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Egor_P
ddb53c87f5
This PR backports `spec_version`, `node_version` bumps and reordering of the prdocs from the 1.10.0 release branch
27 lines
1.4 KiB
Plaintext
27 lines
1.4 KiB
Plaintext
# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
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# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
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title: "XCM fee payment API"
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doc:
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- audience: Runtime Dev
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description: |
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A runtime API was added for estimating the fees required for XCM execution and delivery.
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This is the basic building block needed for UIs to accurately estimate fees.
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An example implementation is shown in the PR. Ideally it's simple to implement, you only need to call existing parts of your XCM config.
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The API looks like so:
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```rust
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fn query_acceptable_payment_assets(xcm_version: Version) -> Result<Vec<VersionedAssetId>, Error>;
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fn query_xcm_weight(message: VersionedXcm<Call>) -> Result<Weight, Error>;
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fn query_weight_to_asset_fee(weight: Weight, asset: VersionedAssetId) -> Result<u128, Error>;
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fn query_delivery_fees(destination: VersionedLocation, message: VersionedXcm<()>) -> Result<VersionedAssets, Error>;
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```
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The first three relate to XCM execution fees, given an XCM, you can query its weight, then which assets are acceptable for buying weight and convert weight to a number of those assets.
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The last one takes in a destination and a message you want to send from the runtime you're executing this on, it will give you the delivery fees.
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crates:
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- name: xcm-fee-payment-runtime-api
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- name: rococo-runtime
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- name: westend-runtime
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