairs';
+
+import { ApiPromise } from '@pezkuwi/api';
+import { BlueprintPromise, ContractPromise } from '@pezkuwi/api-contract';
+import { createTestPairs } from '@pezkuwi/keyring/testingPairs';
+
+import abiIncrementer from './test/contracts/ink/v0/incrementer.json' assert { type: 'json' };
+
+async function checkBlueprint (api: ApiPromise, pairs: TestKeyringMapBizinikiwi): Promise<void> {
+  const blueprint = new BlueprintPromise(api, abiIncrementer as Record<string, unknown>, '0x1234');
+
+  await blueprint.tx['new']({ gasLimit: 456, salt: '0x1234', value: 123 }, 42).signAndSend(pairs.bob);
+  await blueprint.tx['new']({ gasLimit: 456, value: 123 }, 42).signAndSend(pairs.bob);
+}
+
+async function checkContract (api: ApiPromise, pairs: TestKeyringMapBizinikiwi): Promise<void> {
+  const contract = new ContractPromise(api, abiIncrementer as Record<string, unknown>, '0x1234');
+
+  // queries
+  await contract.query['get'](pairs.alice.address, {});
+
+  // execute
+  await contract.tx['inc']({ gasLimit: 1234 }, 123).signAndSend(pairs.eve);
+}
+
+async function main (): Promise<void> {
+  const api = await ApiPromise.create({
+    hasher: (data: Uint8Array): Uint8Array => data
+  });
+  const pairs = createTestPairs();
+
+  await Promise.all([
+    checkBlueprint(api, pairs),
+    checkContract(api, pairs)
+  ]);
+}
+
+main().catch(console.error);

packages/api-contract/src/index.ts

@@ -0,0 +1,6 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import './packageDetect.js';
+
+export * from './bundle.js';

packages/api-contract/src/mod.ts

@@ -0,0 +1,4 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export * from './index.js';

packages/api-contract/src/packageDetect.ts

@@ -0,0 +1,13 @@
+// Copyright 2017-2026 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// Do not edit, auto-generated by @pezkuwi/dev
+// (packageInfo imports will be kept as-is, user-editable)
+
+import { packageInfo as apiInfo } from '@pezkuwi/api/packageInfo';
+import { packageInfo as typesInfo } from '@pezkuwi/types/packageInfo';
+import { detectPackage } from '@pezkuwi/util';
+
+import { packageInfo } from './packageInfo.js';
+
+detectPackage(packageInfo, null, [apiInfo, typesInfo]);

packages/api-contract/src/packageInfo.ts

@@ -0,0 +1,6 @@
+// Copyright 2017-2026 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// Do not edit, auto-generated by @pezkuwi/dev
+
+export const packageInfo = { name: '@pezkuwi/api-contract', path: 'auto', type: 'auto', version: '16.5.4' };

packages/api-contract/src/promise/index.ts

@@ -0,0 +1,28 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ApiPromise } from '@pezkuwi/api';
+import type { AccountId, AccountId20, Hash } from '@pezkuwi/types/interfaces';
+import type { Abi } from '../Abi/index.js';
+
+import { toPromiseMethod } from '@pezkuwi/api';
+
+import { Blueprint, Code, Contract } from '../base/index.js';
+
+export class BlueprintPromise extends Blueprint<'promise'> {
+  constructor (api: ApiPromise, abi: string | Record<string, unknown> | Abi, codeHash: string | Hash) {
+    super(api, abi, codeHash, toPromiseMethod);
+  }
+}
+
+export class CodePromise extends Code<'promise'> {
+  constructor (api: ApiPromise, abi: string | Record<string, unknown> | Abi, wasm: Uint8Array | string | Buffer | null | undefined) {
+    super(api, abi, wasm, toPromiseMethod);
+  }
+}
+
+export class ContractPromise extends Contract<'promise'> {
+  constructor (api: ApiPromise, abi: string | Record<string, unknown> | Abi, address: string | AccountId | AccountId20) {
+    super(api, abi, address, toPromiseMethod);
+  }
+}

packages/api-contract/src/promise/types.ts

@@ -0,0 +1,7 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { BlueprintSubmittableResult as BaseBlueprintSubmittableResult, CodeSubmittableResult as BaseCodeSubmittableResult } from '../base/index.js';
+
+export type BlueprintSubmittableResult = BaseBlueprintSubmittableResult<'promise'>;
+export type CodeSubmittableResult = BaseCodeSubmittableResult<'promise'>;

packages/api-contract/src/rx/index.ts

@@ -0,0 +1,28 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ApiRx } from '@pezkuwi/api';
+import type { AccountId, Hash } from '@pezkuwi/types/interfaces';
+import type { Abi } from '../Abi/index.js';
+
+import { toRxMethod } from '@pezkuwi/api';
+
+import { Blueprint, Code, Contract } from '../base/index.js';
+
+export class BlueprintRx extends Blueprint<'rxjs'> {
+  constructor (api: ApiRx, abi: string | Record<string, unknown> | Abi, codeHash: string | Hash) {
+    super(api, abi, codeHash, toRxMethod);
+  }
+}
+
+export class CodeRx extends Code<'rxjs'> {
+  constructor (api: ApiRx, abi: string | Record<string, unknown> | Abi, wasm: Uint8Array | string | Buffer | null | undefined) {
+    super(api, abi, wasm, toRxMethod);
+  }
+}
+
+export class ContractRx extends Contract<'rxjs'> {
+  constructor (api: ApiRx, abi: string | Record<string, unknown> | Abi, address: string | AccountId) {
+    super(api, abi, address, toRxMethod);
+  }
+}

packages/api-contract/src/rx/types.ts

@@ -0,0 +1,7 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { BlueprintSubmittableResult as BaseBlueprintSubmittableResult, CodeSubmittableResult as BaseCodeSubmittableResult } from '../base/index.js';
+
+export type BlueprintSubmittableResult = BaseBlueprintSubmittableResult<'promise'>;
+export type CodeSubmittableResult = BaseCodeSubmittableResult<'promise'>;

packages/api-contract/src/test/compare/ink_v0_delegator.test.json

@@ -0,0 +1,47 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_env::types::AccountId",
+    "lookupNameRoot": "InkEnvAccountId"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 2,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 3,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 3,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 4,
+    "type": "i32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_env::types::Hash",
+    "lookupNameRoot": "InkEnvHash"
+  }
+]

packages/api-contract/src/test/compare/ink_v0_dns.test.json

@@ -0,0 +1,232 @@
+[
+  {
+    "info": "Struct",
+    "lookupIndex": 1,
+    "lookupName": "InkStorageCollectionsStashHeader",
+    "type": "{\"lastVacant\":\"u32\",\"len\":\"u32\",\"lenEntries\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Header",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lastVacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "len"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lenEntries"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 2,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 3,
+    "lookupName": "InkStorageCollectionsStashEntry",
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"Hash\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 7,
+        "lookupName": "InkStorageCollectionsStashVacantEntry",
+        "type": "Lookup7",
+        "index": 0,
+        "name": "Vacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 4,
+        "type": "Hash",
+        "docs": [],
+        "namespace": "ink_env::types::Hash",
+        "lookupNameRoot": "InkEnvHash",
+        "index": 1,
+        "name": "Occupied"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 4,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_env::types::Hash",
+    "lookupNameRoot": "InkEnvHash"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 5,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 6,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 6,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 7,
+    "lookupName": "InkStorageCollectionsStashVacantEntry",
+    "type": "{\"next\":\"u32\",\"prev\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::VacantEntry",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "next"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "prev"
+      }
+    ]
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 8,
+    "lookupName": "InkStorageCollectionsHashmapValueEntry",
+    "type": "{\"value\":\"AccountId\",\"keyIndex\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::hashmap::ValueEntry",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 9,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId",
+        "name": "value"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "keyIndex"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 9,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_env::types::AccountId",
+    "lookupNameRoot": "InkEnvAccountId"
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 10,
+    "type": "Result<Null, DnsError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 11,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 12,
+        "lookupName": "DnsError",
+        "type": "Lookup12"
+      }
+    ]
+  },
+  {
+    "info": "Null",
+    "lookupIndex": 11,
+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 12,
+    "lookupName": "DnsError",
+    "type": "{\"_enum\":[\"NameAlreadyExists\",\"CallerIsNotOwner\"]}",
+    "docs": [],
+    "namespace": "dns::dns::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "NameAlreadyExists"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CallerIsNotOwner"
+      }
+    ]
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 13,
+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 9,
+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_env::types::AccountId",
+      "lookupNameRoot": "InkEnvAccountId"
+    }
+  }
+]

packages/api-contract/src/test/compare/ink_v0_erc20.test.json

@@ -0,0 +1,253 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 2,
+    "lookupName": "InkStorageCollectionsStashHeader",
+    "type": "{\"lastVacant\":\"u32\",\"len\":\"u32\",\"lenEntries\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Header",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lastVacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "len"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lenEntries"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 3,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 4,
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"AccountId\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 8,
+        "lookupName": "InkStorageCollectionsStashVacantEntry",
+        "type": "Lookup8",
+        "index": 0,
+        "name": "Vacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 5,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId",
+        "index": 1,
+        "name": "Occupied"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_env::types::AccountId",
+    "lookupNameRoot": "InkEnvAccountId"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 6,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 7,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 7,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 8,
+    "lookupName": "InkStorageCollectionsStashVacantEntry",
+    "type": "{\"next\":\"u32\",\"prev\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::VacantEntry",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "next"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "prev"
+      }
+    ]
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 9,
+    "lookupName": "InkStorageCollectionsHashmapValueEntry",
+    "type": "{\"value\":\"u128\",\"keyIndex\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::hashmap::ValueEntry",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 1,
+        "type": "u128",
+        "docs": [],
+        "namespace": "",
+        "name": "value"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "keyIndex"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 10,
+    "lookupName": "InkStorageCollectionsStashEntry",
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"(AccountId,AccountId)\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 8,
+        "lookupName": "InkStorageCollectionsStashVacantEntry",
+        "type": "Lookup8",
+        "index": 0,
+        "name": "Vacant"
+      },
+      {
+        "info": "Tuple",
+        "lookupIndex": 11,
+        "type": "(AccountId,AccountId)",
+        "docs": [],
+        "namespace": "",
+        "sub": [
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+            "namespace": "ink_env::types::AccountId",
+            "lookupNameRoot": "InkEnvAccountId"
+          },
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+            "lookupIndex": 5,
+            "type": "AccountId",
+            "docs": [],
+            "namespace": "ink_env::types::AccountId",
+            "lookupNameRoot": "InkEnvAccountId"
+          }
+        ],
+        "index": 1,
+        "name": "Occupied"
+      }
+    ]
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+    "type": "(AccountId,AccountId)",
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+    "namespace": "",
+    "sub": [
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+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 5,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 13,
+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 5,
+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_env::types::AccountId",
+      "lookupNameRoot": "InkEnvAccountId"
+    }
+  }
+]

packages/api-contract/src/test/compare/ink_v0_erc721.test.json

@@ -0,0 +1,415 @@
+[
+  {
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+    "lookupIndex": 1,
+    "lookupName": "InkStorageCollectionsStashHeader",
+    "type": "{\"lastVacant\":\"u32\",\"len\":\"u32\",\"lenEntries\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Header",
+    "sub": [
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+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lastVacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "len"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lenEntries"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 2,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 3,
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"u32\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 4,
+        "lookupName": "InkStorageCollectionsStashVacantEntry",
+        "type": "Lookup4",
+        "index": 0,
+        "name": "Vacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "index": 1,
+        "name": "Occupied"
+      }
+    ]
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 4,
+    "lookupName": "InkStorageCollectionsStashVacantEntry",
+    "type": "{\"next\":\"u32\",\"prev\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::VacantEntry",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "next"
+      },
+      {
+        "info": "Plain",
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+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "prev"
+      }
+    ]
+  },
+  {
+    "info": "Struct",
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+    "type": "{\"value\":\"AccountId\",\"keyIndex\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::hashmap::ValueEntry",
+    "sub": [
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+        "type": "AccountId",
+        "docs": [],
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+        "lookupNameRoot": "InkEnvAccountId",
+        "name": "value"
+      },
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+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
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+      }
+    ]
+  },
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+    "lookupNameRoot": "InkEnvAccountId"
+  },
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+    "type": "u8",
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+  },
+  {
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+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"AccountId\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
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+        "lookupNameRoot": "InkEnvAccountId",
+        "index": 1,
+        "name": "Occupied"
+      }
+    ]
+  },
+  {
+    "info": "Struct",
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+    "lookupName": "InkStorageCollectionsHashmapValueEntryEntry",
+    "type": "{\"value\":\"u32\",\"keyIndex\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::hashmap::ValueEntry",
+    "sub": [
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+        "docs": [],
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+      },
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+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "keyIndex"
+      }
+    ]
+  },
+  {
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+    "lookupName": "InkStorageCollectionsStashEntry",
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"(AccountId,AccountId)\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
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+            "lookupNameRoot": "InkEnvAccountId"
+          },
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+            "lookupNameRoot": "InkEnvAccountId"
+          }
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+        "name": "Occupied"
+      }
+    ]
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+        "lookupNameRoot": "InkEnvAccountId"
+      }
+    ]
+  },
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+    "lookupIndex": 13,
+    "lookupName": "InkStorageCollectionsHashmapValueEntryOption",
+    "type": "{\"value\":\"bool\",\"keyIndex\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::hashmap::ValueEntry",
+    "sub": [
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+        "type": "bool",
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+        "docs": [],
+        "namespace": "",
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+      }
+    ]
+  },
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+    "namespace": ""
+  },
+  {
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+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
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+      "type": "AccountId",
+      "docs": [],
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+      "lookupNameRoot": "InkEnvAccountId"
+    }
+  },
+  {
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+    "lookupIndex": 16,
+    "type": "Result<Null, Erc721Error>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 17,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 18,
+        "lookupName": "Erc721Error",
+        "type": "Lookup18"
+      }
+    ]
+  },
+  {
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+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
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+    "lookupIndex": 18,
+    "lookupName": "Erc721Error",
+    "type": "{\"_enum\":[\"NotOwner\",\"NotApproved\",\"TokenExists\",\"TokenNotFound\",\"CannotInsert\",\"CannotRemove\",\"CannotFetchValue\",\"NotAllowed\"]}",
+    "docs": [],
+    "namespace": "erc721::erc721::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "NotOwner"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "NotApproved"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 2,
+        "name": "TokenExists"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 3,
+        "name": "TokenNotFound"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 4,
+        "name": "CannotInsert"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 5,
+        "name": "CannotRemove"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 6,
+        "name": "CannotFetchValue"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 7,
+        "name": "NotAllowed"
+      }
+    ]
+  }
+]

packages/api-contract/src/test/compare/ink_v0_flipper.test.json

@@ -0,0 +1,9 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/compare/ink_v0_flipperBundle.test.json

@@ -0,0 +1,9 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/compare/ink_v0_incrementer.test.json

@@ -0,0 +1,9 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "i32",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/compare/ink_v0_multisigPlain.test.json

@@ -0,0 +1,562 @@
+[
+  {
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+    "lookupIndex": 1,
+    "lookupName": "InkStorageCollectionsStashHeader",
+    "type": "{\"lastVacant\":\"u32\",\"len\":\"u32\",\"lenEntries\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Header",
+    "sub": [
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+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lastVacant"
+      },
+      {
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+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "len"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lenEntries"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 2,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 3,
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"(u32,AccountId)\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
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+        "info": "Si",
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+        "name": "Vacant"
+      },
+      {
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+        "type": "(u32,AccountId)",
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+        "namespace": "",
+        "sub": [
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+            "lookupIndex": 2,
+            "type": "u32",
+            "docs": [],
+            "namespace": ""
+          },
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+            "lookupIndex": 5,
+            "type": "AccountId",
+            "docs": [],
+            "namespace": "ink_env::types::AccountId",
+            "lookupNameRoot": "InkEnvAccountId"
+          }
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+        "namespace": ""
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+        "type": "AccountId",
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+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
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+  },
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+    "type": "AccountId",
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+    "lookupNameRoot": "InkEnvAccountId"
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+    "type": "u8",
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+    "docs": [],
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+    "docs": [],
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+        "type": "Lookup14",
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+        "name": "Occupied"
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+    ]
+  },
+  {
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+    "lookupName": "MultisigPlainTransaction",
+    "type": "{\"callee\":\"AccountId\",\"selector\":\"[u8;4]\",\"input\":\"Bytes\",\"transferredValue\":\"u128\",\"gasLimit\":\"u64\"}",
+    "docs": [],
+    "namespace": "multisig_plain::multisig_plain::Transaction",
+    "sub": [
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+        "type": "AccountId",
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+          "type": "u8",
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packages/api-contract/src/test/compare/ink_v1_flipper.test.json

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packages/api-contract/src/test/compare/ink_v1_psp22.test.json

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packages/api-contract/src/test/compare/ink_v2_erc20.test.json

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+    "lookupName": "InkPrimitivesKey",
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
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+      "lookupIndex": 4,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    },
+    "typeName": "[u8;32]"
+  },
+  {
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+    "lookupName": "InkStorageLazyMapping",
+    "type": "{\"offsetKey\":\"InkPrimitivesKey\"}",
+    "docs": [],
+    "namespace": "ink_storage::lazy::mapping::Mapping",
+    "sub": [
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+        "info": "VecFixed",
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+        "type": "[u8;32]",
+        "docs": [],
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+        "sub": {
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+          "type": "u8",
+          "docs": [],
+          "namespace": ""
+        },
+        "typeName": "Key",
+        "name": "offsetKey"
+      }
+    ]
+  },
+  {
+    "info": "Tuple",
+    "lookupIndex": 7,
+    "type": "(AccountId,AccountId)",
+    "docs": [],
+    "namespace": "",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
+      }
+    ]
+  },
+  {
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+    "lookupIndex": 8,
+    "type": "Result<Null, Erc20Error>",
+    "docs": [],
+    "namespace": "Result",
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+        "name": "Ok",
+        "info": "Null",
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+        "type": "Null",
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+        "namespace": ""
+      },
+      {
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+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 10,
+        "lookupName": "Erc20Error",
+        "type": "Lookup10"
+      }
+    ]
+  },
+  {
+    "info": "Null",
+    "lookupIndex": 9,
+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 10,
+    "lookupName": "Erc20Error",
+    "type": "{\"_enum\":[\"InsufficientBalance\",\"InsufficientAllowance\"]}",
+    "docs": [],
+    "namespace": "erc20::erc20::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "InsufficientBalance"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "InsufficientAllowance"
+      }
+    ]
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 11,
+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 2,
+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_env::types::AccountId",
+      "lookupNameRoot": "InkEnvAccountId"
+    }
+  }
+]

packages/api-contract/src/test/compare/ink_v2_flipper.test.json

@@ -0,0 +1,9 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/compare/ink_v3_flipper.test.json

@@ -0,0 +1,9 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/compare/ink_v3_traitErc20.test.json

@@ -0,0 +1,205 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 1,
+    "type": "{\"offsetKey\":\"InkPrimitivesKey\"}",
+    "docs": [],
+    "namespace": "ink_storage::lazy::mapping::Mapping",
+    "sub": [
+      {
+        "info": "VecFixed",
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+        "lookupName": "InkPrimitivesKey",
+        "type": "[u8;32]",
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+        "namespace": "",
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+        "sub": {
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+          "docs": [],
+          "namespace": ""
+        },
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+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 2,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_env::types::AccountId",
+    "lookupNameRoot": "InkEnvAccountId"
+  },
+  {
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+    "lookupIndex": 3,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
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+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 4,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "VecFixed",
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+    "lookupName": "InkPrimitivesKey",
+    "type": "[u8;32]",
+    "docs": [],
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+    "sub": {
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+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    },
+    "typeName": "[u8;32]"
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 6,
+    "lookupName": "InkStorageLazyMapping",
+    "type": "{\"offsetKey\":\"InkPrimitivesKey\"}",
+    "docs": [],
+    "namespace": "ink_storage::lazy::mapping::Mapping",
+    "sub": [
+      {
+        "info": "VecFixed",
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+        "lookupName": "InkPrimitivesKey",
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+    "namespace": "",
+    "sub": [
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+        "docs": [],
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+        "lookupNameRoot": "InkEnvAccountId"
+      },
+      {
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+        "lookupIndex": 2,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
+      }
+    ]
+  },
+  {
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+    "docs": [],
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+    "sub": [
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+      },
+      {
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+        "docs": [],
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+        "lookupName": "TraitErc20Erc20Error",
+        "type": "Lookup10"
+      }
+    ]
+  },
+  {
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+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 10,
+    "lookupName": "TraitErc20Erc20Error",
+    "type": "{\"_enum\":[\"InsufficientBalance\",\"InsufficientAllowance\"]}",
+    "docs": [],
+    "namespace": "trait_erc20::erc20::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "InsufficientBalance"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "InsufficientAllowance"
+      }
+    ]
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 11,
+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
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+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_env::types::AccountId",
+      "lookupNameRoot": "InkEnvAccountId"
+    }
+  }
+]

packages/api-contract/src/test/compare/ink_v4_erc20Contract.test.json

@@ -0,0 +1,253 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
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+    "lookupIndex": 1,
+    "type": "Result<Null, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
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+        "info": "Null",
+        "lookupIndex": 2,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
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+    "lookupIndex": 2,
+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 3,
+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
+        "index": 0,
+        "info": "Null",
+        "name": "__Unused0",
+        "type": "Null"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 4,
+    "type": "Result<u128, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
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+        "info": "Plain",
+        "lookupIndex": 0,
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+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_primitives::types::AccountId",
+    "lookupNameRoot": "InkPrimitivesAccountId"
+  },
+  {
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+    "type": "[u8;32]",
+    "docs": [],
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+    "length": 32,
+    "sub": {
+      "info": "Plain",
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+      "namespace": ""
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+  },
+  {
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+    "lookupIndex": 7,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
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+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
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+        "info": "Result",
+        "lookupIndex": 9,
+        "type": "Result<Null, Erc20Error>",
+        "docs": [],
+        "namespace": "Result",
+        "sub": [
+          {
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+            "info": "Null",
+            "lookupIndex": 2,
+            "type": "Null",
+            "docs": [],
+            "namespace": ""
+          },
+          {
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+            "docs": [],
+            "info": "Si",
+            "lookupIndex": 10,
+            "lookupName": "Erc20Error",
+            "type": "Lookup10"
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+        ]
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+      {
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+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 9,
+    "type": "Result<Null, Erc20Error>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 2,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 10,
+        "lookupName": "Erc20Error",
+        "type": "Lookup10"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 10,
+    "lookupName": "Erc20Error",
+    "type": "{\"_enum\":[\"InsufficientBalance\",\"InsufficientAllowance\"]}",
+    "docs": [],
+    "namespace": "erc20::erc20::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "InsufficientBalance"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "InsufficientAllowance"
+      }
+    ]
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 11,
+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
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+      "lookupIndex": 5,
+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_primitives::types::AccountId",
+      "lookupNameRoot": "InkPrimitivesAccountId"
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 13,
+    "type": "u64",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 14,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 15,
+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_env::types::NoChainExtension",
+    "lookupNameRoot": "InkEnvNoChainExtension"
+  }
+]

packages/api-contract/src/test/compare/ink_v4_erc20Metadata.test.json

@@ -0,0 +1,253 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 1,
+    "type": "Result<Null, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
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+        "info": "Null",
+        "lookupIndex": 2,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
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+    "lookupIndex": 2,
+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 3,
+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
+        "index": 0,
+        "info": "Null",
+        "name": "__Unused0",
+        "type": "Null"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 4,
+    "type": "Result<u128, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "u128",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_primitives::types::AccountId",
+    "lookupNameRoot": "InkPrimitivesAccountId"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 6,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 7,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 7,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 8,
+    "type": "Result<Result<Null, Erc20Error>, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Result",
+        "lookupIndex": 9,
+        "type": "Result<Null, Erc20Error>",
+        "docs": [],
+        "namespace": "Result",
+        "sub": [
+          {
+            "name": "Ok",
+            "info": "Null",
+            "lookupIndex": 2,
+            "type": "Null",
+            "docs": [],
+            "namespace": ""
+          },
+          {
+            "name": "Error",
+            "docs": [],
+            "info": "Si",
+            "lookupIndex": 10,
+            "lookupName": "Erc20Error",
+            "type": "Lookup10"
+          }
+        ]
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 9,
+    "type": "Result<Null, Erc20Error>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 2,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 10,
+        "lookupName": "Erc20Error",
+        "type": "Lookup10"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 10,
+    "lookupName": "Erc20Error",
+    "type": "{\"_enum\":[\"InsufficientBalance\",\"InsufficientAllowance\"]}",
+    "docs": [],
+    "namespace": "erc20::erc20::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "InsufficientBalance"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "InsufficientAllowance"
+      }
+    ]
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 11,
+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
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+      "lookupIndex": 5,
+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_primitives::types::AccountId",
+      "lookupNameRoot": "InkPrimitivesAccountId"
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 13,
+    "type": "u64",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 14,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 15,
+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_env::types::NoChainExtension",
+    "lookupNameRoot": "InkEnvNoChainExtension"
+  }
+]

packages/api-contract/src/test/compare/ink_v4_flipperContract.test.json

@@ -0,0 +1,155 @@
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packages/api-contract/src/test/compare/ink_v4_flipperMetadata.test.json

@@ -0,0 +1,155 @@
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packages/api-contract/src/test/compare/ink_v5_erc20.test.json

@@ -0,0 +1,370 @@
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packages/api-contract/src/test/compare/ink_v5_erc20AnonymousTransferMetadata.test.json

@@ -0,0 +1,370 @@
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packages/api-contract/src/test/compare/ink_v5_erc20Contract.test.json

@@ -0,0 +1,370 @@
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packages/api-contract/src/test/compare/ink_v5_erc20Metadata.test.json

@@ -0,0 +1,370 @@
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+        "lookupName": "Erc20Error",
+        "type": "Lookup19"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 19,
+    "lookupName": "Erc20Error",
+    "type": "{\"_enum\":[\"InsufficientBalance\",\"InsufficientAllowance\"]}",
+    "docs": [],
+    "namespace": "erc20::erc20::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "InsufficientBalance"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "InsufficientAllowance"
+      }
+    ]
+  },
+  {
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+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 2,
+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_primitives::types::AccountId",
+      "lookupNameRoot": "InkPrimitivesAccountId"
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 21,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 22,
+    "type": "u64",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 23,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
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+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_env::types::NoChainExtension",
+    "lookupNameRoot": "InkEnvNoChainExtension"
+  }
+]

packages/api-contract/src/test/compare/ink_v5_flipperContract.test.json

@@ -0,0 +1,174 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 1,
+    "lookupName": "Flipper",
+    "type": "{\"value\":\"bool\"}",
+    "docs": [],
+    "namespace": "flipper::flipper::Flipper",
+    "sub": [
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+        "docs": [],
+        "name": "value",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "bool",
+        "namespace": "",
+        "typeName": ""
+      }
+    ]
+  },
+  {
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+        "info": "Null",
+        "lookupIndex": 3,
+        "type": "Null",
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+        "namespace": ""
+      },
+      {
+        "name": "Error",
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+        "info": "Si",
+        "lookupIndex": 4,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup4"
+      }
+    ]
+  },
+  {
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+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
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+    "lookupIndex": 4,
+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
+        "index": 0,
+        "info": "Null",
+        "name": "__Unused0",
+        "type": "Null"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 5,
+    "type": "Result<bool, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "bool",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
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+        "lookupIndex": 4,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup4"
+      }
+    ]
+  },
+  {
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+    "docs": [],
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+  {
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+      "type": "u8",
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+  {
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+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
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+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 10,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 11,
+    "type": "u64",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
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+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_env::types::NoChainExtension",
+    "lookupNameRoot": "InkEnvNoChainExtension"
+  }
+]

packages/api-contract/src/test/compare/ink_v5_flipperMetadata.test.json

@@ -0,0 +1,174 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 1,
+    "lookupName": "Flipper",
+    "type": "{\"value\":\"bool\"}",
+    "docs": [],
+    "namespace": "flipper::flipper::Flipper",
+    "sub": [
+      {
+        "docs": [],
+        "name": "value",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "bool",
+        "namespace": "",
+        "typeName": ""
+      }
+    ]
+  },
+  {
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+        "info": "Null",
+        "lookupIndex": 3,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
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+        "docs": [],
+        "info": "Si",
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+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup4"
+      }
+    ]
+  },
+  {
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+    "docs": [],
+    "namespace": ""
+  },
+  {
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+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
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+        "info": "Null",
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+        "type": "Null"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 5,
+    "type": "Result<bool, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
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+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "bool",
+        "docs": [],
+        "namespace": ""
+      },
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+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 4,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup4"
+      }
+    ]
+  },
+  {
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+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_primitives::types::AccountId",
+    "lookupNameRoot": "InkPrimitivesAccountId"
+  },
+  {
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+    "sub": {
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+  {
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+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
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+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 10,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 11,
+    "type": "u64",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 13,
+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_env::types::NoChainExtension",
+    "lookupNameRoot": "InkEnvNoChainExtension"
+  }
+]

packages/api-contract/src/test/compare/ink_v6_erc20Contract.test.json

@@ -0,0 +1,418 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "U256",
+    "docs": [],
+    "namespace": "primitive_types::U256",
+    "lookupNameRoot": "PrimitiveTypesU256"
+  },
+  {
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+    "lookupIndex": 1,
+    "type": "[u64;4]",
+    "docs": [],
+    "namespace": "",
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+    "sub": {
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+    "docs": [],
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+  },
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+    "lookupIndex": 8,
+    "lookupName": "InkStorageTraitsImplsAutoKey",
+    "type": "Null",
+    "docs": [],
+    "namespace": "ink_storage_traits::impls::AutoKey"
+  },
+  {
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+    "lookupIndex": 9,
+    "lookupName": "InkStorageTraitsImplsManualKey",
+    "type": "Null",
+    "docs": [],
+    "namespace": "ink_storage_traits::impls::ManualKey"
+  },
+  {
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+  },
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+        "lookupNameRoot": "PrimitiveTypesH160"
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+        "type": "H160",
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+        "lookupNameRoot": "PrimitiveTypesH160"
+      }
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+  {
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+    "docs": [],
+    "namespace": "ink_storage_traits::impls::ResolverKey"
+  },
+  {
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+    "lookupName": "InkStorageTraitsImplsManualKey",
+    "type": "Null",
+    "docs": [],
+    "namespace": "ink_storage_traits::impls::ManualKey"
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 15,
+    "lookupName": "Erc20",
+    "type": "{\"totalSupply\":\"U256\",\"balances\":\"Null\",\"allowances\":\"InkStorageLazyMapping\"}",
+    "docs": [],
+    "namespace": "erc20::erc20::Erc20",
+    "sub": [
+      {
+        "docs": [],
+        "name": "totalSupply",
+        "info": "Plain",
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+        "type": "U256",
+        "namespace": "primitive_types::U256",
+        "lookupNameRoot": "PrimitiveTypesU256",
+        "typeName": ""
+      },
+      {
+        "docs": [],
+        "name": "balances",
+        "info": "Null",
+        "lookupIndex": 3,
+        "type": "Null",
+        "namespace": "ink_storage::lazy::mapping::Mapping",
+        "typeName": ""
+      },
+      {
+        "docs": [],
+        "name": "allowances",
+        "info": "Null",
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+        "lookupName": "InkStorageLazyMapping",
+        "type": "Null",
+        "namespace": "ink_storage::lazy::mapping::Mapping",
+        "typeName": ""
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+    ]
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+  {
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+    "docs": [],
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+        "type": "Null",
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+      },
+      {
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+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup17"
+      }
+    ]
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+  {
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+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
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+        "type": "Null"
+      },
+      {
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+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
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+    "namespace": "Result",
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+        "lookupIndex": 0,
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+        "lookupNameRoot": "PrimitiveTypesU256"
+      },
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+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 17,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup17"
+      }
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+        "type": "Result<Null, Erc20Error>",
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+        "namespace": "Result",
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+          },
+          {
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+            "lookupName": "Erc20Error",
+            "type": "Lookup21"
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+        ]
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+      {
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+    ]
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+  {
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+    "type": "Result<Null, Erc20Error>",
+    "docs": [],
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+    "sub": [
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+      },
+      {
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+        "info": "Si",
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+        "lookupName": "Erc20Error",
+        "type": "Lookup21"
+      }
+    ]
+  },
+  {
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+    "lookupIndex": 21,
+    "lookupName": "Erc20Error",
+    "type": "{\"_enum\":[\"InsufficientBalance\",\"InsufficientAllowance\"]}",
+    "docs": [],
+    "namespace": "erc20::erc20::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "InsufficientBalance"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "InsufficientAllowance"
+      }
+    ]
+  },
+  {
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+    "type": "Option<H160>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
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+      "docs": [],
+      "namespace": "primitive_types::H160",
+      "lookupNameRoot": "PrimitiveTypesH160"
+    }
+  },
+  {
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+    "lookupIndex": 23,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_primitives::types::AccountId",
+    "lookupNameRoot": "InkPrimitivesAccountId"
+  },
+  {
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+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
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+      "namespace": ""
+    }
+  },
+  {
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+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 26,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 27,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 28,
+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_primitives::types::NoChainExtension",
+    "lookupNameRoot": "InkPrimitivesNoChainExtension"
+  }
+]

packages/api-contract/src/test/compare/ink_v6_erc20Metadata.test.json

@@ -0,0 +1,418 @@
+[
+  {
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+    "lookupIndex": 0,
+    "type": "U256",
+    "docs": [],
+    "namespace": "primitive_types::U256",
+    "lookupNameRoot": "PrimitiveTypesU256"
+  },
+  {
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+    "lookupIndex": 1,
+    "type": "[u64;4]",
+    "docs": [],
+    "namespace": "",
+    "length": 4,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 2,
+      "type": "u64",
+      "docs": [],
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+  },
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+    "lookupName": "InkStorageTraitsImplsAutoKey",
+    "type": "Null",
+    "docs": [],
+    "namespace": "ink_storage_traits::impls::AutoKey"
+  },
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+    "lookupIndex": 9,
+    "lookupName": "InkStorageTraitsImplsManualKey",
+    "type": "Null",
+    "docs": [],
+    "namespace": "ink_storage_traits::impls::ManualKey"
+  },
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+        "lookupNameRoot": "PrimitiveTypesH160"
+      },
+      {
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+        "docs": [],
+        "namespace": "primitive_types::H160",
+        "lookupNameRoot": "PrimitiveTypesH160"
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+    ]
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+    "namespace": "ink_storage_traits::impls::ResolverKey"
+  },
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+    "lookupName": "InkStorageTraitsImplsManualKey",
+    "type": "Null",
+    "docs": [],
+    "namespace": "ink_storage_traits::impls::ManualKey"
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 15,
+    "lookupName": "Erc20",
+    "type": "{\"totalSupply\":\"U256\",\"balances\":\"Null\",\"allowances\":\"InkStorageLazyMapping\"}",
+    "docs": [],
+    "namespace": "erc20::erc20::Erc20",
+    "sub": [
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+        "docs": [],
+        "name": "totalSupply",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "U256",
+        "namespace": "primitive_types::U256",
+        "lookupNameRoot": "PrimitiveTypesU256",
+        "typeName": ""
+      },
+      {
+        "docs": [],
+        "name": "balances",
+        "info": "Null",
+        "lookupIndex": 3,
+        "type": "Null",
+        "namespace": "ink_storage::lazy::mapping::Mapping",
+        "typeName": ""
+      },
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+        "docs": [],
+        "name": "allowances",
+        "info": "Null",
+        "lookupIndex": 11,
+        "lookupName": "InkStorageLazyMapping",
+        "type": "Null",
+        "namespace": "ink_storage::lazy::mapping::Mapping",
+        "typeName": ""
+      }
+    ]
+  },
+  {
+    "info": "Result",
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+    "type": "Result<Null, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 10,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 17,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup17"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 17,
+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
+        "index": 0,
+        "info": "Null",
+        "name": "__Unused0",
+        "type": "Null"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 18,
+    "type": "Result<U256, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "U256",
+        "docs": [],
+        "namespace": "primitive_types::U256",
+        "lookupNameRoot": "PrimitiveTypesU256"
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 17,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup17"
+      }
+    ]
+  },
+  {
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+    "type": "Result<Result<Null, Erc20Error>, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Result",
+        "lookupIndex": 20,
+        "type": "Result<Null, Erc20Error>",
+        "docs": [],
+        "namespace": "Result",
+        "sub": [
+          {
+            "name": "Ok",
+            "info": "Null",
+            "lookupIndex": 10,
+            "type": "Null",
+            "docs": [],
+            "namespace": ""
+          },
+          {
+            "name": "Error",
+            "docs": [],
+            "info": "Si",
+            "lookupIndex": 21,
+            "lookupName": "Erc20Error",
+            "type": "Lookup21"
+          }
+        ]
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 17,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup17"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 20,
+    "type": "Result<Null, Erc20Error>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 10,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 21,
+        "lookupName": "Erc20Error",
+        "type": "Lookup21"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 21,
+    "lookupName": "Erc20Error",
+    "type": "{\"_enum\":[\"InsufficientBalance\",\"InsufficientAllowance\"]}",
+    "docs": [],
+    "namespace": "erc20::erc20::Error",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "InsufficientBalance"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "InsufficientAllowance"
+      }
+    ]
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 22,
+    "type": "Option<H160>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 4,
+      "type": "H160",
+      "docs": [],
+      "namespace": "primitive_types::H160",
+      "lookupNameRoot": "PrimitiveTypesH160"
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 23,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_primitives::types::AccountId",
+    "lookupNameRoot": "InkPrimitivesAccountId"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 24,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 6,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 25,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 26,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 27,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 28,
+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_primitives::types::NoChainExtension",
+    "lookupNameRoot": "InkPrimitivesNoChainExtension"
+  }
+]

packages/api-contract/src/test/compare/solang_v0_ints256.test.json

@@ -0,0 +1,9 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "u256",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/compare/user_v0_assetTransfer.test.json

@@ -0,0 +1,54 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "u256",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 2,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 3,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 2,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 4,
+    "lookupName": "AccountId",
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 2,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "Text",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/compare/user_v0_enumExample.test.json

@@ -0,0 +1,303 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "i32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 2,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 3,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 4,
+    "lookupName": "EnumExampleVariant",
+    "type": "{\"_enum\":{\"None\":\"Null\",\"Weekday\":\"EnumExampleWeekday\",\"TupleMaybeSigned\":\"EnumExampleTupleMaybeSigned\",\"NamedMaybeSigned\":\"EnumExampleNamedMaybeSigned\",\"Color\":\"EnumExampleColor\"}}",
+    "docs": [],
+    "namespace": "enum_example::enum_example::Variant",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "None"
+      },
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 5,
+        "lookupName": "EnumExampleWeekday",
+        "type": "Lookup5",
+        "index": 1,
+        "name": "Weekday"
+      },
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 6,
+        "lookupName": "EnumExampleTupleMaybeSigned",
+        "type": "Lookup6",
+        "index": 2,
+        "name": "TupleMaybeSigned"
+      },
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 7,
+        "lookupName": "EnumExampleNamedMaybeSigned",
+        "type": "Lookup7",
+        "index": 3,
+        "name": "NamedMaybeSigned"
+      },
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 8,
+        "lookupName": "EnumExampleColor",
+        "type": "Lookup8",
+        "index": 4,
+        "name": "Color"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 5,
+    "lookupName": "EnumExampleWeekday",
+    "type": "{\"_enum\":[\"Monday\",\"Tuesday\",\"Wednesday\",\"Thursday\",\"Friday\",\"Saturday\",\"Sunday\"]}",
+    "docs": [],
+    "namespace": "enum_example::enum_example::Weekday",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "Monday"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "Tuesday"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 2,
+        "name": "Wednesday"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 3,
+        "name": "Thursday"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 4,
+        "name": "Friday"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 5,
+        "name": "Saturday"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 6,
+        "name": "Sunday"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 6,
+    "lookupName": "EnumExampleTupleMaybeSigned",
+    "type": "{\"_enum\":{\"Signed\":\"i32\",\"Unsigned\":\"u32\"}}",
+    "docs": [],
+    "namespace": "enum_example::enum_example::TupleMaybeSigned",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 1,
+        "type": "i32",
+        "docs": [],
+        "namespace": "",
+        "index": 0,
+        "name": "Signed"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 2,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "index": 1,
+        "name": "Unsigned"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 7,
+    "lookupName": "EnumExampleNamedMaybeSigned",
+    "type": "{\"_enum\":{\"Signed\":\"{\\\"value\\\":\\\"i32\\\"}\",\"Unsigned\":\"{\\\"value\\\":\\\"u32\\\"}\"}}",
+    "docs": [],
+    "namespace": "enum_example::enum_example::NamedMaybeSigned",
+    "sub": [
+      {
+        "info": "Struct",
+        "sub": [
+          {
+            "info": "Plain",
+            "lookupIndex": 1,
+            "type": "i32",
+            "docs": [],
+            "namespace": "",
+            "name": "value"
+          }
+        ],
+        "type": "{\"value\":\"i32\"}",
+        "index": 0,
+        "name": "Signed"
+      },
+      {
+        "info": "Struct",
+        "sub": [
+          {
+            "info": "Plain",
+            "lookupIndex": 2,
+            "type": "u32",
+            "docs": [],
+            "namespace": "",
+            "name": "value"
+          }
+        ],
+        "type": "{\"value\":\"u32\"}",
+        "index": 1,
+        "name": "Unsigned"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 8,
+    "lookupName": "EnumExampleColor",
+    "type": "{\"_enum\":{\"Red\":\"Null\",\"Blue\":\"Null\",\"Green\":\"Null\",\"Yellow\":\"Null\",\"Rgb\":\"{\\\"r\\\":\\\"u8\\\",\\\"g\\\":\\\"u8\\\",\\\"b\\\":\\\"u8\\\"}\",\"Rgba\":\"{\\\"r\\\":\\\"u8\\\",\\\"g\\\":\\\"u8\\\",\\\"b\\\":\\\"u8\\\",\\\"a\\\":\\\"u8\\\"}\"}}",
+    "docs": [],
+    "namespace": "enum_example::enum_example::Color",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "Red"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "Blue"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 2,
+        "name": "Green"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 3,
+        "name": "Yellow"
+      },
+      {
+        "info": "Struct",
+        "sub": [
+          {
+            "info": "Plain",
+            "lookupIndex": 3,
+            "type": "u8",
+            "docs": [],
+            "namespace": "",
+            "name": "r"
+          },
+          {
+            "info": "Plain",
+            "lookupIndex": 3,
+            "type": "u8",
+            "docs": [],
+            "namespace": "",
+            "name": "g"
+          },
+          {
+            "info": "Plain",
+            "lookupIndex": 3,
+            "type": "u8",
+            "docs": [],
+            "namespace": "",
+            "name": "b"
+          }
+        ],
+        "type": "{\"r\":\"u8\",\"g\":\"u8\",\"b\":\"u8\"}",
+        "index": 4,
+        "name": "Rgb"
+      },
+      {
+        "info": "Struct",
+        "sub": [
+          {
+            "info": "Plain",
+            "lookupIndex": 3,
+            "type": "u8",
+            "docs": [],
+            "namespace": "",
+            "name": "r"
+          },
+          {
+            "info": "Plain",
+            "lookupIndex": 3,
+            "type": "u8",
+            "docs": [],
+            "namespace": "",
+            "name": "g"
+          },
+          {
+            "info": "Plain",
+            "lookupIndex": 3,
+            "type": "u8",
+            "docs": [],
+            "namespace": "",
+            "name": "b"
+          },
+          {
+            "info": "Plain",
+            "lookupIndex": 3,
+            "type": "u8",
+            "docs": [],
+            "namespace": "",
+            "name": "a"
+          }
+        ],
+        "type": "{\"r\":\"u8\",\"g\":\"u8\",\"b\":\"u8\",\"a\":\"u8\"}",
+        "index": 5,
+        "name": "Rgba"
+      }
+    ]
+  }
+]

packages/api-contract/src/test/compare/user_v0_recursive.test.json

@@ -0,0 +1,27 @@
+[
+  {
+    "info": "Enum",
+    "lookupIndex": 1,
+    "lookupName": "RecursiveMyEnum",
+    "type": "{\"_enum\":{\"A\":\"Null\",\"B\":\"RecursiveMyEnum\"}}",
+    "docs": [],
+    "namespace": "recursive::MyEnum",
+    "sub": [
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 0,
+        "name": "A"
+      },
+      {
+        "info": "Si",
+        "lookupIndex": 1,
+        "lookupName": "RecursiveMyEnum",
+        "type": "Lookup1",
+        "typeName": "MyEnum",
+        "index": 1,
+        "name": "B"
+      }
+    ]
+  }
+]

packages/api-contract/src/test/compare/user_v0_withString.test.json

@@ -0,0 +1,260 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 2,
+    "lookupName": "InkStorageCollectionsStashHeader",
+    "type": "{\"lastVacant\":\"u32\",\"len\":\"u32\",\"lenEntries\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Header",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lastVacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "len"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "lenEntries"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 3,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 4,
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"AccountId\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 8,
+        "lookupName": "InkStorageCollectionsStashVacantEntry",
+        "type": "Lookup8",
+        "index": 0,
+        "name": "Vacant"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 5,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId",
+        "index": 1,
+        "name": "Occupied"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_env::types::AccountId",
+    "lookupNameRoot": "InkEnvAccountId"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 6,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 7,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 7,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 8,
+    "lookupName": "InkStorageCollectionsStashVacantEntry",
+    "type": "{\"next\":\"u32\",\"prev\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::VacantEntry",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "next"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "prev"
+      }
+    ]
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 9,
+    "lookupName": "InkStorageCollectionsHashmapValueEntry",
+    "type": "{\"value\":\"u128\",\"keyIndex\":\"u32\"}",
+    "docs": [],
+    "namespace": "ink_storage::collections::hashmap::ValueEntry",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 1,
+        "type": "u128",
+        "docs": [],
+        "namespace": "",
+        "name": "value"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 3,
+        "type": "u32",
+        "docs": [],
+        "namespace": "",
+        "name": "keyIndex"
+      }
+    ]
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 10,
+    "lookupName": "InkStorageCollectionsStashEntry",
+    "type": "{\"_enum\":{\"Vacant\":\"InkStorageCollectionsStashVacantEntry\",\"Occupied\":\"(AccountId,AccountId)\"}}",
+    "docs": [],
+    "namespace": "ink_storage::collections::stash::Entry",
+    "sub": [
+      {
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 8,
+        "lookupName": "InkStorageCollectionsStashVacantEntry",
+        "type": "Lookup8",
+        "index": 0,
+        "name": "Vacant"
+      },
+      {
+        "info": "Tuple",
+        "lookupIndex": 11,
+        "type": "(AccountId,AccountId)",
+        "docs": [],
+        "namespace": "",
+        "sub": [
+          {
+            "info": "Plain",
+            "lookupIndex": 5,
+            "type": "AccountId",
+            "docs": [],
+            "namespace": "ink_env::types::AccountId",
+            "lookupNameRoot": "InkEnvAccountId"
+          },
+          {
+            "info": "Plain",
+            "lookupIndex": 5,
+            "type": "AccountId",
+            "docs": [],
+            "namespace": "ink_env::types::AccountId",
+            "lookupNameRoot": "InkEnvAccountId"
+          }
+        ],
+        "index": 1,
+        "name": "Occupied"
+      }
+    ]
+  },
+  {
+    "info": "Tuple",
+    "lookupIndex": 11,
+    "type": "(AccountId,AccountId)",
+    "docs": [],
+    "namespace": "",
+    "sub": [
+      {
+        "info": "Plain",
+        "lookupIndex": 5,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
+      },
+      {
+        "info": "Plain",
+        "lookupIndex": 5,
+        "type": "AccountId",
+        "docs": [],
+        "namespace": "ink_env::types::AccountId",
+        "lookupNameRoot": "InkEnvAccountId"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "Text",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 13,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Option",
+    "lookupIndex": 14,
+    "type": "Option<AccountId>",
+    "docs": [],
+    "namespace": "Option",
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 5,
+      "type": "AccountId",
+      "docs": [],
+      "namespace": "ink_env::types::AccountId",
+      "lookupNameRoot": "InkEnvAccountId"
+    }
+  }
+]

packages/api-contract/src/test/compare/user_v3_ask.test.json

@@ -0,0 +1,71 @@
+[
+  {
+    "info": "Plain",
+    "lookupIndex": 0,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 1,
+    "type": "Text",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 2,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 0,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Struct",
+    "lookupIndex": 3,
+    "type": "{\"inner\":\"[u8;32]\"}",
+    "docs": [],
+    "namespace": "",
+    "sub": [
+      {
+        "docs": [],
+        "name": "inner",
+        "info": "VecFixed",
+        "lookupIndex": 2,
+        "type": "[u8;32]",
+        "namespace": "",
+        "length": 32,
+        "sub": {
+          "info": "Plain",
+          "lookupIndex": 0,
+          "type": "u8",
+          "docs": [],
+          "namespace": ""
+        },
+        "typeName": "FixedArray32"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 4,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "bool",
+    "docs": [],
+    "namespace": ""
+  }
+]

packages/api-contract/src/test/contracts/index.ts

@@ -0,0 +1,20 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import ink from './ink/index.js';
+import solang from './solang/index.js';
+import user from './user/index.js';
+
+const all: Record<string, Record<string, unknown>> = {};
+
+Object
+  .entries({ ink, solang, user })
+  .forEach(([type, abis]) =>
+    Object
+      .entries(abis)
+      .forEach(([name, abi]): void => {
+        all[`${type}_${name}`] = abi;
+      })
+  );
+
+export default all;

packages/api-contract/src/test/contracts/ink/index.ts

@@ -0,0 +1,13 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { createVersionedExport } from '../util.js';
+import * as v0 from './v0/index.js';
+import * as v1 from './v1/index.js';
+import * as v2 from './v2/index.js';
+import * as v3 from './v3/index.js';
+import * as v4 from './v4/index.js';
+import * as v5 from './v5/index.js';
+import * as v6 from './v6/index.js';
+
+export default createVersionedExport({ v0, v1, v2, v3, v4, v5, v6 });

packages/api-contract/src/test/contracts/ink/v0/delegator.json

@@ -0,0 +1,252 @@
+{
+  "metadataVersion": "0.1.0",
+  "source": {
+    "hash": "0x939d1823be952b4d7114448bb1a27fa13bafb8c4b33149efc24e826d8e54035e",
+    "language": "ink! 3.0.0-rc1",
+    "compiler": "rustc 1.48.0-nightly"
+  },
+  "contract": {
+    "name": "delegator",
+    "version": "3.0.0-rc1",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [
+          {
+            "name": "init_value",
+            "type": {
+              "displayName": [
+                "i32"
+              ],
+              "type": 4
+            }
+          },
+          {
+            "name": "accumulator_code_hash",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "name": "adder_code_hash",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "name": "subber_code_hash",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 5
+            }
+          }
+        ],
+        "docs": [
+          " Instantiate a delegator with the given sub-contract codes."
+        ],
+        "name": [
+          "new"
+        ],
+        "selector": "0xd183512b"
+      }
+    ],
+    "docs": [],
+    "events": [],
+    "messages": [
+      {
+        "args": [],
+        "docs": [
+          " Returns the accumulator's value."
+        ],
+        "mutates": false,
+        "name": [
+          "get"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "i32"
+          ],
+          "type": 4
+        },
+        "selector": "0x1e5ca456"
+      },
+      {
+        "args": [
+          {
+            "name": "by",
+            "type": {
+              "displayName": [
+                "i32"
+              ],
+              "type": 4
+            }
+          }
+        ],
+        "docs": [
+          " Delegates the call to either `Adder` or `Subber`."
+        ],
+        "mutates": true,
+        "name": [
+          "change"
+        ],
+        "payable": false,
+        "returnType": null,
+        "selector": "0x0af938f2"
+      },
+      {
+        "args": [],
+        "docs": [
+          " Switches the delegator."
+        ],
+        "mutates": true,
+        "name": [
+          "switch"
+        ],
+        "payable": false,
+        "returnType": null,
+        "selector": "0x5d37c38d"
+      }
+    ]
+  },
+  "storage": {
+    "struct": {
+      "fields": [
+        {
+          "layout": {
+            "enum": {
+              "dispatchKey": "0x0000000000000000000000000000000000000000000000000000000000000000",
+              "variants": {
+                "0": {
+                  "fields": []
+                },
+                "1": {
+                  "fields": []
+                }
+              }
+            }
+          },
+          "name": "which"
+        },
+        {
+          "layout": {
+            "struct": {
+              "fields": [
+                {
+                  "layout": {
+                    "cell": {
+                      "key": "0x0100000000000000000000000000000000000000000000000000000000000000",
+                      "ty": 1
+                    }
+                  },
+                  "name": "account_id"
+                }
+              ]
+            }
+          },
+          "name": "accumulator"
+        },
+        {
+          "layout": {
+            "struct": {
+              "fields": [
+                {
+                  "layout": {
+                    "cell": {
+                      "key": "0x0200000000000000000000000000000000000000000000000000000000000000",
+                      "ty": 1
+                    }
+                  },
+                  "name": "account_id"
+                }
+              ]
+            }
+          },
+          "name": "adder"
+        },
+        {
+          "layout": {
+            "struct": {
+              "fields": [
+                {
+                  "layout": {
+                    "cell": {
+                      "key": "0x0300000000000000000000000000000000000000000000000000000000000000",
+                      "ty": 1
+                    }
+                  },
+                  "name": "account_id"
+                }
+              ]
+            }
+          },
+          "name": "subber"
+        }
+      ]
+    }
+  },
+  "types": [
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "type": 2
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_env",
+        "types",
+        "AccountId"
+      ]
+    },
+    {
+      "def": {
+        "array": {
+          "len": 32,
+          "type": 3
+        }
+      }
+    },
+    {
+      "def": {
+        "primitive": "u8"
+      }
+    },
+    {
+      "def": {
+        "primitive": "i32"
+      }
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "type": 2
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_env",
+        "types",
+        "Hash"
+      ]
+    }
+  ]
+}

packages/api-contract/src/test/contracts/ink/v0/dns.json

@@ -0,0 +1,713 @@
+{
+  "metadataVersion": "0.1.0",
+  "source": {
+    "hash": "0xcf3eee6ac5d38f6f503293735a72b011960e09ec1dd09185ab3c3d28e7770009",
+    "language": "ink! 3.0.0-rc1",
+    "compiler": "rustc 1.48.0-nightly"
+  },
+  "contract": {
+    "name": "dns",
+    "version": "3.0.0-rc1",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [],
+        "docs": [
+          " Creates a new domain name service contract."
+        ],
+        "name": [
+          "new"
+        ],
+        "selector": "0xd183512b"
+      }
+    ],
+    "docs": [],
+    "events": [
+      {
+        "args": [
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "name",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 4
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "from",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 9
+            }
+          }
+        ],
+        "docs": [
+          " Emitted whenever a new name is being registered."
+        ],
+        "name": "Register"
+      },
+      {
+        "args": [
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "name",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 4
+            }
+          },
+          {
+            "docs": [],
+            "indexed": false,
+            "name": "from",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 9
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "old_address",
+            "type": {
+              "displayName": [
+                "Option"
+              ],
+              "type": 13
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "new_address",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 9
+            }
+          }
+        ],
+        "docs": [
+          " Emitted whenever an address changes."
+        ],
+        "name": "SetAddress"
+      },
+      {
+        "args": [
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "name",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 4
+            }
+          },
+          {
+            "docs": [],
+            "indexed": false,
+            "name": "from",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 9
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "old_owner",
+            "type": {
+              "displayName": [
+                "Option"
+              ],
+              "type": 13
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "new_owner",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 9
+            }
+          }
+        ],
+        "docs": [
+          " Emitted whenver a name is being transferred."
+        ],
+        "name": "Transfer"
+      }
+    ],
+    "messages": [
+      {
+        "args": [
+          {
+            "name": "name",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 4
+            }
+          }
+        ],
+        "docs": [
+          " Register specific name with caller as owner."
+        ],
+        "mutates": true,
+        "name": [
+          "register"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "Result"
+          ],
+          "type": 10
+        },
+        "selector": "0x7fb0aded"
+      },
+      {
+        "args": [
+          {
+            "name": "name",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 4
+            }
+          },
+          {
+            "name": "new_address",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 9
+            }
+          }
+        ],
+        "docs": [
+          " Set address for specific name."
+        ],
+        "mutates": true,
+        "name": [
+          "set_address"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "Result"
+          ],
+          "type": 10
+        },
+        "selector": "0x220ac6e3"
+      },
+      {
+        "args": [
+          {
+            "name": "name",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 4
+            }
+          },
+          {
+            "name": "to",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 9
+            }
+          }
+        ],
+        "docs": [
+          " Transfer owner to another address."
+        ],
+        "mutates": true,
+        "name": [
+          "transfer"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "Result"
+          ],
+          "type": 10
+        },
+        "selector": "0xfae3a09d"
+      },
+      {
+        "args": [
+          {
+            "name": "name",
+            "type": {
+              "displayName": [
+                "Hash"
+              ],
+              "type": 4
+            }
+          }
+        ],
+        "docs": [
+          " Get address for specific name."
+        ],
+        "mutates": false,
+        "name": [
+          "get_address"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "AccountId"
+          ],
+          "type": 9
+        },
+        "selector": "0xb9ee7664"
+      }
+    ]
+  },
+  "storage": {
+    "struct": {
+      "fields": [
+        {
+          "layout": {
+            "struct": {
+              "fields": [
+                {
+                  "layout": {
+                    "struct": {
+                      "fields": [
+                        {
+                          "layout": {
+                            "cell": {
+                              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+                              "ty": 1
+                            }
+                          },
+                          "name": "header"
+                        },
+                        {
+                          "layout": {
+                            "struct": {
+                              "fields": [
+                                {
+                                  "layout": {
+                                    "cell": {
+                                      "key": "0x0100000000000000000000000000000000000000000000000000000000000000",
+                                      "ty": 2
+                                    }
+                                  },
+                                  "name": "len"
+                                },
+                                {
+                                  "layout": {
+                                    "array": {
+                                      "cellsPerElem": 1,
+                                      "layout": {
+                                        "cell": {
+                                          "key": "0x0100000001000000000000000000000000000000000000000000000000000000",
+                                          "ty": 3
+                                        }
+                                      },
+                                      "len": 4294967295,
+                                      "offset": "0x0200000000000000000000000000000000000000000000000000000000000000"
+                                    }
+                                  },
+                                  "name": "elems"
+                                }
+                              ]
+                            }
+                          },
+                          "name": "entries"
+                        }
+                      ]
+                    }
+                  },
+                  "name": "keys"
+                },
+                {
+                  "layout": {
+                    "hash": {
+                      "layout": {
+                        "cell": {
+                          "key": "0x0200000001000000000000000000000000000000000000000000000000000000",
+                          "ty": 8
+                        }
+                      },
+                      "offset": "0x0100000001000000000000000000000000000000000000000000000000000000",
+                      "strategy": {
+                        "hasher": "Blake2x256",
+                        "postfix": "",
+                        "prefix": "0x696e6b20686173686d6170"
+                      }
+                    }
+                  },
+                  "name": "values"
+                }
+              ]
+            }
+          },
+          "name": "name_to_address"
+        },
+        {
+          "layout": {
+            "struct": {
+              "fields": [
+                {
+                  "layout": {
+                    "struct": {
+                      "fields": [
+                        {
+                          "layout": {
+                            "cell": {
+                              "key": "0x0200000001000000000000000000000000000000000000000000000000000000",
+                              "ty": 1
+                            }
+                          },
+                          "name": "header"
+                        },
+                        {
+                          "layout": {
+                            "struct": {
+                              "fields": [
+                                {
+                                  "layout": {
+                                    "cell": {
+                                      "key": "0x0300000001000000000000000000000000000000000000000000000000000000",
+                                      "ty": 2
+                                    }
+                                  },
+                                  "name": "len"
+                                },
+                                {
+                                  "layout": {
+                                    "array": {
+                                      "cellsPerElem": 1,
+                                      "layout": {
+                                        "cell": {
+                                          "key": "0x0300000002000000000000000000000000000000000000000000000000000000",
+                                          "ty": 3
+                                        }
+                                      },
+                                      "len": 4294967295,
+                                      "offset": "0x0400000001000000000000000000000000000000000000000000000000000000"
+                                    }
+                                  },
+                                  "name": "elems"
+                                }
+                              ]
+                            }
+                          },
+                          "name": "entries"
+                        }
+                      ]
+                    }
+                  },
+                  "name": "keys"
+                },
+                {
+                  "layout": {
+                    "hash": {
+                      "layout": {
+                        "cell": {
+                          "key": "0x0400000002000000000000000000000000000000000000000000000000000000",
+                          "ty": 8
+                        }
+                      },
+                      "offset": "0x0300000002000000000000000000000000000000000000000000000000000000",
+                      "strategy": {
+                        "hasher": "Blake2x256",
+                        "postfix": "",
+                        "prefix": "0x696e6b20686173686d6170"
+                      }
+                    }
+                  },
+                  "name": "values"
+                }
+              ]
+            }
+          },
+          "name": "name_to_owner"
+        },
+        {
+          "layout": {
+            "cell": {
+              "key": "0x0400000002000000000000000000000000000000000000000000000000000000",
+              "ty": 9
+            }
+          },
+          "name": "default_address"
+        }
+      ]
+    }
+  },
+  "types": [
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "name": "last_vacant",
+              "type": 2
+            },
+            {
+              "name": "len",
+              "type": 2
+            },
+            {
+              "name": "len_entries",
+              "type": 2
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_storage",
+        "collections",
+        "stash",
+        "Header"
+      ]
+    },
+    {
+      "def": {
+        "primitive": "u32"
+      }
+    },
+    {
+      "def": {
+        "variant": {
+          "variants": [
+            {
+              "fields": [
+                {
+                  "type": 7
+                }
+              ],
+              "name": "Vacant"
+            },
+            {
+              "fields": [
+                {
+                  "type": 4
+                }
+              ],
+              "name": "Occupied"
+            }
+          ]
+        }
+      },
+      "params": [
+        4
+      ],
+      "path": [
+        "ink_storage",
+        "collections",
+        "stash",
+        "Entry"
+      ]
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "type": 5
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_env",
+        "types",
+        "Hash"
+      ]
+    },
+    {
+      "def": {
+        "array": {
+          "len": 32,
+          "type": 6
+        }
+      }
+    },
+    {
+      "def": {
+        "primitive": "u8"
+      }
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "name": "next",
+              "type": 2
+            },
+            {
+              "name": "prev",
+              "type": 2
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_storage",
+        "collections",
+        "stash",
+        "VacantEntry"
+      ]
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "name": "value",
+              "type": 9
+            },
+            {
+              "name": "key_index",
+              "type": 2
+            }
+          ]
+        }
+      },
+      "params": [
+        9
+      ],
+      "path": [
+        "ink_storage",
+        "collections",
+        "hashmap",
+        "ValueEntry"
+      ]
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "type": 5
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_env",
+        "types",
+        "AccountId"
+      ]
+    },
+    {
+      "def": {
+        "variant": {
+          "variants": [
+            {
+              "fields": [
+                {
+                  "type": 11
+                }
+              ],
+              "name": "Ok"
+            },
+            {
+              "fields": [
+                {
+                  "type": 12
+                }
+              ],
+              "name": "Err"
+            }
+          ]
+        }
+      },
+      "params": [
+        11,
+        12
+      ],
+      "path": [
+        "Result"
+      ]
+    },
+    {
+      "def": {
+        "tuple": []
+      }
+    },
+    {
+      "def": {
+        "variant": {
+          "variants": [
+            {
+              "discriminant": 0,
+              "name": "NameAlreadyExists"
+            },
+            {
+              "discriminant": 1,
+              "name": "CallerIsNotOwner"
+            }
+          ]
+        }
+      },
+      "path": [
+        "dns",
+        "dns",
+        "Error"
+      ]
+    },
+    {
+      "def": {
+        "variant": {
+          "variants": [
+            {
+              "name": "None"
+            },
+            {
+              "fields": [
+                {
+                  "type": 9
+                }
+              ],
+              "name": "Some"
+            }
+          ]
+        }
+      },
+      "params": [
+        9
+      ],
+      "path": [
+        "Option"
+      ]
+    }
+  ]
+}

packages/api-contract/src/test/contracts/ink/v0/erc20.json

@@ -0,0 +1,704 @@
+{
+  "metadataVersion": "0.1.0",
+  "source": {
+    "hash": "0xe9c60864c76c770865b66c79aa304bc22d2d08cc799d36310df4256db107b8fc",
+    "language": "ink! 3.0.0-rc1",
+    "compiler": "rustc 1.48.0-nightly"
+  },
+  "contract": {
+    "name": "erc20",
+    "version": "3.0.0-rc1",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [
+          {
+            "name": "initial_supply",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "name": [
+          "new"
+        ],
+        "selector": "0xd183512b"
+      }
+    ],
+    "docs": [],
+    "events": [
+      {
+        "args": [
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "from",
+            "type": {
+              "displayName": [
+                "Option"
+              ],
+              "type": 13
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "to",
+            "type": {
+              "displayName": [
+                "Option"
+              ],
+              "type": 13
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "name": "Transfer"
+      },
+      {
+        "args": [
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "owner",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "spender",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "name": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "name": "Approval"
+      }
+    ],
+    "messages": [
+      {
+        "args": [],
+        "docs": [],
+        "mutates": false,
+        "name": [
+          "total_supply"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "Balance"
+          ],
+          "type": 1
+        },
+        "selector": "0xdcb736b5"
+      },
+      {
+        "args": [
+          {
+            "name": "owner",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          }
+        ],
+        "docs": [],
+        "mutates": false,
+        "name": [
+          "balance_of"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "Balance"
+          ],
+          "type": 1
+        },
+        "selector": "0x56e929b2"
+      },
+      {
+        "args": [
+          {
+            "name": "owner",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "name": "spender",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          }
+        ],
+        "docs": [],
+        "mutates": false,
+        "name": [
+          "allowance"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "Balance"
+          ],
+          "type": 1
+        },
+        "selector": "0xf3cfff66"
+      },
+      {
+        "args": [
+          {
+            "name": "to",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "name": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "mutates": true,
+        "name": [
+          "transfer"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "bool"
+          ],
+          "type": 12
+        },
+        "selector": "0xfae3a09d"
+      },
+      {
+        "args": [
+          {
+            "name": "spender",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "name": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "mutates": true,
+        "name": [
+          "approve"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "bool"
+          ],
+          "type": 12
+        },
+        "selector": "0x03d0e114"
+      },
+      {
+        "args": [
+          {
+            "name": "from",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "name": "to",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "name": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "mutates": true,
+        "name": [
+          "transfer_from"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "bool"
+          ],
+          "type": 12
+        },
+        "selector": "0xfcfb2ccd"
+      }
+    ]
+  },
+  "storage": {
+    "struct": {
+      "fields": [
+        {
+          "layout": {
+            "cell": {
+              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+              "ty": 1
+            }
+          },
+          "name": "total_supply"
+        },
+        {
+          "layout": {
+            "struct": {
+              "fields": [
+                {
+                  "layout": {
+                    "struct": {
+                      "fields": [
+                        {
+                          "layout": {
+                            "cell": {
+                              "key": "0x0100000000000000000000000000000000000000000000000000000000000000",
+                              "ty": 2
+                            }
+                          },
+                          "name": "header"
+                        },
+                        {
+                          "layout": {
+                            "struct": {
+                              "fields": [
+                                {
+                                  "layout": {
+                                    "cell": {
+                                      "key": "0x0200000000000000000000000000000000000000000000000000000000000000",
+                                      "ty": 3
+                                    }
+                                  },
+                                  "name": "len"
+                                },
+                                {
+                                  "layout": {
+                                    "array": {
+                                      "cellsPerElem": 1,
+                                      "layout": {
+                                        "cell": {
+                                          "key": "0x0200000001000000000000000000000000000000000000000000000000000000",
+                                          "ty": 4
+                                        }
+                                      },
+                                      "len": 4294967295,
+                                      "offset": "0x0300000000000000000000000000000000000000000000000000000000000000"
+                                    }
+                                  },
+                                  "name": "elems"
+                                }
+                              ]
+                            }
+                          },
+                          "name": "entries"
+                        }
+                      ]
+                    }
+                  },
+                  "name": "keys"
+                },
+                {
+                  "layout": {
+                    "hash": {
+                      "layout": {
+                        "cell": {
+                          "key": "0x0300000001000000000000000000000000000000000000000000000000000000",
+                          "ty": 9
+                        }
+                      },
+                      "offset": "0x0200000001000000000000000000000000000000000000000000000000000000",
+                      "strategy": {
+                        "hasher": "Blake2x256",
+                        "postfix": "",
+                        "prefix": "0x696e6b20686173686d6170"
+                      }
+                    }
+                  },
+                  "name": "values"
+                }
+              ]
+            }
+          },
+          "name": "balances"
+        },
+        {
+          "layout": {
+            "struct": {
+              "fields": [
+                {
+                  "layout": {
+                    "struct": {
+                      "fields": [
+                        {
+                          "layout": {
+                            "cell": {
+                              "key": "0x0300000001000000000000000000000000000000000000000000000000000000",
+                              "ty": 2
+                            }
+                          },
+                          "name": "header"
+                        },
+                        {
+                          "layout": {
+                            "struct": {
+                              "fields": [
+                                {
+                                  "layout": {
+                                    "cell": {
+                                      "key": "0x0400000001000000000000000000000000000000000000000000000000000000",
+                                      "ty": 3
+                                    }
+                                  },
+                                  "name": "len"
+                                },
+                                {
+                                  "layout": {
+                                    "array": {
+                                      "cellsPerElem": 1,
+                                      "layout": {
+                                        "cell": {
+                                          "key": "0x0400000002000000000000000000000000000000000000000000000000000000",
+                                          "ty": 10
+                                        }
+                                      },
+                                      "len": 4294967295,
+                                      "offset": "0x0500000001000000000000000000000000000000000000000000000000000000"
+                                    }
+                                  },
+                                  "name": "elems"
+                                }
+                              ]
+                            }
+                          },
+                          "name": "entries"
+                        }
+                      ]
+                    }
+                  },
+                  "name": "keys"
+                },
+                {
+                  "layout": {
+                    "hash": {
+                      "layout": {
+                        "cell": {
+                          "key": "0x0500000002000000000000000000000000000000000000000000000000000000",
+                          "ty": 9
+                        }
+                      },
+                      "offset": "0x0400000002000000000000000000000000000000000000000000000000000000",
+                      "strategy": {
+                        "hasher": "Blake2x256",
+                        "postfix": "",
+                        "prefix": "0x696e6b20686173686d6170"
+                      }
+                    }
+                  },
+                  "name": "values"
+                }
+              ]
+            }
+          },
+          "name": "allowances"
+        }
+      ]
+    }
+  },
+  "types": [
+    {
+      "def": {
+        "primitive": "u128"
+      }
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "name": "last_vacant",
+              "type": 3
+            },
+            {
+              "name": "len",
+              "type": 3
+            },
+            {
+              "name": "len_entries",
+              "type": 3
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_storage",
+        "collections",
+        "stash",
+        "Header"
+      ]
+    },
+    {
+      "def": {
+        "primitive": "u32"
+      }
+    },
+    {
+      "def": {
+        "variant": {
+          "variants": [
+            {
+              "fields": [
+                {
+                  "type": 8
+                }
+              ],
+              "name": "Vacant"
+            },
+            {
+              "fields": [
+                {
+                  "type": 5
+                }
+              ],
+              "name": "Occupied"
+            }
+          ]
+        }
+      },
+      "params": [
+        5
+      ],
+      "path": [
+        "ink_storage",
+        "collections",
+        "stash",
+        "Entry"
+      ]
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "type": 6
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_env",
+        "types",
+        "AccountId"
+      ]
+    },
+    {
+      "def": {
+        "array": {
+          "len": 32,
+          "type": 7
+        }
+      }
+    },
+    {
+      "def": {
+        "primitive": "u8"
+      }
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "name": "next",
+              "type": 3
+            },
+            {
+              "name": "prev",
+              "type": 3
+            }
+          ]
+        }
+      },
+      "path": [
+        "ink_storage",
+        "collections",
+        "stash",
+        "VacantEntry"
+      ]
+    },
+    {
+      "def": {
+        "composite": {
+          "fields": [
+            {
+              "name": "value",
+              "type": 1
+            },
+            {
+              "name": "key_index",
+              "type": 3
+            }
+          ]
+        }
+      },
+      "params": [
+        1
+      ],
+      "path": [
+        "ink_storage",
+        "collections",
+        "hashmap",
+        "ValueEntry"
+      ]
+    },
+    {
+      "def": {
+        "variant": {
+          "variants": [
+            {
+              "fields": [
+                {
+                  "type": 8
+                }
+              ],
+              "name": "Vacant"
+            },
+            {
+              "fields": [
+                {
+                  "type": 11
+                }
+              ],
+              "name": "Occupied"
+            }
+          ]
+        }
+      },
+      "params": [
+        11
+      ],
+      "path": [
+        "ink_storage",
+        "collections",
+        "stash",
+        "Entry"
+      ]
+    },
+    {
+      "def": {
+        "tuple": [
+          5,
+          5
+        ]
+      }
+    },
+    {
+      "def": {
+        "primitive": "bool"
+      }
+    },
+    {
+      "def": {
+        "variant": {
+          "variants": [
+            {
+              "name": "None"
+            },
+            {
+              "fields": [
+                {
+                  "type": 5
+                }
+              ],
+              "name": "Some"
+            }
+          ]
+        }
+      },
+      "params": [
+        5
+      ],
+      "path": [
+        "Option"
+      ]
+    }
+  ]
+}

packages/api-contract/src/test/contracts/ink/v0/flipper.contract.json

@@ -0,0 +1,107 @@
+{
+  "metadataVersion": "0.1.0",
+  "source": {
+    "hash": "0x98086d5ccadd437459b812682380250f51a3034272cd1108e499acc0cafe9f42",
+    "language": "ink! 3.0.0-rc2",
+    "compiler": "rustc 1.49.0-nightly",
+    "wasm": "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"
+  },
+  "contract": {
+    "name": "flipper",
+    "version": "3.0.0-rc2",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [
+          {
+            "name": "init_value",
+            "type": {
+              "displayName": [
+                "bool"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [
+          " Creates a new flipper smart contract initialized with the given value."
+        ],
+        "name": [
+          "new"
+        ],
+        "selector": "0xd183512b"
+      },
+      {
+        "args": [],
+        "docs": [
+          " Creates a new flipper smart contract initialized to `false`."
+        ],
+        "name": [
+          "default"
+        ],
+        "selector": "0x6a3712e2"
+      }
+    ],
+    "docs": [],
+    "events": [],
+    "messages": [
+      {
+        "args": [],
+        "docs": [
+          " Flips the current value of the Flipper's bool."
+        ],
+        "mutates": true,
+        "name": [
+          "flip"
+        ],
+        "payable": false,
+        "returnType": null,
+        "selector": "0xc096a5f3"
+      },
+      {
+        "args": [],
+        "docs": [
+          " Returns the current value of the Flipper's bool."
+        ],
+        "mutates": false,
+        "name": [
+          "get"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "bool"
+          ],
+          "type": 1
+        },
+        "selector": "0x1e5ca456"
+      }
+    ]
+  },
+  "storage": {
+    "struct": {
+      "fields": [
+        {
+          "layout": {
+            "cell": {
+              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+              "ty": 1
+            }
+          },
+          "name": "value"
+        }
+      ]
+    }
+  },
+  "types": [
+    {
+      "def": {
+        "primitive": "bool"
+      }
+    }
+  ]
+}

packages/api-contract/src/test/contracts/ink/v0/flipper.json

@@ -0,0 +1,106 @@
+{
+  "metadataVersion": "0.1.0",
+  "source": {
+    "hash": "0xb6b5fa9791b27da76f1046de45d57bb835a8dfc44f21b223d8d6bb88e5eb5141",
+    "language": "ink! 3.0.0-rc1",
+    "compiler": "rustc 1.48.0-nightly"
+  },
+  "contract": {
+    "name": "flipper",
+    "version": "3.0.0-rc1",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [
+          {
+            "name": "init_value",
+            "type": {
+              "displayName": [
+                "bool"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [
+          " Creates a new flipper smart contract initialized with the given value."
+        ],
+        "name": [
+          "new"
+        ],
+        "selector": "0xd183512b"
+      },
+      {
+        "args": [],
+        "docs": [
+          " Creates a new flipper smart contract initialized to `false`."
+        ],
+        "name": [
+          "default"
+        ],
+        "selector": "0x6a3712e2"
+      }
+    ],
+    "docs": [],
+    "events": [],
+    "messages": [
+      {
+        "args": [],
+        "docs": [
+          " Flips the current value of the Flipper's bool."
+        ],
+        "mutates": true,
+        "name": [
+          "flip"
+        ],
+        "payable": false,
+        "returnType": null,
+        "selector": "0xc096a5f3"
+      },
+      {
+        "args": [],
+        "docs": [
+          " Returns the current value of the Flipper's bool."
+        ],
+        "mutates": false,
+        "name": [
+          "get"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "bool"
+          ],
+          "type": 1
+        },
+        "selector": "0x1e5ca456"
+      }
+    ]
+  },
+  "storage": {
+    "struct": {
+      "fields": [
+        {
+          "layout": {
+            "cell": {
+              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+              "ty": 1
+            }
+          },
+          "name": "value"
+        }
+      ]
+    }
+  },
+  "types": [
+    {
+      "def": {
+        "primitive": "bool"
+      }
+    }
+  ]
+}

packages/api-contract/src/test/contracts/ink/v0/incrementer.json

@@ -0,0 +1,108 @@
+{
+  "metadataVersion": "0.1.0",
+  "source": {
+    "hash": "0x8b30429ee0f4dc19cec91b09d186c805eaac6615492c1edf3bc1efaff0b7fecf",
+    "language": "ink! 3.0.0-rc1",
+    "compiler": "rustc 1.48.0-nightly"
+  },
+  "contract": {
+    "name": "incrementer",
+    "version": "3.0.0-rc1",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [
+          {
+            "name": "init_value",
+            "type": {
+              "displayName": [
+                "i32"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "name": [
+          "new"
+        ],
+        "selector": "0xd183512b"
+      },
+      {
+        "args": [],
+        "docs": [],
+        "name": [
+          "default"
+        ],
+        "selector": "0x6a3712e2"
+      }
+    ],
+    "docs": [],
+    "events": [],
+    "messages": [
+      {
+        "args": [
+          {
+            "name": "by",
+            "type": {
+              "displayName": [
+                "i32"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "mutates": true,
+        "name": [
+          "inc"
+        ],
+        "payable": false,
+        "returnType": null,
+        "selector": "0x2fb8d143"
+      },
+      {
+        "args": [],
+        "docs": [],
+        "mutates": false,
+        "name": [
+          "get"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "i32"
+          ],
+          "type": 1
+        },
+        "selector": "0x1e5ca456"
+      }
+    ]
+  },
+  "storage": {
+    "struct": {
+      "fields": [
+        {
+          "layout": {
+            "cell": {
+              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+              "ty": 1
+            }
+          },
+          "name": "value"
+        }
+      ]
+    }
+  },
+  "types": [
+    {
+      "def": {
+        "primitive": "i32"
+      }
+    }
+  ]
+}

packages/api-contract/src/test/contracts/ink/v0/index.ts

@@ -0,0 +1,11 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export { default as delegator } from './delegator.json' assert { type: 'json' };
+export { default as dns } from './dns.json' assert { type: 'json' };
+export { default as erc20 } from './erc20.json' assert { type: 'json' };
+export { default as erc721 } from './erc721.json' assert { type: 'json' };
+export { default as flipperBundle } from './flipper.contract.json' assert { type: 'json' };
+export { default as flipper } from './flipper.json' assert { type: 'json' };
+export { default as incrementer } from './incrementer.json' assert { type: 'json' };
+export { default as multisigPlain } from './multisig_plain.json' assert { type: 'json' };

packages/api-contract/src/test/contracts/ink/v0/trait-flipper.json

@@ -0,0 +1,103 @@
+{
+  "metadataVersion": "0.1.0",
+  "source": {
+    "hash": "0x568432b99f4ebd39ec03c2caaf69992b248999cc857326174b220b5587c3515f",
+    "language": "ink! 3.0.0-rc1",
+    "compiler": "rustc 1.48.0-nightly"
+  },
+  "contract": {
+    "name": "flipper",
+    "version": "3.0.0-rc1",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [],
+        "docs": [
+          " Creates a new flipper smart contract initialized to `false`."
+        ],
+        "name": [
+          "default"
+        ],
+        "selector": "0x6a3712e2"
+      },
+      {
+        "args": [
+          {
+            "name": "init_value",
+            "type": {
+              "displayName": [
+                "bool"
+              ],
+              "type": 1
+            }
+          }
+        ],
+        "docs": [],
+        "name": [
+          "Flip",
+          "new"
+        ],
+        "selector": "0x818482e7"
+      }
+    ],
+    "docs": [],
+    "events": [],
+    "messages": [
+      {
+        "args": [],
+        "docs": [],
+        "mutates": true,
+        "name": [
+          "Flip",
+          "flip"
+        ],
+        "payable": false,
+        "returnType": null,
+        "selector": "0xad931d5f"
+      },
+      {
+        "args": [],
+        "docs": [],
+        "mutates": false,
+        "name": [
+          "Flip",
+          "get"
+        ],
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "bool"
+          ],
+          "type": 1
+        },
+        "selector": "0x6b3549bc"
+      }
+    ]
+  },
+  "storage": {
+    "struct": {
+      "fields": [
+        {
+          "layout": {
+            "cell": {
+              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+              "ty": 1
+            }
+          },
+          "name": "value"
+        }
+      ]
+    }
+  },
+  "types": [
+    {
+      "def": {
+        "primitive": "bool"
+      }
+    }
+  ]
+}

packages/api-contract/src/test/contracts/ink/v1/flipper.contract.json

@@ -0,0 +1,111 @@
+{
+  "source": {
+    "hash": "0x7c5ff777929185b2350605e8f0163bfa25781097ad9ee2704c67021962720135",
+    "language": "ink! 3.0.0-rc5",
+    "compiler": "rustc 1.57.0-nightly",
+    "wasm": "0x0061736d01000000012b0860027f7f0060037f7f7f0060017f017f60000060037f7f7f017f60017f0060047f7f7f7f0060017f017e02880106057365616c30107365616c5f6765745f73746f726167650004057365616c30107365616c5f7365745f73746f726167650001057365616c30167365616c5f76616c75655f7472616e736665727265640000057365616c300a7365616c5f696e7075740000057365616c300b7365616c5f72657475726e000103656e76066d656d6f727902010210030e0d020002000100070603020304050608017f01418080040b071102066465706c6f79000d0463616c6c000f0ac60f0dc60101017f230041406a22012400200141206a200041186a290300370300200141186a200041106a290300370300200141106a200041086a2903003703002001420137032820012000290300370308200141808001360234200141808004360230200141808001360238200141086a41808004200141386a10002100200141306a2001280238100602400240024020000e0402000001000b000b000b20012001290330370338200141386a100741ff017122004102470440200141406b240020004100470f0b000b3101017f230041106b22022400200241086a200120002802002000280204100c20002002290308370200200241106a24000b4201027f230041106b22012400200141086a2000100a20012d0009210020012d00082102200141106a240041024101410220004101461b410020001b20024101711b0b8d0101017f230041406a22022400200241206a200141186a290300370300200241186a200141106a290300370300200241106a200141086a2903003703002002420137032820022001290300370308200241386a41808001360200200241808004360234200241003602302002200241306a20001009200241086a200228020020022802041001200241406b24000b9d0101037f230041106b22032400200141086a220428020021052004410036020020012802042104200141808004360204200320023a000f2003410120042005100c024020032802044101460440200328020020032d000f3a0000200141003602082001418080043602042005450d012001200541016b3602082001200441016a3602042000410136020420002004360200200341106a24000f0b000b000b3f01027f230041106b22022400200241003a000f200020012002410f6a410110102201047f41000520022d000f0b3a0001200020013a0000200241106a24000b900102027f017e230041106b220124002001420037030841042102027f02400340200241084604402001410436020820012903082203a741044f0d02000b20012000100a20012d0000410171450440200141086a20026a20012d00013a0000200241016a21020c010b0b4101210241000c010b410021022003422088a70b2100200141106a24002002ad2000ad420886840b1a00200120034d044020002001360204200020023602000f0b000b11004100100e41ff01714108470440000b0ba80602057f017e230041306b22012400027f02400240200045044020014180800136020c200141808004360208200141086a10112001200129030837031041032100200141106a100b2206a722034101710d02200642ffffffffff1f832206422088a721022006421888a721002006421088a721040240200341087641ff01712203419b01470440200341ed01460d010c030b200441ff017141ae0147200041ff0171419d014772200241de0047720d024103200141106a100741ff0171220020004102461b21000c030b200441ff017141cb0047200041ff0171419d0147720d01410221002002411b470d010c020b20014180800136020c200141808004360208200141086a101120012001290308370310410121020240200141106a100b2206a722054101710440410121000c010b200642ffffffffff1f832206422088a721042006421888a721002006421088a721030240200541087641ff01712205412f470440200541e30047200341ff0171413a4772200041ff017141a50147720d0141002100200441d100470d010c020b200341ff017141860147200041ff017141db0047720d004100210041002102200441d901460d010b41012100410121020b410620000d021a20020440200141286a4200370300200141206a4200370300200141186a420037030020014200370310200141106a1005410173200141106a100841080c030b200141286a4200370300200141206a4200370300200141186a4200370300200142003703102001200141106a10053a0008230041106b220024002000200141086a36020c2000410c6a2802002d00002101230041206b22002400200041186a4180800136020020004180800436021420004100360210200041086a200041106a2001100941002000280208200028020c1004000b410321000b4106200041034622020d001a4106200020021b22004102470440200141286a4200370300200141206a4200370300200141186a4200370300200142003703102000410171200141106a100841080c010b200141286a4200370300200141206a4200370300200141186a4200370300200142003703104100200141106a100841080b200141306a24000ba30102037f017e230041206b2200240020004180800136020420004180800436020020004180800136021041808004200041106a100220002000280210100620002000290300370308200041186a22014200370300200042003703100240200041086a200041106a411010102202047e4200052000290310210320012903000b20038450452002724504404101100e41ff01714108470d01200041206a24000f0b000b000b5701057f200028020422042002492205450440200028020022062107034020022003470440200120036a200320076a2d00003a0000200341016a21030c010b0b2000200420026b3602042000200220066a3602000b20050b3301017f230041106b220124002001200028020436020c20002802002001410c6a10032000200128020c1006200141106a24000b"
+  },
+  "contract": {
+    "name": "flipper",
+    "version": "3.0.0-rc5",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "V1": {
+    "spec": {
+      "constructors": [
+        {
+          "args": [
+            {
+              "name": "init_value",
+              "type": {
+                "displayName": [
+                  "bool"
+                ],
+                "type": 0
+              }
+            }
+          ],
+          "docs": [
+            "Creates a new flipper smart contract initialized with the given value."
+          ],
+          "name": [
+            "new"
+          ],
+          "selector": "0x9bae9d5e"
+        },
+        {
+          "args": [],
+          "docs": [
+            "Creates a new flipper smart contract initialized to `false`."
+          ],
+          "name": [
+            "default"
+          ],
+          "selector": "0xed4b9d1b"
+        }
+      ],
+      "docs": [],
+      "events": [],
+      "messages": [
+        {
+          "args": [],
+          "docs": [
+            " Flips the current value of the Flipper's boolean."
+          ],
+          "mutates": true,
+          "name": [
+            "flip"
+          ],
+          "payable": false,
+          "returnType": null,
+          "selector": "0x633aa551"
+        },
+        {
+          "args": [],
+          "docs": [
+            " Returns the current value of the Flipper's boolean."
+          ],
+          "mutates": false,
+          "name": [
+            "get"
+          ],
+          "payable": false,
+          "returnType": {
+            "displayName": [
+              "bool"
+            ],
+            "type": 0
+          },
+          "selector": "0x2f865bd9"
+        }
+      ]
+    },
+    "storage": {
+      "struct": {
+        "fields": [
+          {
+            "layout": {
+              "cell": {
+                "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+                "ty": 0
+              }
+            },
+            "name": "value"
+          }
+        ]
+      }
+    },
+    "types": [
+      {
+        "id": 0,
+        "type": {
+          "def": {
+            "primitive": "bool"
+          }
+        }
+      }
+    ]
+  }
+}

packages/api-contract/src/test/contracts/ink/v1/index.ts

@@ -0,0 +1,6 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export { default as flipper } from './flipper.contract.json' assert { type: 'json' };
+// A complex contract example with traits.
+export { default as psp22 } from './psp22_minter_pauser.contract.json' assert { type: 'json' };

packages/api-contract/src/test/contracts/ink/v2/index.ts

@@ -0,0 +1,5 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export { default as erc20 } from './erc20.contract.json' assert { type: 'json' };
+export { default as flipper } from './flipper.contract.json' assert { type: 'json' };

packages/api-contract/src/test/contracts/ink/v3/flipper.contract.json

@@ -0,0 +1,105 @@
+{
+  "source": {
+    "hash": "0xbb381c2fc980121b17c7b2bf2756d5964a12151cb846e0a9eff9cc337806456d",
+    "language": "ink! 3.0.0-rc7",
+    "compiler": "rustc 1.60.0-nightly",
+    "wasm": "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"
+  },
+  "contract": {
+    "name": "flipper",
+    "version": "3.0.0-rc7",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "V3": {
+    "spec": {
+      "constructors": [
+        {
+          "args": [
+            {
+              "label": "init_value",
+              "type": {
+                "displayName": [
+                  "bool"
+                ],
+                "type": 0
+              }
+            }
+          ],
+          "docs": [
+            "Creates a new flipper smart contract initialized with the given value."
+          ],
+          "label": "new",
+          "payable": false,
+          "selector": "0x9bae9d5e"
+        },
+        {
+          "args": [],
+          "docs": [
+            "Creates a new flipper smart contract initialized to `false`."
+          ],
+          "label": "default",
+          "payable": true,
+          "selector": "0xed4b9d1b"
+        }
+      ],
+      "docs": [],
+      "events": [],
+      "messages": [
+        {
+          "args": [],
+          "docs": [
+            " Flips the current value of the Flipper's boolean."
+          ],
+          "label": "flip",
+          "mutates": true,
+          "payable": false,
+          "returnType": null,
+          "selector": "0x633aa551"
+        },
+        {
+          "args": [],
+          "docs": [
+            " Returns the current value of the Flipper's boolean."
+          ],
+          "label": "get",
+          "mutates": false,
+          "payable": false,
+          "returnType": {
+            "displayName": [
+              "bool"
+            ],
+            "type": 0
+          },
+          "selector": "0x2f865bd9"
+        }
+      ]
+    },
+    "storage": {
+      "struct": {
+        "fields": [
+          {
+            "layout": {
+              "cell": {
+                "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
+                "ty": 0
+              }
+            },
+            "name": "value"
+          }
+        ]
+      }
+    },
+    "types": [
+      {
+        "id": 0,
+        "type": {
+          "def": {
+            "primitive": "bool"
+          }
+        }
+      }
+    ]
+  }
+}

packages/api-contract/src/test/contracts/ink/v3/index.ts

@@ -0,0 +1,6 @@
+// Copyright 2017-2025 @pezkuwi/api-contract authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export { default as flipper } from './flipper.contract.json' assert { type: 'json' };
+// A complex contract example with traits.
+export { default as traitErc20 } from './trait_erc20.contract.json' assert { type: 'json' };

packages/api-contract/src/test/contracts/ink/v4/erc20.json

@@ -0,0 +1,821 @@
+{
+  "source": {
+    "hash": "0x114f55289bcdfd0d28e0bbd1c63452b4e45901a022b1011d298fa2eb12d1711d",
+    "language": "ink! 4.3.0",
+    "compiler": "rustc 1.75.0",
+    "build_info": {
+      "build_mode": "Debug",
+      "cargo_contract_version": "3.2.0",
+      "rust_toolchain": "stable-aarch64-apple-darwin",
+      "wasm_opt_settings": {
+        "keep_debug_symbols": false,
+        "optimization_passes": "Z"
+      }
+    }
+  },
+  "contract": {
+    "name": "erc20",
+    "version": "4.3.0",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [
+          {
+            "label": "total_supply",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 0
+            }
+          }
+        ],
+        "default": false,
+        "docs": [
+          "Creates a new ERC-20 contract with the specified initial supply."
+        ],
+        "label": "new",
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink_primitives",
+            "ConstructorResult"
+          ],
+          "type": 1
+        },
+        "selector": "0x9bae9d5e"
+      }
+    ],
+    "docs": [],
+    "environment": {
+      "accountId": {
+        "displayName": [
+          "AccountId"
+        ],
+        "type": 5
+      },
+      "balance": {
+        "displayName": [
+          "Balance"
+        ],
+        "type": 0
+      },
+      "blockNumber": {
+        "displayName": [
+          "BlockNumber"
+        ],
+        "type": 14
+      },
+      "chainExtension": {
+        "displayName": [
+          "ChainExtension"
+        ],
+        "type": 15
+      },
+      "hash": {
+        "displayName": [
+          "Hash"
+        ],
+        "type": 12
+      },
+      "maxEventTopics": 4,
+      "timestamp": {
+        "displayName": [
+          "Timestamp"
+        ],
+        "type": 13
+      }
+    },
+    "events": [
+      {
+        "args": [
+          {
+            "docs": [],
+            "indexed": true,
+            "label": "from",
+            "type": {
+              "displayName": [
+                "Option"
+              ],
+              "type": 11
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "label": "to",
+            "type": {
+              "displayName": [
+                "Option"
+              ],
+              "type": 11
+            }
+          },
+          {
+            "docs": [],
+            "indexed": false,
+            "label": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 0
+            }
+          }
+        ],
+        "docs": [
+          "Event emitted when a token transfer occurs."
+        ],
+        "label": "Transfer"
+      },
+      {
+        "args": [
+          {
+            "docs": [],
+            "indexed": true,
+            "label": "owner",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "docs": [],
+            "indexed": true,
+            "label": "spender",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "docs": [],
+            "indexed": false,
+            "label": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 0
+            }
+          }
+        ],
+        "docs": [
+          "Event emitted when an approval occurs that `spender` is allowed to withdraw",
+          "up to the amount of `value` tokens from `owner`."
+        ],
+        "label": "Approval"
+      }
+    ],
+    "lang_error": {
+      "displayName": [
+        "ink",
+        "LangError"
+      ],
+      "type": 3
+    },
+    "messages": [
+      {
+        "args": [],
+        "default": false,
+        "docs": [
+          " Returns the total token supply."
+        ],
+        "label": "total_supply",
+        "mutates": false,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 4
+        },
+        "selector": "0xdb6375a8"
+      },
+      {
+        "args": [
+          {
+            "label": "owner",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          }
+        ],
+        "default": false,
+        "docs": [
+          " Returns the account balance for the specified `owner`.",
+          "",
+          " Returns `0` if the account is non-existent."
+        ],
+        "label": "balance_of",
+        "mutates": false,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 4
+        },
+        "selector": "0x0f755a56"
+      },
+      {
+        "args": [
+          {
+            "label": "owner",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "label": "spender",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          }
+        ],
+        "default": false,
+        "docs": [
+          " Returns the amount which `spender` is still allowed to withdraw from `owner`.",
+          "",
+          " Returns `0` if no allowance has been set."
+        ],
+        "label": "allowance",
+        "mutates": false,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 4
+        },
+        "selector": "0x6a00165e"
+      },
+      {
+        "args": [
+          {
+            "label": "to",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "label": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 0
+            }
+          }
+        ],
+        "default": false,
+        "docs": [
+          " Transfers `value` amount of tokens from the caller's account to account `to`.",
+          "",
+          " On success a `Transfer` event is emitted.",
+          "",
+          " # Errors",
+          "",
+          " Returns `InsufficientBalance` error if there are not enough tokens on",
+          " the caller's account balance."
+        ],
+        "label": "transfer",
+        "mutates": true,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 8
+        },
+        "selector": "0x84a15da1"
+      },
+      {
+        "args": [
+          {
+            "label": "spender",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "label": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 0
+            }
+          }
+        ],
+        "default": false,
+        "docs": [
+          " Allows `spender` to withdraw from the caller's account multiple times, up to",
+          " the `value` amount.",
+          "",
+          " If this function is called again it overwrites the current allowance with",
+          " `value`.",
+          "",
+          " An `Approval` event is emitted."
+        ],
+        "label": "approve",
+        "mutates": true,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 8
+        },
+        "selector": "0x681266a0"
+      },
+      {
+        "args": [
+          {
+            "label": "from",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "label": "to",
+            "type": {
+              "displayName": [
+                "AccountId"
+              ],
+              "type": 5
+            }
+          },
+          {
+            "label": "value",
+            "type": {
+              "displayName": [
+                "Balance"
+              ],
+              "type": 0
+            }
+          }
+        ],
+        "default": false,
+        "docs": [
+          " Transfers `value` tokens on the behalf of `from` to the account `to`.",
+          "",
+          " This can be used to allow a contract to transfer tokens on ones behalf and/or",
+          " to charge fees in sub-currencies, for example.",
+          "",
+          " On success a `Transfer` event is emitted.",
+          "",
+          " # Errors",
+          "",
+          " Returns `InsufficientAllowance` error if there are not enough tokens allowed",
+          " for the caller to withdraw from `from`.",
+          "",
+          " Returns `InsufficientBalance` error if there are not enough tokens on",
+          " the account balance of `from`."
+        ],
+        "label": "transfer_from",
+        "mutates": true,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 8
+        },
+        "selector": "0x0b396f18"
+      }
+    ]
+  },
+  "storage": {
+    "root": {
+      "layout": {
+        "struct": {
+          "fields": [
+            {
+              "layout": {
+                "leaf": {
+                  "key": "0x00000000",
+                  "ty": 0
+                }
+              },
+              "name": "total_supply"
+            },
+            {
+              "layout": {
+                "root": {
+                  "layout": {
+                    "leaf": {
+                      "key": "0x2623dce7",
+                      "ty": 0
+                    }
+                  },
+                  "root_key": "0x2623dce7"
+                }
+              },
+              "name": "balances"
+            },
+            {
+              "layout": {
+                "root": {
+                  "layout": {
+                    "leaf": {
+                      "key": "0xeca021b7",
+                      "ty": 0
+                    }
+                  },
+                  "root_key": "0xeca021b7"
+                }
+              },
+              "name": "allowances"
+            }
+          ],
+          "name": "Erc20"
+        }
+      },
+      "root_key": "0x00000000"
+    }
+  },
+  "types": [
+    {
+      "id": 0,
+      "type": {
+        "def": {
+          "primitive": "u128"
+        }
+      }
+    },
+    {
+      "id": 1,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 2
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 3
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 2
+          },
+          {
+            "name": "E",
+            "type": 3
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 2,
+      "type": {
+        "def": {
+          "tuple": []
+        }
+      }
+    },
+    {
+      "id": 3,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "index": 1,
+                "name": "CouldNotReadInput"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "LangError"
+        ]
+      }
+    },
+    {
+      "id": 4,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 0
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 3
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 0
+          },
+          {
+            "name": "E",
+            "type": 3
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 5,
+      "type": {
+        "def": {
+          "composite": {
+            "fields": [
+              {
+                "type": 6,
+                "typeName": "[u8; 32]"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "types",
+          "AccountId"
+        ]
+      }
+    },
+    {
+      "id": 6,
+      "type": {
+        "def": {
+          "array": {
+            "len": 32,
+            "type": 7
+          }
+        }
+      }
+    },
+    {
+      "id": 7,
+      "type": {
+        "def": {
+          "primitive": "u8"
+        }
+      }
+    },
+    {
+      "id": 8,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 9
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 3
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 9
+          },
+          {
+            "name": "E",
+            "type": 3
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 9,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 2
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 10
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 2
+          },
+          {
+            "name": "E",
+            "type": 10
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 10,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "index": 0,
+                "name": "InsufficientBalance"
+              },
+              {
+                "index": 1,
+                "name": "InsufficientAllowance"
+              }
+            ]
+          }
+        },
+        "path": [
+          "erc20",
+          "erc20",
+          "Error"
+        ]
+      }
+    },
+    {
+      "id": 11,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "index": 0,
+                "name": "None"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 5
+                  }
+                ],
+                "index": 1,
+                "name": "Some"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 5
+          }
+        ],
+        "path": [
+          "Option"
+        ]
+      }
+    },
+    {
+      "id": 12,
+      "type": {
+        "def": {
+          "composite": {
+            "fields": [
+              {
+                "type": 6,
+                "typeName": "[u8; 32]"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "types",
+          "Hash"
+        ]
+      }
+    },
+    {
+      "id": 13,
+      "type": {
+        "def": {
+          "primitive": "u64"
+        }
+      }
+    },
+    {
+      "id": 14,
+      "type": {
+        "def": {
+          "primitive": "u32"
+        }
+      }
+    },
+    {
+      "id": 15,
+      "type": {
+        "def": {
+          "variant": {}
+        },
+        "path": [
+          "ink_env",
+          "types",
+          "NoChainExtension"
+        ]
+      }
+    }
+  ],
+  "version": "4"
+}

packages/api-contract/src/test/contracts/ink/v4/flipper.json

@@ -0,0 +1,396 @@
+{
+  "source": {
+    "hash": "0xa5b19cb655755feba8e34ab5b413ac6593ecc7e24e19af485a4d30036be9d577",
+    "language": "ink! 4.2.0",
+    "compiler": "rustc 1.69.0",
+    "build_info": {
+      "build_mode": "Debug",
+      "cargo_contract_version": "2.2.1",
+      "rust_toolchain": "stable-x86_64-apple-darwin",
+      "wasm_opt_settings": {
+        "keep_debug_symbols": false,
+        "optimization_passes": "Z"
+      }
+    }
+  },
+  "contract": {
+    "name": "flipper",
+    "version": "4.2.0",
+    "authors": [
+      "Parity Technologies <admin@parity.io>"
+    ]
+  },
+  "spec": {
+    "constructors": [
+      {
+        "args": [
+          {
+            "label": "init_value",
+            "type": {
+              "displayName": [
+                "bool"
+              ],
+              "type": 0
+            }
+          }
+        ],
+        "default": false,
+        "docs": [
+          "Creates a new flipper smart contract initialized with the given value."
+        ],
+        "label": "new",
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink_primitives",
+            "ConstructorResult"
+          ],
+          "type": 1
+        },
+        "selector": "0x9bae9d5e"
+      },
+      {
+        "args": [],
+        "default": false,
+        "docs": [
+          "Creates a new flipper smart contract initialized to `false`."
+        ],
+        "label": "new_default",
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink_primitives",
+            "ConstructorResult"
+          ],
+          "type": 1
+        },
+        "selector": "0x61ef7e3e"
+      }
+    ],
+    "docs": [],
+    "environment": {
+      "accountId": {
+        "displayName": [
+          "AccountId"
+        ],
+        "type": 5
+      },
+      "balance": {
+        "displayName": [
+          "Balance"
+        ],
+        "type": 8
+      },
+      "blockNumber": {
+        "displayName": [
+          "BlockNumber"
+        ],
+        "type": 11
+      },
+      "chainExtension": {
+        "displayName": [
+          "ChainExtension"
+        ],
+        "type": 12
+      },
+      "hash": {
+        "displayName": [
+          "Hash"
+        ],
+        "type": 9
+      },
+      "maxEventTopics": 4,
+      "timestamp": {
+        "displayName": [
+          "Timestamp"
+        ],
+        "type": 10
+      }
+    },
+    "events": [],
+    "lang_error": {
+      "displayName": [
+        "ink",
+        "LangError"
+      ],
+      "type": 3
+    },
+    "messages": [
+      {
+        "args": [],
+        "default": false,
+        "docs": [
+          " Flips the current value of the Flipper's boolean."
+        ],
+        "label": "flip",
+        "mutates": true,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 1
+        },
+        "selector": "0x633aa551"
+      },
+      {
+        "args": [],
+        "default": false,
+        "docs": [
+          " Returns the current value of the Flipper's boolean."
+        ],
+        "label": "get",
+        "mutates": false,
+        "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 4
+        },
+        "selector": "0x2f865bd9"
+      }
+    ]
+  },
+  "storage": {
+    "root": {
+      "layout": {
+        "struct": {
+          "fields": [
+            {
+              "layout": {
+                "leaf": {
+                  "key": "0x00000000",
+                  "ty": 0
+                }
+              },
+              "name": "value"
+            }
+          ],
+          "name": "Flipper"
+        }
+      },
+      "root_key": "0x00000000"
+    }
+  },
+  "types": [
+    {
+      "id": 0,
+      "type": {
+        "def": {
+          "primitive": "bool"
+        }
+      }
+    },
+    {
+      "id": 1,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 2
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 3
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 2
+          },
+          {
+            "name": "E",
+            "type": 3
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 2,
+      "type": {
+        "def": {
+          "tuple": []
+        }
+      }
+    },
+    {
+      "id": 3,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "index": 1,
+                "name": "CouldNotReadInput"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "LangError"
+        ]
+      }
+    },
+    {
+      "id": 4,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 0
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 3
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 0
+          },
+          {
+            "name": "E",
+            "type": 3
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 5,
+      "type": {
+        "def": {
+          "composite": {
+            "fields": [
+              {
+                "type": 6,
+                "typeName": "[u8; 32]"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "types",
+          "AccountId"
+        ]
+      }
+    },
+    {
+      "id": 6,
+      "type": {
+        "def": {
+          "array": {
+            "len": 32,
+            "type": 7
+          }
+        }
+      }
+    },
+    {
+      "id": 7,
+      "type": {
+        "def": {
+          "primitive": "u8"
+        }
+      }
+    },
+    {
+      "id": 8,
+      "type": {
+        "def": {
+          "primitive": "u128"
+        }
+      }
+    },
+    {
+      "id": 9,
+      "type": {
+        "def": {
+          "composite": {
+            "fields": [
+              {
+                "type": 6,
+                "typeName": "[u8; 32]"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "types",
+          "Hash"
+        ]
+      }
+    },
+    {
+      "id": 10,
+      "type": {
+        "def": {
+          "primitive": "u64"
+        }
+      }
+    },
+    {
+      "id": 11,
+      "type": {
+        "def": {
+          "primitive": "u32"
+        }
+      }
+    },
+    {
+      "id": 12,
+      "type": {
+        "def": {
+          "variant": {}
+        },
+        "path": [
+          "ink_env",
+          "types",
+          "NoChainExtension"
+        ]
+      }
+    }
+  ],
+  "version": "4"
+}