Buy&Sell methods for Uniques (#11398)

* Allow to set item's price

* Clean the state when we transfer/burn an item or destroy a collection

* Allow to buy an item

* Remove redundant checks

* Improve events

* Cover with tests

* Add comments

* Apply suggestions

* Fmt

* Improvements for price validation

* Improve validation

* Update to use the new terminology

* Remove multi-assets support

* Chore

* Weights + benchmarking

* Shield against human error

* Test when we pass the higher item's price

* fmt fix

* Chore

* cargo run --quiet --profile=production  --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark pallet --chain=dev --steps=50 --repeat=20 --pallet=pallet_uniques --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/uniques/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Remove is_frozen check when setting the price

* Try to fix benchmarking

* Fix benchmarking

* cargo run --quiet --profile=production  --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark pallet --chain=dev --steps=50 --repeat=20 --pallet=pallet_uniques --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/uniques/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Add transactional

* Add 'allow deprecated' flag for transactional

* Remove #[allow(deprecated)]

* ".git/.scripts/bench-bot.sh" pallet dev pallet_uniques

Co-authored-by: Parity Bot <admin@parity.io>
Co-authored-by: command-bot <>

substrate/frame/uniques/src/benchmarking.rs

@@ -408,5 +408,41 @@ benchmarks_instance_pallet! {
 		}.into());
 	}
 
+	set_price {
+		let (collection, caller, _) = create_collection::<T, I>();
+		let (item, ..) = mint_item::<T, I>(0);
+		let delegate: T::AccountId = account("delegate", 0, SEED);
+		let delegate_lookup = T::Lookup::unlookup(delegate.clone());
+		let price = ItemPrice::<T, I>::from(100u32);
+	}: _(SystemOrigin::Signed(caller.clone()), collection, item, Some(price), Some(delegate_lookup))
+	verify {
+		assert_last_event::<T, I>(Event::ItemPriceSet {
+			collection,
+			item,
+			price,
+			whitelisted_buyer: Some(delegate),
+		}.into());
+	}
+
+	buy_item {
+		let (collection, seller, _) = create_collection::<T, I>();
+		let (item, ..) = mint_item::<T, I>(0);
+		let buyer: T::AccountId = account("buyer", 0, SEED);
+		let buyer_lookup = T::Lookup::unlookup(buyer.clone());
+		let price = ItemPrice::<T, I>::from(0u32);
+		let origin = SystemOrigin::Signed(seller.clone()).into();
+		Uniques::<T, I>::set_price(origin, collection, item, Some(price.clone()), Some(buyer_lookup))?;
+		T::Currency::make_free_balance_be(&buyer, DepositBalanceOf::<T, I>::max_value());
+	}: _(SystemOrigin::Signed(buyer.clone()), collection, item, price.clone())
+	verify {
+		assert_last_event::<T, I>(Event::ItemBought {
+			collection,
+			item,
+			price,
+			seller,
+			buyer,
+		}.into());
+	}
+
 	impl_benchmark_test_suite!(Uniques, crate::mock::new_test_ext(), crate::mock::Test);
 }

substrate/frame/uniques/src/functions.rs

@@ -18,7 +18,10 @@
 //! Various pieces of common functionality.
 
 use super::*;
-use frame_support::{ensure, traits::Get};
+use frame_support::{
+	ensure,
+	traits::{ExistenceRequirement, Get},
+};
 use sp_runtime::{DispatchError, DispatchResult};
 
 impl<T: Config<I>, I: 'static> Pallet<T, I> {
@@ -46,6 +49,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		let origin = details.owner;
 		details.owner = dest;
 		Item::<T, I>::insert(&collection, &item, &details);
+		ItemPriceOf::<T, I>::remove(&collection, &item);
 
 		Self::deposit_event(Event::Transferred {
 			collection,
@@ -112,6 +116,8 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 			}
 			#[allow(deprecated)]
 			ItemMetadataOf::<T, I>::remove_prefix(&collection, None);
+			#[allow(deprecated)]
+			ItemPriceOf::<T, I>::remove_prefix(&collection, None);
 			CollectionMetadataOf::<T, I>::remove(&collection);
 			#[allow(deprecated)]
 			Attribute::<T, I>::remove_prefix((&collection,), None);
@@ -196,8 +202,79 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 
 		Item::<T, I>::remove(&collection, &item);
 		Account::<T, I>::remove((&owner, &collection, &item));
+		ItemPriceOf::<T, I>::remove(&collection, &item);
 
 		Self::deposit_event(Event::Burned { collection, item, owner });
 		Ok(())
 	}
+
+	pub fn do_set_price(
+		collection: T::CollectionId,
+		item: T::ItemId,
+		sender: T::AccountId,
+		price: Option<ItemPrice<T, I>>,
+		whitelisted_buyer: Option<T::AccountId>,
+	) -> DispatchResult {
+		let details = Item::<T, I>::get(&collection, &item).ok_or(Error::<T, I>::UnknownItem)?;
+		ensure!(details.owner == sender, Error::<T, I>::NoPermission);
+
+		if let Some(ref price) = price {
+			ItemPriceOf::<T, I>::insert(
+				&collection,
+				&item,
+				(price.clone(), whitelisted_buyer.clone()),
+			);
+			Self::deposit_event(Event::ItemPriceSet {
+				collection,
+				item,
+				price: price.clone(),
+				whitelisted_buyer,
+			});
+		} else {
+			ItemPriceOf::<T, I>::remove(&collection, &item);
+			Self::deposit_event(Event::ItemPriceRemoved { collection, item });
+		}
+
+		Ok(())
+	}
+
+	pub fn do_buy_item(
+		collection: T::CollectionId,
+		item: T::ItemId,
+		buyer: T::AccountId,
+		bid_price: ItemPrice<T, I>,
+	) -> DispatchResult {
+		let details = Item::<T, I>::get(&collection, &item).ok_or(Error::<T, I>::UnknownItem)?;
+		ensure!(details.owner != buyer, Error::<T, I>::NoPermission);
+
+		let price_info =
+			ItemPriceOf::<T, I>::get(&collection, &item).ok_or(Error::<T, I>::NotForSale)?;
+
+		ensure!(bid_price >= price_info.0, Error::<T, I>::BidTooLow);
+
+		if let Some(only_buyer) = price_info.1 {
+			ensure!(only_buyer == buyer, Error::<T, I>::NoPermission);
+		}
+
+		T::Currency::transfer(
+			&buyer,
+			&details.owner,
+			price_info.0,
+			ExistenceRequirement::KeepAlive,
+		)?;
+
+		let old_owner = details.owner.clone();
+
+		Self::do_transfer(collection, item, buyer.clone(), |_, _| Ok(()))?;
+
+		Self::deposit_event(Event::ItemBought {
+			collection,
+			item,
+			price: price_info.0,
+			seller: old_owner,
+			buyer,
+		});
+
+		Ok(())
+	}
 }

substrate/frame/uniques/src/lib.rs

@@ -24,6 +24,7 @@
 //! * [`System`](../frame_system/index.html)
 //! * [`Support`](../frame_support/index.html)
 
+#![recursion_limit = "256"]
 // Ensure we're `no_std` when compiling for Wasm.
 #![cfg_attr(not(feature = "std"), no_std)]
 
@@ -42,8 +43,11 @@ pub mod migration;
 pub mod weights;
 
 use codec::{Decode, Encode};
-use frame_support::traits::{
-	tokens::Locker, BalanceStatus::Reserved, Currency, EnsureOriginWithArg, ReservableCurrency,
+use frame_support::{
+	traits::{
+		tokens::Locker, BalanceStatus::Reserved, Currency, EnsureOriginWithArg, ReservableCurrency,
+	},
+	transactional,
 };
 use frame_system::Config as SystemConfig;
 use sp_runtime::{
@@ -245,6 +249,18 @@ pub mod pallet {
 		OptionQuery,
 	>;
 
+	#[pallet::storage]
+	/// Price of an asset instance.
+	pub(super) type ItemPriceOf<T: Config<I>, I: 'static = ()> = StorageDoubleMap<
+		_,
+		Blake2_128Concat,
+		T::CollectionId,
+		Blake2_128Concat,
+		T::ItemId,
+		(ItemPrice<T, I>, Option<T::AccountId>),
+		OptionQuery,
+	>;
+
 	#[pallet::storage]
 	/// Keeps track of the number of items a collection might have.
 	pub(super) type CollectionMaxSupply<T: Config<I>, I: 'static = ()> =
@@ -341,6 +357,23 @@ pub mod pallet {
 		OwnershipAcceptanceChanged { who: T::AccountId, maybe_collection: Option<T::CollectionId> },
 		/// Max supply has been set for a collection.
 		CollectionMaxSupplySet { collection: T::CollectionId, max_supply: u32 },
+		/// The price was set for the instance.
+		ItemPriceSet {
+			collection: T::CollectionId,
+			item: T::ItemId,
+			price: ItemPrice<T, I>,
+			whitelisted_buyer: Option<T::AccountId>,
+		},
+		/// The price for the instance was removed.
+		ItemPriceRemoved { collection: T::CollectionId, item: T::ItemId },
+		/// An item was bought.
+		ItemBought {
+			collection: T::CollectionId,
+			item: T::ItemId,
+			price: ItemPrice<T, I>,
+			seller: T::AccountId,
+			buyer: T::AccountId,
+		},
 	}
 
 	#[pallet::error]
@@ -375,6 +408,12 @@ pub mod pallet {
 		MaxSupplyAlreadySet,
 		/// The provided max supply is less to the amount of items a collection already has.
 		MaxSupplyTooSmall,
+		/// The given item ID is unknown.
+		UnknownItem,
+		/// Item is not for sale.
+		NotForSale,
+		/// The provided bid is too low.
+		BidTooLow,
 	}
 
 	impl<T: Config<I>, I: 'static> Pallet<T, I> {
@@ -1408,5 +1447,50 @@ pub mod pallet {
 			Self::deposit_event(Event::CollectionMaxSupplySet { collection, max_supply });
 			Ok(())
 		}
+
+		/// Set (or reset) the price for an item.
+		///
+		/// Origin must be Signed and must be the owner of the asset `item`.
+		///
+		/// - `collection`: The collection of the item.
+		/// - `item`: The item to set the price for.
+		/// - `price`: The price for the item. Pass `None`, to reset the price.
+		/// - `buyer`: Restricts the buy operation to a specific account.
+		///
+		/// Emits `ItemPriceSet` on success if the price is not `None`.
+		/// Emits `ItemPriceRemoved` on success if the price is `None`.
+		#[pallet::weight(T::WeightInfo::set_price())]
+		pub fn set_price(
+			origin: OriginFor<T>,
+			collection: T::CollectionId,
+			item: T::ItemId,
+			price: Option<ItemPrice<T, I>>,
+			whitelisted_buyer: Option<<T::Lookup as StaticLookup>::Source>,
+		) -> DispatchResult {
+			let origin = ensure_signed(origin)?;
+			let whitelisted_buyer = whitelisted_buyer.map(T::Lookup::lookup).transpose()?;
+			Self::do_set_price(collection, item, origin, price, whitelisted_buyer)
+		}
+
+		/// Allows to buy an item if it's up for sale.
+		///
+		/// Origin must be Signed and must not be the owner of the `item`.
+		///
+		/// - `collection`: The collection of the item.
+		/// - `item`: The item the sender wants to buy.
+		/// - `bid_price`: The price the sender is willing to pay.
+		///
+		/// Emits `ItemBought` on success.
+		#[pallet::weight(T::WeightInfo::buy_item())]
+		#[transactional]
+		pub fn buy_item(
+			origin: OriginFor<T>,
+			collection: T::CollectionId,
+			item: T::ItemId,
+			bid_price: ItemPrice<T, I>,
+		) -> DispatchResult {
+			let origin = ensure_signed(origin)?;
+			Self::do_buy_item(collection, item, origin, bid_price)
+		}
 	}
 }

substrate/frame/uniques/src/tests.rs

@@ -18,7 +18,7 @@
 //! Tests for Uniques pallet.
 
 use crate::{mock::*, Event, *};
-use frame_support::{assert_noop, assert_ok, traits::Currency};
+use frame_support::{assert_noop, assert_ok, dispatch::Dispatchable, traits::Currency};
 use pallet_balances::Error as BalancesError;
 use sp_std::prelude::*;
 
@@ -694,3 +694,179 @@ fn max_supply_should_work() {
 		assert!(!CollectionMaxSupply::<Test>::contains_key(collection_id));
 	});
 }
+
+#[test]
+fn set_price_should_work() {
+	new_test_ext().execute_with(|| {
+		let user_id = 1;
+		let collection_id = 0;
+		let item_1 = 1;
+		let item_2 = 2;
+
+		assert_ok!(Uniques::force_create(Origin::root(), collection_id, user_id, true));
+
+		assert_ok!(Uniques::mint(Origin::signed(user_id), collection_id, item_1, user_id));
+		assert_ok!(Uniques::mint(Origin::signed(user_id), collection_id, item_2, user_id));
+
+		assert_ok!(Uniques::set_price(
+			Origin::signed(user_id),
+			collection_id,
+			item_1,
+			Some(1),
+			None,
+		));
+
+		assert_ok!(Uniques::set_price(
+			Origin::signed(user_id),
+			collection_id,
+			item_2,
+			Some(2),
+			Some(3)
+		));
+
+		let item = ItemPriceOf::<Test>::get(collection_id, item_1).unwrap();
+		assert_eq!(item.0, 1);
+		assert_eq!(item.1, None);
+
+		let item = ItemPriceOf::<Test>::get(collection_id, item_2).unwrap();
+		assert_eq!(item.0, 2);
+		assert_eq!(item.1, Some(3));
+
+		assert!(events().contains(&Event::<Test>::ItemPriceSet {
+			collection: collection_id,
+			item: item_1,
+			price: 1,
+			whitelisted_buyer: None,
+		}));
+
+		// validate we can unset the price
+		assert_ok!(Uniques::set_price(Origin::signed(user_id), collection_id, item_2, None, None));
+		assert!(events().contains(&Event::<Test>::ItemPriceRemoved {
+			collection: collection_id,
+			item: item_2
+		}));
+		assert!(!ItemPriceOf::<Test>::contains_key(collection_id, item_2));
+	});
+}
+
+#[test]
+fn buy_item_should_work() {
+	new_test_ext().execute_with(|| {
+		let user_1 = 1;
+		let user_2 = 2;
+		let user_3 = 3;
+		let collection_id = 0;
+		let item_1 = 1;
+		let item_2 = 2;
+		let item_3 = 3;
+		let price_1 = 20;
+		let price_2 = 30;
+		let initial_balance = 100;
+
+		Balances::make_free_balance_be(&user_1, initial_balance);
+		Balances::make_free_balance_be(&user_2, initial_balance);
+		Balances::make_free_balance_be(&user_3, initial_balance);
+
+		assert_ok!(Uniques::force_create(Origin::root(), collection_id, user_1, true));
+
+		assert_ok!(Uniques::mint(Origin::signed(user_1), collection_id, item_1, user_1));
+		assert_ok!(Uniques::mint(Origin::signed(user_1), collection_id, item_2, user_1));
+		assert_ok!(Uniques::mint(Origin::signed(user_1), collection_id, item_3, user_1));
+
+		assert_ok!(Uniques::set_price(
+			Origin::signed(user_1),
+			collection_id,
+			item_1,
+			Some(price_1),
+			None,
+		));
+
+		assert_ok!(Uniques::set_price(
+			Origin::signed(user_1),
+			collection_id,
+			item_2,
+			Some(price_2),
+			Some(user_3),
+		));
+
+		// can't buy for less
+		assert_noop!(
+			Uniques::buy_item(Origin::signed(user_2), collection_id, item_1, 1),
+			Error::<Test>::BidTooLow
+		);
+
+		// pass the higher price to validate it will still deduct correctly
+		assert_ok!(Uniques::buy_item(Origin::signed(user_2), collection_id, item_1, price_1 + 1,));
+
+		// validate the new owner & balances
+		let item = Item::<Test>::get(collection_id, item_1).unwrap();
+		assert_eq!(item.owner, user_2);
+		assert_eq!(Balances::total_balance(&user_1), initial_balance + price_1);
+		assert_eq!(Balances::total_balance(&user_2), initial_balance - price_1);
+
+		// can't buy from yourself
+		assert_noop!(
+			Uniques::buy_item(Origin::signed(user_1), collection_id, item_2, price_2),
+			Error::<Test>::NoPermission
+		);
+
+		// can't buy when the item is listed for a specific buyer
+		assert_noop!(
+			Uniques::buy_item(Origin::signed(user_2), collection_id, item_2, price_2),
+			Error::<Test>::NoPermission
+		);
+
+		// can buy when I'm a whitelisted buyer
+		assert_ok!(Uniques::buy_item(Origin::signed(user_3), collection_id, item_2, price_2,));
+
+		assert!(events().contains(&Event::<Test>::ItemBought {
+			collection: collection_id,
+			item: item_2,
+			price: price_2,
+			seller: user_1,
+			buyer: user_3,
+		}));
+
+		// ensure we reset the buyer field
+		assert!(!ItemPriceOf::<Test>::contains_key(collection_id, item_2));
+
+		// can't buy when item is not for sale
+		assert_noop!(
+			Uniques::buy_item(Origin::signed(user_2), collection_id, item_3, price_2),
+			Error::<Test>::NotForSale
+		);
+
+		// ensure we can't buy an item when the collection or an item is frozen
+		{
+			assert_ok!(Uniques::set_price(
+				Origin::signed(user_1),
+				collection_id,
+				item_3,
+				Some(price_1),
+				None,
+			));
+
+			// freeze collection
+			assert_ok!(Uniques::freeze_collection(Origin::signed(user_1), collection_id));
+
+			let buy_item_call = mock::Call::Uniques(crate::Call::<Test>::buy_item {
+				collection: collection_id,
+				item: item_3,
+				bid_price: price_1,
+			});
+			assert_noop!(buy_item_call.dispatch(Origin::signed(user_2)), Error::<Test>::Frozen);
+
+			assert_ok!(Uniques::thaw_collection(Origin::signed(user_1), collection_id));
+
+			// freeze item
+			assert_ok!(Uniques::freeze(Origin::signed(user_1), collection_id, item_3));
+
+			let buy_item_call = mock::Call::Uniques(crate::Call::<Test>::buy_item {
+				collection: collection_id,
+				item: item_3,
+				bid_price: price_1,
+			});
+			assert_noop!(buy_item_call.dispatch(Origin::signed(user_2)), Error::<Test>::Frozen);
+		}
+	});
+}

substrate/frame/uniques/src/types.rs

@@ -30,6 +30,8 @@ pub(super) type CollectionDetailsFor<T, I> =
 	CollectionDetails<<T as SystemConfig>::AccountId, DepositBalanceOf<T, I>>;
 pub(super) type ItemDetailsFor<T, I> =
 	ItemDetails<<T as SystemConfig>::AccountId, DepositBalanceOf<T, I>>;
+pub(super) type ItemPrice<T, I = ()> =
+	<<T as Config<I>>::Currency as Currency<<T as SystemConfig>::AccountId>>::Balance;
 
 #[derive(Clone, Encode, Decode, Eq, PartialEq, RuntimeDebug, TypeInfo, MaxEncodedLen)]
 pub struct CollectionDetails<AccountId, DepositBalance> {

substrate/frame/uniques/src/weights.rs

@@ -18,22 +18,22 @@
 //! Autogenerated weights for pallet_uniques
 //!
 //! THIS FILE WAS AUTO-GENERATED USING THE SUBSTRATE BENCHMARK CLI VERSION 4.0.0-dev
-//! DATE: 2022-06-03, STEPS: `50`, REPEAT: 20, LOW RANGE: `[]`, HIGH RANGE: `[]`
-//! HOSTNAME: `bm3`, CPU: `Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz`
+//! DATE: 2022-07-13, STEPS: `50`, REPEAT: 20, LOW RANGE: `[]`, HIGH RANGE: `[]`
+//! HOSTNAME: `test-bench-bot`, CPU: `Intel(R) Xeon(R) CPU @ 3.10GHz`
 //! EXECUTION: Some(Wasm), WASM-EXECUTION: Compiled, CHAIN: Some("dev"), DB CACHE: 1024
 
 // Executed Command:
 // target/production/substrate
 // benchmark
 // pallet
-// --chain=dev
 // --steps=50
 // --repeat=20
-// --pallet=pallet_uniques
 // --extrinsic=*
 // --execution=wasm
 // --wasm-execution=compiled
 // --heap-pages=4096
+// --pallet=pallet_uniques
+// --chain=dev
 // --output=./frame/uniques/src/weights.rs
 // --template=./.maintain/frame-weight-template.hbs
 
@@ -70,6 +70,8 @@ pub trait WeightInfo {
 	fn cancel_approval() -> Weight;
 	fn set_accept_ownership() -> Weight;
 	fn set_collection_max_supply() -> Weight;
+	fn set_price() -> Weight;
+	fn buy_item() -> Weight;
 }
 
 /// Weights for pallet_uniques using the Substrate node and recommended hardware.
@@ -78,14 +80,14 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:1)
 	fn create() -> Weight {
-		(27_715_000 as Weight)
+		(33_075_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:1)
 	fn force_create() -> Weight {
-		(16_929_000 as Weight)
+		(19_528_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
@@ -102,12 +104,12 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 	/// The range of component `a` is `[0, 1000]`.
 	fn destroy(n: u32, m: u32, a: u32, ) -> Weight {
 		(0 as Weight)
-			// Standard Error: 16_000
-			.saturating_add((10_481_000 as Weight).saturating_mul(n as Weight))
-			// Standard Error: 16_000
-			.saturating_add((1_762_000 as Weight).saturating_mul(m as Weight))
-			// Standard Error: 16_000
-			.saturating_add((1_590_000 as Weight).saturating_mul(a as Weight))
+			// Standard Error: 25_000
+			.saturating_add((13_639_000 as Weight).saturating_mul(n as Weight))
+			// Standard Error: 25_000
+			.saturating_add((2_393_000 as Weight).saturating_mul(m as Weight))
+			// Standard Error: 25_000
+			.saturating_add((2_217_000 as Weight).saturating_mul(a as Weight))
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().reads((1 as Weight).saturating_mul(n as Weight)))
 			.saturating_add(T::DbWeight::get().writes(4 as Weight))
@@ -120,33 +122,35 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 	// Storage: Uniques CollectionMaxSupply (r:1 w:0)
 	// Storage: Uniques Account (r:0 w:1)
 	fn mint() -> Weight {
-		(36_577_000 as Weight)
+		(42_146_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(3 as Weight))
 			.saturating_add(T::DbWeight::get().writes(3 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Account (r:0 w:1)
+	// Storage: Uniques ItemPriceOf (r:0 w:1)
 	fn burn() -> Weight {
-		(36_124_000 as Weight)
+		(42_960_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
-			.saturating_add(T::DbWeight::get().writes(3 as Weight))
+			.saturating_add(T::DbWeight::get().writes(4 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Account (r:0 w:2)
+	// Storage: Uniques ItemPriceOf (r:0 w:1)
 	fn transfer() -> Weight {
-		(27_225_000 as Weight)
+		(33_025_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
-			.saturating_add(T::DbWeight::get().writes(3 as Weight))
+			.saturating_add(T::DbWeight::get().writes(4 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques Asset (r:100 w:100)
 	/// The range of component `i` is `[0, 5000]`.
 	fn redeposit(i: u32, ) -> Weight {
 		(0 as Weight)
-			// Standard Error: 14_000
-			.saturating_add((12_407_000 as Weight).saturating_mul(i as Weight))
+			// Standard Error: 24_000
+			.saturating_add((15_540_000 as Weight).saturating_mul(i as Weight))
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().reads((1 as Weight).saturating_mul(i as Weight)))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
@@ -155,26 +159,26 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Class (r:1 w:0)
 	fn freeze() -> Weight {
-		(21_452_000 as Weight)
+		(25_194_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Class (r:1 w:0)
 	fn thaw() -> Weight {
-		(22_155_000 as Weight)
+		(25_397_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	fn freeze_collection() -> Weight {
-		(16_897_000 as Weight)
+		(19_278_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	fn thaw_collection() -> Weight {
-		(16_657_000 as Weight)
+		(19_304_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
@@ -182,20 +186,20 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:2)
 	fn transfer_ownership() -> Weight {
-		(25_057_000 as Weight)
+		(28_615_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(4 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	fn set_team() -> Weight {
-		(17_253_000 as Weight)
+		(19_943_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:1)
 	fn force_item_status() -> Weight {
-		(20_010_000 as Weight)
+		(22_583_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
@@ -203,7 +207,7 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 	// Storage: Uniques InstanceMetadataOf (r:1 w:0)
 	// Storage: Uniques Attribute (r:1 w:1)
 	fn set_attribute() -> Weight {
-		(41_159_000 as Weight)
+		(47_520_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(3 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
@@ -211,65 +215,81 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 	// Storage: Uniques InstanceMetadataOf (r:1 w:0)
 	// Storage: Uniques Attribute (r:1 w:1)
 	fn clear_attribute() -> Weight {
-		(39_598_000 as Weight)
+		(45_316_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(3 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques InstanceMetadataOf (r:1 w:1)
 	fn set_metadata() -> Weight {
-		(33_387_000 as Weight)
+		(38_391_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques InstanceMetadataOf (r:1 w:1)
 	fn clear_metadata() -> Weight {
-		(33_208_000 as Weight)
+		(38_023_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassMetadataOf (r:1 w:1)
 	fn set_collection_metadata() -> Weight {
-		(32_619_000 as Weight)
+		(37_398_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques ClassMetadataOf (r:1 w:1)
 	fn clear_collection_metadata() -> Weight {
-		(31_028_000 as Weight)
+		(35_621_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques Asset (r:1 w:1)
 	fn approve_transfer() -> Weight {
-		(22_263_000 as Weight)
+		(25_856_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques Asset (r:1 w:1)
 	fn cancel_approval() -> Weight {
-		(22_910_000 as Weight)
+		(26_098_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques OwnershipAcceptance (r:1 w:1)
 	fn set_accept_ownership() -> Weight {
-		(20_716_000 as Weight)
+		(24_076_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(1 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques CollectionMaxSupply (r:1 w:1)
 	// Storage: Uniques Class (r:1 w:0)
 	fn set_collection_max_supply() -> Weight {
-		(19_380_000 as Weight)
+		(22_035_000 as Weight)
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(1 as Weight))
 	}
+	// Storage: Uniques Asset (r:1 w:0)
+	// Storage: Uniques ItemPriceOf (r:0 w:1)
+	fn set_price() -> Weight {
+		(22_534_000 as Weight)
+			.saturating_add(T::DbWeight::get().reads(1 as Weight))
+			.saturating_add(T::DbWeight::get().writes(1 as Weight))
+	}
+	// Storage: Uniques Asset (r:1 w:1)
+	// Storage: Uniques ItemPriceOf (r:1 w:1)
+	// Storage: Uniques Class (r:1 w:0)
+	// Storage: Uniques Account (r:0 w:2)
+	fn buy_item() -> Weight {
+		(45_272_000 as Weight)
+			.saturating_add(T::DbWeight::get().reads(3 as Weight))
+			.saturating_add(T::DbWeight::get().writes(4 as Weight))
+	}
 }
 
 // For backwards compatibility and tests
@@ -277,14 +297,14 @@ impl WeightInfo for () {
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:1)
 	fn create() -> Weight {
-		(27_715_000 as Weight)
+		(33_075_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:1)
 	fn force_create() -> Weight {
-		(16_929_000 as Weight)
+		(19_528_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
@@ -301,12 +321,12 @@ impl WeightInfo for () {
 	/// The range of component `a` is `[0, 1000]`.
 	fn destroy(n: u32, m: u32, a: u32, ) -> Weight {
 		(0 as Weight)
-			// Standard Error: 16_000
-			.saturating_add((10_481_000 as Weight).saturating_mul(n as Weight))
-			// Standard Error: 16_000
-			.saturating_add((1_762_000 as Weight).saturating_mul(m as Weight))
-			// Standard Error: 16_000
-			.saturating_add((1_590_000 as Weight).saturating_mul(a as Weight))
+			// Standard Error: 25_000
+			.saturating_add((13_639_000 as Weight).saturating_mul(n as Weight))
+			// Standard Error: 25_000
+			.saturating_add((2_393_000 as Weight).saturating_mul(m as Weight))
+			// Standard Error: 25_000
+			.saturating_add((2_217_000 as Weight).saturating_mul(a as Weight))
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().reads((1 as Weight).saturating_mul(n as Weight)))
 			.saturating_add(RocksDbWeight::get().writes(4 as Weight))
@@ -319,33 +339,35 @@ impl WeightInfo for () {
 	// Storage: Uniques CollectionMaxSupply (r:1 w:0)
 	// Storage: Uniques Account (r:0 w:1)
 	fn mint() -> Weight {
-		(36_577_000 as Weight)
+		(42_146_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(3 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(3 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Account (r:0 w:1)
+	// Storage: Uniques ItemPriceOf (r:0 w:1)
 	fn burn() -> Weight {
-		(36_124_000 as Weight)
+		(42_960_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
-			.saturating_add(RocksDbWeight::get().writes(3 as Weight))
+			.saturating_add(RocksDbWeight::get().writes(4 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Account (r:0 w:2)
+	// Storage: Uniques ItemPriceOf (r:0 w:1)
 	fn transfer() -> Weight {
-		(27_225_000 as Weight)
+		(33_025_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
-			.saturating_add(RocksDbWeight::get().writes(3 as Weight))
+			.saturating_add(RocksDbWeight::get().writes(4 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques Asset (r:100 w:100)
 	/// The range of component `i` is `[0, 5000]`.
 	fn redeposit(i: u32, ) -> Weight {
 		(0 as Weight)
-			// Standard Error: 14_000
-			.saturating_add((12_407_000 as Weight).saturating_mul(i as Weight))
+			// Standard Error: 24_000
+			.saturating_add((15_540_000 as Weight).saturating_mul(i as Weight))
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().reads((1 as Weight).saturating_mul(i as Weight)))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
@@ -354,26 +376,26 @@ impl WeightInfo for () {
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Class (r:1 w:0)
 	fn freeze() -> Weight {
-		(21_452_000 as Weight)
+		(25_194_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Asset (r:1 w:1)
 	// Storage: Uniques Class (r:1 w:0)
 	fn thaw() -> Weight {
-		(22_155_000 as Weight)
+		(25_397_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	fn freeze_collection() -> Weight {
-		(16_897_000 as Weight)
+		(19_278_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	fn thaw_collection() -> Weight {
-		(16_657_000 as Weight)
+		(19_304_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
@@ -381,20 +403,20 @@ impl WeightInfo for () {
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:2)
 	fn transfer_ownership() -> Weight {
-		(25_057_000 as Weight)
+		(28_615_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(4 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	fn set_team() -> Weight {
-		(17_253_000 as Weight)
+		(19_943_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassAccount (r:0 w:1)
 	fn force_item_status() -> Weight {
-		(20_010_000 as Weight)
+		(22_583_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
@@ -402,7 +424,7 @@ impl WeightInfo for () {
 	// Storage: Uniques InstanceMetadataOf (r:1 w:0)
 	// Storage: Uniques Attribute (r:1 w:1)
 	fn set_attribute() -> Weight {
-		(41_159_000 as Weight)
+		(47_520_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(3 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
@@ -410,63 +432,79 @@ impl WeightInfo for () {
 	// Storage: Uniques InstanceMetadataOf (r:1 w:0)
 	// Storage: Uniques Attribute (r:1 w:1)
 	fn clear_attribute() -> Weight {
-		(39_598_000 as Weight)
+		(45_316_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(3 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques InstanceMetadataOf (r:1 w:1)
 	fn set_metadata() -> Weight {
-		(33_387_000 as Weight)
+		(38_391_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques InstanceMetadataOf (r:1 w:1)
 	fn clear_metadata() -> Weight {
-		(33_208_000 as Weight)
+		(38_023_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:1)
 	// Storage: Uniques ClassMetadataOf (r:1 w:1)
 	fn set_collection_metadata() -> Weight {
-		(32_619_000 as Weight)
+		(37_398_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(2 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques ClassMetadataOf (r:1 w:1)
 	fn clear_collection_metadata() -> Weight {
-		(31_028_000 as Weight)
+		(35_621_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques Asset (r:1 w:1)
 	fn approve_transfer() -> Weight {
-		(22_263_000 as Weight)
+		(25_856_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques Class (r:1 w:0)
 	// Storage: Uniques Asset (r:1 w:1)
 	fn cancel_approval() -> Weight {
-		(22_910_000 as Weight)
+		(26_098_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques OwnershipAcceptance (r:1 w:1)
 	fn set_accept_ownership() -> Weight {
-		(20_716_000 as Weight)
+		(24_076_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
 	// Storage: Uniques CollectionMaxSupply (r:1 w:1)
 	// Storage: Uniques Class (r:1 w:0)
 	fn set_collection_max_supply() -> Weight {
-		(19_380_000 as Weight)
+		(22_035_000 as Weight)
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
 	}
+	// Storage: Uniques Asset (r:1 w:0)
+	// Storage: Uniques ItemPriceOf (r:0 w:1)
+	fn set_price() -> Weight {
+		(22_534_000 as Weight)
+			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
+			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
+	}
+	// Storage: Uniques Asset (r:1 w:1)
+	// Storage: Uniques ItemPriceOf (r:1 w:1)
+	// Storage: Uniques Class (r:1 w:0)
+	// Storage: Uniques Account (r:0 w:2)
+	fn buy_item() -> Weight {
+		(45_272_000 as Weight)
+			.saturating_add(RocksDbWeight::get().reads(3 as Weight))
+			.saturating_add(RocksDbWeight::get().writes(4 as Weight))
+	}
 }