diff --git a/package-lock.json b/package-lock.json
index d4f38a2a..9a8d6de8 100644
--- a/package-lock.json
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     },
     "@rsksmart/rif-relay-contracts": {
-      "version": "git+ssh://git@github.com/rsksmart/rif-relay-contracts.git#c1ad3c93b53cc01690536075fcef95718ddc4a55",
+      "version": "git+ssh://git@github.com/rsksmart/rif-relay-contracts.git#de10bafbb9a9811df6641c3c247a19870ed209ed",
       "from": "@rsksmart/rif-relay-contracts@github:rsksmart/rif-relay-contracts#RREL-020/insufficient-verification",
       "requires": {
         "@metamask/eth-sig-util": "^4.0.1",
@@ -14095,9 +14049,9 @@
       "integrity": "sha512-+68kP9yzs4LMp7VNh8gdzMSPZFL44MLGqiHWvttYJe+6qnuVr4Ek9wSBQoveqY/r+LwjCcU29kNVkidwim+kYA=="
     },
     "@types/qs": {
-      "version": "6.9.14",
-      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.14.tgz",
-      "integrity": "sha512-5khscbd3SwWMhFqylJBLQ0zIu7c1K6Vz0uBIt915BI3zV0q1nfjRQD3RqSBcPaO6PHEF4ov/t9y89fSiyThlPA=="
+      "version": "6.9.15",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.15.tgz",
+      "integrity": "sha512-uXHQKES6DQKKCLh441Xv/dwxOq1TVS3JPUMlEqoEglvlhR6Mxnlew/Xq/LRVHpLyk7iK3zODe1qYHIMltO7XGg=="
     },
     "@types/range-parser": {
       "version": "1.2.7",
@@ -15697,9 +15651,9 @@
       "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow=="
     },
     "electron-to-chromium": {
-      "version": "1.4.736",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.736.tgz",
-      "integrity": "sha512-Rer6wc3ynLelKNM4lOCg7/zPQj8tPOCB2hzD32PX9wd3hgRRi9MxEbmkFCokzcEhRVMiOVLjnL9ig9cefJ+6+Q=="
+      "version": "1.4.737",
+      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.737.tgz",
+      "integrity": "sha512-QvLTxaLHKdy5YxvixAw/FfHq2eWLUL9KvsPjp0aHK1gI5d3EDuDgITkvj0nFO2c6zUY3ZqVAJQiBYyQP9tQpfw=="
     },
     "elliptic": {
       "version": "6.5.4",
diff --git a/test/RelayHub.test.ts b/test/RelayHub.test.ts
index bc8cbc7f..91aebd97 100644
--- a/test/RelayHub.test.ts
+++ b/test/RelayHub.test.ts
@@ -1,6 +1,6 @@
 import { expect } from 'chai';
 import { ethers } from 'hardhat';
-import { BigNumber, Wallet, constants, providers, utils } from 'ethers';
+import { BigNumber, Wallet, constants, providers } from 'ethers';
 import {
   UtilToken,
   SmartWalletFactory,
@@ -39,6 +39,7 @@ import {
   evmMineMany,
   deployRelayHub,
   deployContract,
+  addSwapHash,
 } from './utils/TestUtils';
 import { RelayWorkersAddedEvent } from 'typechain-types/@rsksmart/rif-relay-contracts/contracts/RelayHub';
 
@@ -1006,32 +1007,13 @@ describe('RelayHub', function () {
             constants.AddressZero,
             nextWalletIndex
           );
-
           claimedValue = ethers.utils.parseEther('0.5');
-          const refundAddress = Wallet.createRandom().address;
-          const timelock = 500;
-          const preimageHash = utils.soliditySha256(
-            ['bytes32'],
-            [constants.HashZero]
-          );
-          data = swap.interface.encodeFunctionData(
-            'claim(bytes32,uint256,address,address,uint256)',
-            [
-              constants.HashZero,
-              claimedValue,
-              smartWalletAddress,
-              refundAddress,
-              timelock,
-            ]
-          );
-          const hash = await swap.hashValues(
-            preimageHash,
-            claimedValue,
-            smartWalletAddress,
-            refundAddress,
-            timelock
-          );
-          await swap.addSwap(hash);
+          data = await addSwapHash({
+            swap,
+            amount: claimedValue,
+            claimAddress: smartWalletAddress,
+            refundAddress: Wallet.createRandom().address,
+          });
         });
 
         it('should fail if revert from destination contract', async function () {
@@ -1223,9 +1205,6 @@ describe('RelayHub', function () {
         let minimalBoltzFactory: MinimalBoltzSmartWalletFactory;
         let claimedValue: BigNumber;
         let smartWalletAddress: string;
-        const timelock = 500;
-        let refundAddress: string;
-        let preimageHash: string;
 
         beforeEach(async function () {
           const smartWalletTemplate =
@@ -1248,42 +1227,24 @@ describe('RelayHub', function () {
             constants.AddressZero,
             nextWalletIndex
           );
-
-          refundAddress = Wallet.createRandom().address;
           claimedValue = ethers.utils.parseEther('0.5');
-          preimageHash = utils.soliditySha256(
-            ['bytes32'],
-            [constants.HashZero]
-          );
-          data = swap.interface.encodeFunctionData(
-            'claim(bytes32,uint256,address,address,uint256)',
-            [
-              constants.HashZero,
-              claimedValue,
-              smartWalletAddress,
-              refundAddress,
-              timelock,
-            ]
-          );
-          const hash = await swap.hashValues(
-            preimageHash,
-            claimedValue,
-            smartWalletAddress,
-            refundAddress,
-            timelock
-          );
-          await swap.addSwap(hash);
+          data = await addSwapHash({
+            swap,
+            amount: claimedValue,
+            claimAddress: smartWalletAddress,
+            refundAddress: Wallet.createRandom().address,
+          });
         });
 
         it('should fail if revert from destination contract', async function () {
           data = swap.interface.encodeFunctionData(
             'claim(bytes32,uint256,address,address,uint256)',
             [
-              preimageHash,
+              constants.HashZero,
               ethers.utils.parseEther('2'),
               smartWalletAddress,
-              refundAddress,
-              timelock,
+              constants.AddressZero,
+              500,
             ]
           );
 
diff --git a/test/relayclient/RelayClient.test.ts b/test/relayclient/RelayClient.test.ts
index 0fd67b5b..d1b99c30 100644
--- a/test/relayclient/RelayClient.test.ts
+++ b/test/relayclient/RelayClient.test.ts
@@ -1,5 +1,6 @@
 import { expect } from 'chai';
 import {
+  addSwapHash,
   assertLog,
   createSmartWalletFactory,
   createSupportedSmartWallet,
@@ -29,7 +30,7 @@ import {
   HttpClient,
   HttpWrapper,
 } from '@rsksmart/rif-relay-client';
-import { constants, utils, Wallet } from 'ethers';
+import { constants, Wallet } from 'ethers';
 import { ethers } from 'hardhat';
 import { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers';
 import { loadConfiguration } from '../relayserver/ServerTestUtils';
@@ -560,31 +561,13 @@ describe('RelayClient', function () {
             constants.AddressZero,
             nextWalletIndex
           );
-          const refundAddress = Wallet.createRandom().address;
           const claimedValue = ethers.utils.parseEther('0.5');
-          const preimageHash = utils.soliditySha256(
-            ['bytes32'],
-            [constants.HashZero]
-          );
-          const timelock = 500;
-          data = swap.interface.encodeFunctionData(
-            'claim(bytes32,uint256,address,address,uint256)',
-            [
-              constants.HashZero,
-              claimedValue,
-              smartWalletAddress,
-              refundAddress,
-              timelock,
-            ]
-          );
-          const hash = await swap.hashValues(
-            preimageHash,
-            claimedValue,
-            smartWalletAddress,
-            refundAddress,
-            timelock
-          );
-          await swap.addSwap(hash);
+          data = await addSwapHash({
+            swap,
+            amount: claimedValue,
+            claimAddress: smartWalletAddress,
+            refundAddress: Wallet.createRandom().address,
+          });
         });
 
         it('without tokenGas', async function () {
diff --git a/test/relayserver/RelayServer.test.ts b/test/relayserver/RelayServer.test.ts
index 9b977881..e4ef3dee 100644
--- a/test/relayserver/RelayServer.test.ts
+++ b/test/relayserver/RelayServer.test.ts
@@ -33,6 +33,7 @@ import {
   createRelayUserDefinedRequest,
   createDeployUserDefinedRequest,
   getSmartWalletTemplate,
+  addSwapHash,
 } from '../utils/TestUtils';
 import config from 'config';
 import {
@@ -56,7 +57,7 @@ import {
   RelayRequestBody,
   setEnvelopingConfig,
 } from '@rsksmart/rif-relay-client';
-import { BigNumber, constants, utils, Wallet } from 'ethers';
+import { BigNumber, constants, Wallet } from 'ethers';
 import { spy, match } from 'sinon';
 import {
   TestDeployVerifierConfigurableMisbehavior,
@@ -728,39 +729,20 @@ describe('RelayServer', function () {
         let index = 1;
 
         beforeEach(async function () {
+          index++;
           swap = await deployContract<TestSwap>('TestSwap');
           const smartWalletAddress = await boltzFactory.getSmartWalletAddress(
             owner.address,
             constants.AddressZero,
             index
           );
-          const claimedValue = ethers.utils.parseEther('0.5');
-          const refundAddress = Wallet.createRandom().address;
-          const timelock = 500;
-          const preimageHash = utils.soliditySha256(
-            ['bytes32'],
-            [constants.HashZero]
-          );
-          encodedData = swap.interface.encodeFunctionData(
-            'claim(bytes32,uint256,address,address,uint256)',
-            [
-              constants.HashZero,
-              claimedValue,
-              smartWalletAddress,
-              refundAddress,
-              timelock,
-            ]
-          );
-          const hash = await swap.hashValues(
-            preimageHash,
-            claimedValue,
-            smartWalletAddress,
-            refundAddress,
-            timelock
-          );
-          await swap.addSwap(hash);
+          encodedData = await addSwapHash({
+            swap,
+            amount: ethers.utils.parseEther('0.5'),
+            claimAddress: smartWalletAddress,
+            refundAddress: Wallet.createRandom().address,
+          });
           await boltzVerifier.acceptContract(swap.address);
-          index++;
         });
 
         it('should relay deploy transaction with contract execution', async function () {
@@ -823,7 +805,7 @@ describe('RelayServer', function () {
             relayServer.createRelayTransaction(
               stringifyEnvelopingTx(envelopingTxRequest)
             )
-          ).to.be.rejectedWith('Claiming value lower than fees');
+          ).to.be.rejectedWith('Native balance too lo');
         });
 
         // FIXME - Should bubble up error but its failing with a different error
@@ -868,30 +850,12 @@ describe('RelayServer', function () {
               index
             );
           const claimedValue = ethers.utils.parseEther('0.5');
-          const refundAddress = Wallet.createRandom().address;
-          const timelock = 500;
-          const preimageHash = utils.soliditySha256(
-            ['bytes32'],
-            [constants.HashZero]
-          );
-          encodedData = swap.interface.encodeFunctionData(
-            'claim(bytes32,uint256,address,address,uint256)',
-            [
-              constants.HashZero,
-              claimedValue,
-              smartWalletAddress,
-              refundAddress,
-              timelock,
-            ]
-          );
-          const hash = await swap.hashValues(
-            preimageHash,
-            claimedValue,
-            smartWalletAddress,
-            refundAddress,
-            timelock
-          );
-          await swap.addSwap(hash);
+          encodedData = await addSwapHash({
+            swap,
+            amount: claimedValue,
+            claimAddress: smartWalletAddress,
+            refundAddress: Wallet.createRandom().address,
+          });
           await minimalBoltzVerifier.acceptContract(swap.address);
           index++;
         });
@@ -956,7 +920,7 @@ describe('RelayServer', function () {
             relayServer.createRelayTransaction(
               stringifyEnvelopingTx(envelopingTxRequest)
             )
-          ).to.be.rejectedWith('Claiming value lower than fees');
+          ).to.be.rejectedWith('Native balance too low');
         });
       });
     });
diff --git a/test/relayserver/RelayServerNoClient.test.ts b/test/relayserver/RelayServerNoClient.test.ts
index c1aaaab9..a87d57b0 100644
--- a/test/relayserver/RelayServerNoClient.test.ts
+++ b/test/relayserver/RelayServerNoClient.test.ts
@@ -15,7 +15,7 @@ import {
 import axios, { AxiosResponse } from 'axios';
 import { expect } from 'chai';
 import config from 'config';
-import { Wallet, constants, utils } from 'ethers';
+import { Wallet, constants } from 'ethers';
 import { ethers } from 'hardhat';
 import {
   EnvelopingRequestOptional,
@@ -31,6 +31,7 @@ import {
 } from 'typechain-types';
 import {
   RSK_URL,
+  addSwapHash,
   assertLog,
   createSmartWalletFactory,
   deployContract,
@@ -194,30 +195,12 @@ describe('RelayServerNoClient', function () {
           0
         );
         const claimedValue = ethers.utils.parseEther('0.5');
-        const refundAddress = Wallet.createRandom().address;
-        const timelock = 500;
-        const preimageHash = utils.soliditySha256(
-          ['bytes32'],
-          [constants.HashZero]
-        );
-        data = swap.interface.encodeFunctionData(
-          'claim(bytes32,uint256,address,address,uint256)',
-          [
-            constants.HashZero,
-            claimedValue,
-            smartWalletAddress,
-            refundAddress,
-            timelock,
-          ]
-        );
-        const hash = await swap.hashValues(
-          preimageHash,
-          claimedValue,
-          smartWalletAddress,
-          refundAddress,
-          timelock
-        );
-        await swap.addSwap(hash);
+        data = await addSwapHash({
+          swap,
+          amount: claimedValue,
+          claimAddress: smartWalletAddress,
+          refundAddress: Wallet.createRandom().address,
+        });
 
         baseRequestFields = {
           request: {
@@ -292,30 +275,12 @@ describe('RelayServerNoClient', function () {
           0
         );
         const claimedValue = ethers.utils.parseEther('0.5');
-        const refundAddress = Wallet.createRandom().address;
-        const timelock = 500;
-        const preimageHash = utils.soliditySha256(
-          ['bytes32'],
-          [constants.HashZero]
-        );
-        data = swap.interface.encodeFunctionData(
-          'claim(bytes32,uint256,address,address,uint256)',
-          [
-            constants.HashZero,
-            claimedValue,
-            smartWalletAddress,
-            refundAddress,
-            timelock,
-          ]
-        );
-        const hash = await swap.hashValues(
-          preimageHash,
-          claimedValue,
-          smartWalletAddress,
-          refundAddress,
-          timelock
-        );
-        await swap.addSwap(hash);
+        data = await addSwapHash({
+          swap,
+          amount: claimedValue,
+          claimAddress: smartWalletAddress,
+          refundAddress: Wallet.createRandom().address,
+        });
 
         baseRequestFields = {
           request: {
diff --git a/test/utils/TestUtils.ts b/test/utils/TestUtils.ts
index 90aa4b9a..cdc840e9 100644
--- a/test/utils/TestUtils.ts
+++ b/test/utils/TestUtils.ts
@@ -62,6 +62,7 @@ import SmartWalletJson from '../../artifacts/@rsksmart/rif-relay-contracts/contr
 import CustomSmartWalletJson from '../../artifacts/@rsksmart/rif-relay-contracts/contracts/smartwallet/CustomSmartWallet.sol/CustomSmartWallet.json';
 import BoltzSmartWalletJson from '../../artifacts/@rsksmart/rif-relay-contracts/contracts/smartwallet/BoltzSmartWallet.sol/BoltzSmartWallet.json';
 import MinimalBoltzSmartWalletJson from '../../artifacts/@rsksmart/rif-relay-contracts/contracts/smartwallet/MinimalBoltzSmartWallet.sol/MinimalBoltzSmartWallet.json';
+import { TestSwap } from '../../typechain-types';
 
 use(chaiAsPromised);
 
@@ -306,7 +307,7 @@ const createSupportedSmartWallet = async <
   return new Contract(swAddress, abis[type], owner) as T;
 };
 
-export const signEnvelopingRequest = async (
+const signEnvelopingRequest = async (
   envelopingRequest: EnvelopingRequest,
   signer: Wallet
 ) => {
@@ -579,6 +580,48 @@ const assertLog = async ({
   expect(log?.args?.at(index), 'Log value expected').to.be.equal(value);
 };
 
+type AddSwapParams = {
+  swap: TestSwap;
+  amount: BigNumberish;
+  claimAddress: string;
+  refundAddress: string;
+  preimage?: string;
+  timelock?: BigNumberish;
+  external?: boolean;
+};
+
+const addSwapHash = async ({
+  swap,
+  amount,
+  claimAddress,
+  refundAddress,
+  preimage = constants.HashZero,
+  timelock = 500,
+  external = false,
+}: AddSwapParams): Promise<string> => {
+  const preimageHash = utils.soliditySha256(['bytes32'], [preimage]);
+  const hash = await swap.hashValues(
+    preimageHash,
+    amount,
+    claimAddress,
+    refundAddress,
+    timelock
+  );
+  await swap.addSwap(hash);
+
+  if (external) {
+    return swap.interface.encodeFunctionData(
+      'claim(bytes32,uint256,address,uint256)',
+      [preimage, amount, refundAddress, timelock]
+    );
+  }
+
+  return swap.interface.encodeFunctionData(
+    'claim(bytes32,uint256,address,address,uint256)',
+    [preimage, amount, claimAddress, refundAddress, timelock]
+  );
+};
+
 export {
   evmMine,
   evmMineMany,
@@ -598,11 +641,13 @@ export {
   generateRandomAddress,
   getSuffixDataAndSignature,
   createSupportedSmartWallet,
+  signEnvelopingRequest,
   RSK_URL,
   deployContract,
   getSmartWalletAddress,
   getSmartWalletTemplate,
   assertLog,
+  addSwapHash,
 };
 
 export type {
diff --git a/test/verifier/verifiers.test.ts b/test/verifier/verifiers.test.ts
index 05b87f1f..34e93e86 100644
--- a/test/verifier/verifiers.test.ts
+++ b/test/verifier/verifiers.test.ts
@@ -12,9 +12,10 @@ import chai, { expect } from 'chai';
 import chaiAsPromised from 'chai-as-promised';
 import { ethers as hardhat } from 'hardhat';
 import { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers';
-import { Wallet, providers, constants, utils } from 'ethers';
+import { Wallet, providers, constants } from 'ethers';
 import { prepareToken } from '../smartwallet/utils';
 import {
+  addSwapHash,
   createDeployEnvelopingRequest,
   createRelayEnvelopingRequest,
   createSupportedSmartWallet,
@@ -451,6 +452,7 @@ describe('Verifiers tests', function () {
         testToken = (await prepareToken('TestToken')) as TestToken;
         await testToken.mint(TOKEN_AMOUNT_TO_TRANSFER + 10, expectedAddress);
         await deployVerifier.acceptToken(testToken.address);
+        await deployVerifier.acceptContract(constants.AddressZero);
       });
 
       it('Should succeed when the deploy is correct', async function () {
@@ -525,7 +527,7 @@ describe('Verifiers tests', function () {
       let swap: TestSwap;
       let data: string;
       let refundAddress: string;
-      let timelock: number;
+      const timelock = 500;
 
       beforeEach(async function () {
         swap = await deployContract<TestSwap>('TestSwap');
@@ -536,30 +538,15 @@ describe('Verifiers tests', function () {
             SMART_WALLET_INDEX
           );
         refundAddress = Wallet.createRandom().address;
-        timelock = 500;
-        const preimageHash = utils.soliditySha256(
-          ['bytes32'],
-          [constants.HashZero]
-        );
-        data = swap.interface.encodeFunctionData(
-          'claim(bytes32,uint256,address,address,uint256)',
-          [
-            constants.HashZero,
-            TOKEN_AMOUNT_TO_TRANSFER,
-            smartWalletAddress,
-            refundAddress,
-            timelock,
-          ]
-        );
-        const hash = await swap.hashValues(
-          preimageHash,
-          TOKEN_AMOUNT_TO_TRANSFER,
-          smartWalletAddress,
+        data = await addSwapHash({
+          swap,
+          amount: TOKEN_AMOUNT_TO_TRANSFER,
+          claimAddress: smartWalletAddress,
           refundAddress,
-          timelock
-        );
-        await swap.addSwap(hash);
+          timelock,
+        });
         await deployVerifier.acceptContract(swap.address);
+        await deployVerifier.acceptContract(constants.AddressZero);
       });
 
       it('Should succeed destination contract provide enough balance (public method)', async function () {
@@ -708,7 +695,7 @@ describe('Verifiers tests', function () {
 
         await expect(
           deployVerifier.verifyRelayedCall(deployRequest, signature)
-        ).to.be.rejectedWith('Claiming value lower than fees');
+        ).to.be.rejectedWith('Native balance too low');
       });
     });
   });
@@ -721,7 +708,7 @@ describe('Verifiers tests', function () {
     let deployVerifier: MinimalBoltzDeployVerifier;
     let smartWalletFactory: MinimalBoltzSmartWalletFactory;
     let refundAddress: string;
-    let timelock: number;
+    const timelock = 500;
 
     beforeEach(async function () {
       swap = await deployContract('TestSwap');
@@ -755,29 +742,13 @@ describe('Verifiers tests', function () {
         SMART_WALLET_INDEX
       );
       refundAddress = Wallet.createRandom().address;
-      timelock = 500;
-      const preimageHash = utils.soliditySha256(
-        ['bytes32'],
-        [constants.HashZero]
-      );
-      data = swap.interface.encodeFunctionData(
-        'claim(bytes32,uint256,address,address,uint256)',
-        [
-          constants.HashZero,
-          TOKEN_AMOUNT_TO_TRANSFER,
-          smartWalletAddress,
-          refundAddress,
-          timelock,
-        ]
-      );
-      const hash = await swap.hashValues(
-        preimageHash,
-        TOKEN_AMOUNT_TO_TRANSFER,
-        smartWalletAddress,
+      data = await addSwapHash({
+        swap,
+        amount: TOKEN_AMOUNT_TO_TRANSFER,
+        claimAddress: smartWalletAddress,
         refundAddress,
-        timelock
-      );
-      await swap.addSwap(hash);
+        timelock,
+      });
 
       await deployVerifier.acceptContract(swap.address);
     });
@@ -878,7 +849,7 @@ describe('Verifiers tests', function () {
 
       await expect(
         deployVerifier.verifyRelayedCall(deployRequest, signature)
-      ).to.be.rejectedWith('Claiming value lower than fees');
+      ).to.be.rejectedWith('Native balance too low');
     });
 
     it('Should fail if the destination contract is not allowed', async function () {