--- a/tests/src/eth/marketplace/marketplace.test.ts
+++ b/tests/src/eth/marketplace/marketplace.test.ts
@@ -2,7 +2,7 @@
 import {getBalanceSingle, transferBalanceExpectSuccess} from '../../substrate/get-balance';
 import privateKey from '../../substrate/privateKey';
 import {addToAllowListExpectSuccess, confirmSponsorshipExpectSuccess, createCollectionExpectSuccess, createFungibleItemExpectSuccess, createItemExpectSuccess, getTokenOwner, setCollectionSponsorExpectSuccess, transferExpectSuccess, transferFromExpectSuccess} from '../../util/helpers';
-import {collectionIdToAddress, contractHelpers, createEthAccountWithBalance, executeEthTxOnSub, GAS_ARGS, itWeb3, subToEth, subToEthLowercase} from '../util/helpers';
+import {collectionIdToAddress, contractHelpers, createEthAccountWithBalance, executeEthTxOnSub, GAS_ARGS, itWeb3, subToEth, subToEthLowercase, transferBalanceToEth} from '../util/helpers';
 import {evmToAddress} from '@polkadot/util-crypto';
 import nonFungibleAbi from '../nonFungibleAbi.json';
 import fungibleAbi from '../fungibleAbi.json';
@@ -12,35 +12,33 @@
 
 describe('Matcher contract usage', () => {
   itWeb3('With UNQ', async ({api, web3}) => {
+    const alice = privateKey('//Alice');
+    const collectionId = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
+    const evmCollection = new web3.eth.Contract(nonFungibleAbi as any, collectionIdToAddress(collectionId));
     const matcherOwner = await createEthAccountWithBalance(api, web3);
+    const helpers = contractHelpers(web3, matcherOwner);
+
     const matcherContract = new web3.eth.Contract(JSON.parse((await readFile(`${__dirname}/MarketPlace.abi`)).toString()), undefined, {
       from: matcherOwner,
       ...GAS_ARGS,
     });
     const matcher = await matcherContract.deploy({data: (await readFile(`${__dirname}/MarketPlace.bin`)).toString(), arguments:[matcherOwner]}).send({from: matcherOwner});
-    const helpers = contractHelpers(web3, matcherOwner);
+
+    await transferBalanceToEth(api, alice, matcher.options.address);
     await helpers.methods.toggleSponsoring(matcher.options.address, true).send({from: matcherOwner});
-    await helpers.methods.setSponsoringRateLimit(matcher.options.address, 1).send({from: matcherOwner});
 
-    const alice = privateKey('//Alice');
-    const collectionId = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-    const evmCollection = new web3.eth.Contract(nonFungibleAbi as any, collectionIdToAddress(collectionId), {from: matcherOwner});
+    await transferBalanceToEth(api, alice, subToEth(alice.address));
     await setCollectionSponsorExpectSuccess(collectionId, alice.address);
     await confirmSponsorshipExpectSuccess(collectionId);
 
-    await helpers.methods.toggleAllowed(matcher.options.address, subToEth(alice.address), true).send({from: matcherOwner});
-    await addToAllowListExpectSuccess(alice, collectionId, evmToAddress(subToEth(alice.address)));
-
-    const seller = privateKey('//Bob');
+    const seller = privateKey('//Seller/' + Date.now());
+    await addToAllowListExpectSuccess(alice, collectionId, {Ethereum:subToEth(seller.address)});
     await helpers.methods.toggleAllowed(matcher.options.address, subToEth(seller.address), true).send({from: matcherOwner});
-    await addToAllowListExpectSuccess(alice, collectionId, evmToAddress(subToEth(seller.address)));
 
     const tokenId = await createItemExpectSuccess(alice, collectionId, 'NFT', seller.address);
 
-    // To transfer item to matcher it first needs to be transfered to EVM account of bob
+    // To transfer item to matcher it first needs to be transfered to EVM account of seller
     await transferExpectSuccess(collectionId, tokenId, seller, {Ethereum: subToEth(seller.address)});
-
-    // Token is owned by seller initially
     expect(await getTokenOwner(api, collectionId, tokenId)).to.be.deep.equal({Ethereum: subToEthLowercase(seller.address)});
 
     // Ask
@@ -55,14 +53,12 @@
     // Buy
     {
       const sellerBalanceBeforePurchase = await getBalanceSingle(api, seller.address);
-      // There is two functions named 'buy', so we should provide full signature
-      await executeEthTxOnSub(api, alice, matcher, m => m['buy(address,uint256)'](evmCollection.options.address, tokenId), {value: PRICE});
+      await executeEthTxOnSub(api, alice, matcher, m => m.buy(evmCollection.options.address, tokenId), {value: PRICE});
       expect(await getBalanceSingle(api, seller.address) - sellerBalanceBeforePurchase === PRICE);
     }
 
     // Token is transferred to evm account of alice
     expect(await getTokenOwner(api, collectionId, tokenId)).to.be.deep.equal({Ethereum: subToEthLowercase(alice.address)});
-
 
     // Transfer token to substrate side of alice
     await transferFromExpectSuccess(collectionId, tokenId, alice, {Ethereum: subToEth(alice.address)}, {Substrate: alice.address});
@@ -137,37 +133,35 @@
   });
 
   itWeb3('With escrow', async ({api, web3}) => {
+    const alice = privateKey('//Alice');
+    const collectionId = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
+    const evmCollection = new web3.eth.Contract(nonFungibleAbi as any, collectionIdToAddress(collectionId));
     const matcherOwner = await createEthAccountWithBalance(api, web3);
+    const helpers = contractHelpers(web3, matcherOwner);
     const escrow = await createEthAccountWithBalance(api, web3);
+
     const matcherContract = new web3.eth.Contract(JSON.parse((await readFile(`${__dirname}/MarketPlace.abi`)).toString()), undefined, {
       from: matcherOwner,
       ...GAS_ARGS,
     });
     const matcher = await matcherContract.deploy({data: (await readFile(`${__dirname}/MarketPlace.bin`)).toString(), arguments: [matcherOwner]}).send({from: matcherOwner});
     await matcher.methods.setEscrow(escrow).send({from: matcherOwner});
-    const helpers = contractHelpers(web3, matcherOwner);
+
+    await transferBalanceToEth(api, alice, matcher.options.address);
     await helpers.methods.toggleSponsoring(matcher.options.address, true).send({from: matcherOwner});
-    await helpers.methods.setSponsoringRateLimit(matcher.options.address, 1).send({from: matcherOwner});
 
-    const alice = privateKey('//Alice');
-    const collectionId = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-    const evmCollection = new web3.eth.Contract(nonFungibleAbi as any, collectionIdToAddress(collectionId), {from: matcherOwner});
+    await transferBalanceToEth(api, alice, subToEth(alice.address));
     await setCollectionSponsorExpectSuccess(collectionId, alice.address);
     await confirmSponsorshipExpectSuccess(collectionId);
-
-    await helpers.methods.toggleAllowed(matcher.options.address, subToEth(alice.address), true).send({from: matcherOwner});
-    await addToAllowListExpectSuccess(alice, collectionId, evmToAddress(subToEth(alice.address)));
 
-    const seller = privateKey('//Bob');
+    const seller = privateKey('//Seller/' + Date.now());
     await helpers.methods.toggleAllowed(matcher.options.address, subToEth(seller.address), true).send({from: matcherOwner});
     await addToAllowListExpectSuccess(alice, collectionId, evmToAddress(subToEth(seller.address)));
 
     const tokenId = await createItemExpectSuccess(alice, collectionId, 'NFT', seller.address);
 
-    // To transfer item to matcher it first needs to be transfered to EVM account of bob
+    // To transfer item to matcher it first needs to be transfered to EVM account of seller
     await transferExpectSuccess(collectionId, tokenId, seller, {Ethereum: subToEth(seller.address)});
-
-    // Token is owned by seller initially
     expect(await getTokenOwner(api, collectionId, tokenId)).to.be.deep.equal({Ethereum: subToEthLowercase(seller.address)});
 
     // Ask
--- a/tests/src/eth/util/helpers.ts
+++ b/tests/src/eth/util/helpers.ts
@@ -228,6 +228,18 @@
   return new web3.eth.Contract(contractHelpersAbi as any, '0x842899ECF380553E8a4de75bF534cdf6fBF64049', {from: caller, ...GAS_ARGS});
 }
 
+/**
+ * Execute ethereum method call using substrate account
+ * @param to target contract
+ * @param mkTx - closure, receiving `contract.methods`, and returning method call,
+ * to be used as following (assuming `to` = erc20 contract):
+ * `m => m.transfer(to, amount)`
+ * 
+ * # Example
+ * ```ts
+ * executeEthTxOnSub(api, alice, erc20Contract, m => m.transfer(target, amount));
+ * ```
+ */
 export async function executeEthTxOnSub(api: ApiPromise, from: IKeyringPair, to: any, mkTx: (methods: any) => any, {value = 0}: {value?: bigint | number} = { }) {
   const tx = api.tx.evm.call(
     subToEth(from.address),
@@ -246,6 +258,11 @@
   return (await getBalance(api, [evmToAddress(address)]))[0];
 }
 
+/**
+ * Measure how much gas given closure consumes
+ * 
+ * @param user which user balance will be checked
+ */
 export async function recordEthFee(api: ApiPromise, user: string, call: () => Promise<any>): Promise<bigint> {
   const before = await ethBalanceViaSub(api, user);