diff --git a/src/Conversions.ts b/src/Conversions.ts
index ba1cb96..2afad12 100644
--- a/src/Conversions.ts
+++ b/src/Conversions.ts
@@ -79,7 +79,7 @@ export const toNativeWeiFrom = ({
   const bigxRate = BigNumberJs(xRate ?? '0');
 
   if (bigAmount.isZero() || bigxRate.isZero()) {
-    return BigNumberJs(constants.Zero.toString());
+    return BigNumberJs(0);
   }
 
   const amountAsFraction = toPrecision({
diff --git a/src/RegistrationManager.ts b/src/RegistrationManager.ts
index 67d492d..1215d9b 100644
--- a/src/RegistrationManager.ts
+++ b/src/RegistrationManager.ts
@@ -30,6 +30,7 @@ import {
 import type { ManagerEvent, PastEventOptions } from './definitions/event.type';
 import { getServerConfig } from './ServerConfigParams';
 import { getPastEventsForHub } from './getPastEventsForHub';
+import type { RelayManagerData } from '@rsksmart/rif-relay-client';
 
 export type RelayServerRegistryInfo = {
   url: string;
@@ -68,7 +69,7 @@ export class RegistrationManager {
 
   private readonly _txStoreManager: TxStoreManager;
 
-  private _relayData: IRelayHub.RelayManagerDataStruct | undefined;
+  private _relayData: RelayManagerData | undefined;
 
   private _lastWorkerAddedTransaction: TypedEvent | undefined;
 
@@ -186,7 +187,14 @@ export class RegistrationManager {
       }
     }
 
-    this._relayData = await this.getRelayData();
+    const relayData = await this.getRelayData();
+
+    this._relayData = {
+      currentlyStaked: await relayData.currentlyStaked,
+      manager: await relayData.manager,
+      registered: await relayData.registered,
+      url: await relayData.url,
+    };
 
     for (const eventData of hubEventsSinceLastScan) {
       switch (eventData.event) {
@@ -423,7 +431,7 @@ export class RegistrationManager {
     const provider = getProvider();
 
     const gasPrice = await provider.getGasPrice();
-    const gasLimit = BigNumber.from(minTxGasCost ? minTxGasCost : 21000);
+    const gasLimit = BigNumber.from(minTxGasCost ?? 21000);
     const txCost = gasLimit.mul(gasPrice);
 
     const managerBalance = await provider.getBalance(this._managerAddress);
@@ -470,7 +478,7 @@ export class RegistrationManager {
 
     const provider = getProvider();
     const gasPrice = await provider.getGasPrice();
-    const gasLimit = BigNumber.from(minTxGasCost ? minTxGasCost : 21000);
+    const gasLimit = BigNumber.from(minTxGasCost ?? 21000);
     const txCost = gasPrice.mul(gasLimit);
 
     const workerBalance = await provider.getBalance(this._workerAddress);
diff --git a/src/RelayServer.ts b/src/RelayServer.ts
index 5866cd1..11d4e7f 100644
--- a/src/RelayServer.ts
+++ b/src/RelayServer.ts
@@ -266,29 +266,26 @@ export class RelayServer extends EventEmitter {
       contracts: { relayHubAddress },
     } = this.config;
 
+    const relayHubAddressValue = await metadata.relayHubAddress;
+
     // Check that the relayHub is the correct one
-    if (
-      metadata.relayHubAddress.toString().toLowerCase() !==
-      relayHubAddress.toLowerCase()
-    ) {
+    if (relayHubAddressValue.toLowerCase() !== relayHubAddress.toLowerCase()) {
       throw new Error(
-        `Wrong hub address.\nRelay server's hub address: ${
-          this.config.contracts.relayHubAddress
-        }, request's hub address: ${metadata.relayHubAddress.toString()}\n`
+        `Wrong hub address.\nRelay server's hub address: ${this.config.contracts.relayHubAddress}, request's hub address: ${relayHubAddressValue}\n`
       );
     }
 
-    const feesReceiver = relayRequest.relayData.feesReceiver.toString();
+    const feesReceiver = await relayRequest.relayData.feesReceiver;
     // Check the relayWorker (todo: once migrated to multiple relays, check if exists)
     if (feesReceiver.toLowerCase() !== this.feesReceiver.toLowerCase()) {
       throw new Error(`Wrong fees receiver address: ${feesReceiver}\n`);
     }
 
-    const gasPrice = relayRequest.relayData.gasPrice.toString();
+    const gasPrice = await relayRequest.relayData.gasPrice;
     // Check that the gasPrice is initialized & acceptable
     if (this.gasPrice.gt(gasPrice)) {
       throw new Error(
-        `Unacceptable gasPrice: relayServer's gasPrice:${this.gasPrice.toString()} request's gasPrice: ${gasPrice}`
+        `Unacceptable gasPrice: relayServer's gasPrice:${this.gasPrice.toString()} request's gasPrice: ${gasPrice.toString()}`
       );
     }
 
@@ -299,9 +296,11 @@ export class RelayServer extends EventEmitter {
     );
   }
 
-  validateVerifier(envelopingRequest: EnvelopingTxRequest): void {
-    const callVerifier =
-      envelopingRequest.relayRequest.relayData.callVerifier.toString();
+  async validateVerifier(
+    envelopingRequest: EnvelopingTxRequest
+  ): Promise<void> {
+    const callVerifier = await envelopingRequest.relayRequest.relayData
+      .callVerifier;
     if (!this.isTrustedVerifier(callVerifier)) {
       throw new Error(`Invalid verifier: ${callVerifier}`);
     }
@@ -320,8 +319,8 @@ export class RelayServer extends EventEmitter {
   async validateRequestWithVerifier(
     envelopingTransaction: EnvelopingTxRequest
   ): Promise<void> {
-    const verifier =
-      envelopingTransaction.relayRequest.relayData.callVerifier.toString();
+    const verifier = await envelopingTransaction.relayRequest.relayData
+      .callVerifier;
 
     if (!this.isTrustedVerifier(verifier)) {
       throw new Error('Invalid verifier');
@@ -410,9 +409,7 @@ export class RelayServer extends EventEmitter {
 
     return {
       maxPossibleGas: initialGasEstimation,
-      maxPossibleGasWithFee: initialGasEstimation.add(
-        fee.toFixed(0).toString()
-      ),
+      maxPossibleGasWithFee: initialGasEstimation.add(fee.toFixed(0)),
     };
   }
 
@@ -557,17 +554,20 @@ export class RelayServer extends EventEmitter {
 
     const provider = getProvider();
 
+    const relayHubAddress = await envelopingTransaction.metadata
+      .relayHubAddress;
+    const gasPrice = await envelopingTransaction.relayRequest.relayData
+      .gasPrice;
+
     const currentBlock = await provider.getBlockNumber();
     const details: SendTransactionDetails = {
       signer: this.workerAddress,
       serverAction: ServerAction.RELAY_CALL,
       method,
-      destination: envelopingTransaction.metadata.relayHubAddress.toString(),
+      destination: relayHubAddress,
       gasLimit: maxPossibleGasWithViewCall,
       creationBlockNumber: currentBlock,
-      gasPrice: BigNumber.from(
-        envelopingTransaction.relayRequest.relayData.gasPrice
-      ),
+      gasPrice: BigNumber.from(gasPrice.toString()),
     };
     const txDetails = await this.transactionManager.sendTransaction(details);
     // after sending a transaction is a good time to check the worker's balance, and replenish it.
diff --git a/src/TransactionManager.ts b/src/TransactionManager.ts
index 640852d..b2a6079 100644
--- a/src/TransactionManager.ts
+++ b/src/TransactionManager.ts
@@ -291,10 +291,10 @@ data         | 0x${transaction.data ?? ''}
     const bigRetryGasPriceFactor = BigNumberJs(
       this.config.blockchain.retryGasPriceFactor
     );
-    const oldPrice = BigNumber.from(oldGasPrice);
-    const bigOldGasPrice = BigNumberJs(oldPrice.toString());
 
-    const bigNewGasPrice = bigRetryGasPriceFactor.multipliedBy(bigOldGasPrice);
+    const bigNewGasPrice = bigRetryGasPriceFactor.multipliedBy(
+      oldGasPrice ? oldGasPrice.toString() : 0
+    );
 
     let newGasPrice = BigNumber.from(bigNewGasPrice.toFixed(0));
 
diff --git a/src/Utils.ts b/src/Utils.ts
index fa0298d..efbd28d 100644
--- a/src/Utils.ts
+++ b/src/Utils.ts
@@ -10,6 +10,7 @@ import { getDefaultProvider, providers, utils } from 'ethers';
 import { getAddress } from 'ethers/lib/utils';
 import ow from 'ow';
 import { getServerConfig } from './ServerConfigParams';
+import type { RelayManagerData } from '@rsksmart/rif-relay-client';
 
 const CONFIG_CONTRACTS = 'contracts';
 const CONFIG_BLOCKCHAIN = 'blockchain';
@@ -87,18 +88,17 @@ export function isSecondEventLater(a: TypedEvent, b: TypedEvent): boolean {
 }
 
 export function isRegistrationValid(
-  relayData: IRelayHub.RelayManagerDataStruct | undefined,
+  relayData: RelayManagerData | undefined,
   managerAddress: string
 ): boolean {
   if (relayData) {
-    const manager = relayData.manager.toString();
     const {
       app: { url: serverUrl },
     } = getServerConfig();
 
     return (
-      isSameAddress(manager, managerAddress) &&
-      relayData.url.toString() === serverUrl
+      isSameAddress(relayData.manager, managerAddress) &&
+      relayData.url === serverUrl
     );
   }
 
diff --git a/src/relayServerUtils.ts b/src/relayServerUtils.ts
index 78f071f..9a0751d 100644
--- a/src/relayServerUtils.ts
+++ b/src/relayServerUtils.ts
@@ -57,14 +57,11 @@ async function calculateFee(
   }
 
   const { transferFeePercentage } = appConfig;
-
+  const data = await relayRequest.request.data;
   //Even if transferFeePercentage = 0, it has priority over gas fee
-  if (
-    transferFeePercentage >= 0 &&
-    isTransferOrTransferFrom(relayRequest.request.data.toString())
-  ) {
+  if (transferFeePercentage >= 0 && isTransferOrTransferFrom(data.toString())) {
     const transferFee = await calculateFeeFromTransfer(
-      relayRequest.request.data.toString(),
+      data.toString(),
       transferFeePercentage,
       relayRequest
     );
@@ -97,12 +94,12 @@ async function calculateFixedUsdFee(
   envelopingRequest: EnvelopingRequest,
   fixedUsdFee: number
 ) {
-  const tokenAddress = envelopingRequest.request.tokenContract.toString();
-  const gasPrice = envelopingRequest.relayData.gasPrice.toString();
+  const tokenContractAddress = await envelopingRequest.request.tokenContract;
+  const gasPrice = await envelopingRequest.relayData.gasPrice;
 
   const provider = getProvider();
 
-  const tokenInstance = ERC20__factory.connect(tokenAddress, provider);
+  const tokenInstance = ERC20__factory.connect(tokenContractAddress, provider);
   const tokenSymbol = await tokenInstance.symbol();
 
   const exchangeRate = await getExchangeRate(US_DOLLAR_SYMBOL, tokenSymbol);
@@ -112,8 +109,8 @@ async function calculateFixedUsdFee(
 
   return await convertTokenToGas(
     fixedFeeInToken.toString(),
-    tokenAddress,
-    gasPrice
+    tokenContractAddress,
+    gasPrice.toString()
   );
 }
 
@@ -125,7 +122,7 @@ async function calculateFixedUsdFee(
 async function calculateFeeFromTransfer(
   data: string,
   transferFeePercentage: number,
-  relayRequest: EnvelopingRequest
+  envelopingRequest: EnvelopingRequest
 ): Promise<BigNumberJs> {
   if (!isTransferOrTransferFrom(data)) {
     return BigNumberJs(0);
@@ -140,11 +137,13 @@ async function calculateFeeFromTransfer(
   const valueInDecimal = BigNumberJs('0x' + valueHex);
 
   const feeInToken = valueInDecimal.multipliedBy(transferFeePercentage);
+  const tokenContractAddress = await envelopingRequest.request.tokenContract;
+  const gasPrice = await envelopingRequest.relayData.gasPrice;
 
   return await convertTokenToGas(
     feeInToken.toString(),
-    relayRequest.request.tokenContract.toString(),
-    relayRequest.relayData.gasPrice.toString()
+    tokenContractAddress,
+    gasPrice.toString()
   );
 }
 
@@ -196,8 +195,8 @@ async function validateIfGasAmountIsAcceptable(
   const relayRequest = envelopingTransaction.relayRequest;
 
   const estimatedDestinationGasCost = await estimateInternalCallGas({
-    from: relayRequest.relayData.callForwarder.toString(),
-    to: relayRequest.request.to.toString(),
+    from: relayRequest.relayData.callForwarder,
+    to: relayRequest.request.to,
     gasPrice: relayRequest.relayData.gasPrice,
     data: relayRequest.request.data,
   });
@@ -207,8 +206,9 @@ async function validateIfGasAmountIsAcceptable(
   );
 
   const { gas } = relayRequest.request as RelayRequestBody;
+  const gasValue = await gas;
   const bigGasFromRequestMaxAgreed = bigMaxEstimatedGasDeviation.multipliedBy(
-    gas.toString()
+    gasValue.toString()
   );
 
   if (estimatedDestinationGasCost.gt(bigGasFromRequestMaxAgreed.toFixed(0))) {
@@ -227,14 +227,19 @@ async function validateIfTokenAmountIsAcceptable(
     return;
   }
 
-  const { tokenAmount, tokenContract } =
-    envelopingTransaction.relayRequest.request;
-  const { gasPrice } = envelopingTransaction.relayRequest.relayData;
+  const {
+    request: { tokenAmount, tokenContract },
+    relayData: { gasPrice },
+  } = envelopingTransaction.relayRequest;
+
+  const tokenContractAddress = await tokenContract;
+  const tokenAmountValue = await tokenAmount;
+  const gasPriceValue = await gasPrice;
 
   const tokenAmountInGas = await convertTokenToGas(
-    tokenAmount.toString(),
-    tokenContract.toString(),
-    gasPrice.toString()
+    tokenAmountValue.toString(),
+    tokenContractAddress,
+    gasPriceValue.toString()
   );
 
   const isTokenAmountAcceptable = tokenAmountInGas.isGreaterThanOrEqualTo(
@@ -294,14 +299,12 @@ async function convertGasToTokenAndNative(
   relayRequest: EnvelopingRequest,
   initialEstimation: BigNumber
 ) {
-  const gasPrice = relayRequest.relayData.gasPrice.toString();
+  const gasPrice = await relayRequest.relayData.gasPrice;
+  const tokenContractAddress = await relayRequest.request.tokenContract;
 
   const provider = getProvider();
 
-  const tokenInstance = ERC20__factory.connect(
-    relayRequest.request.tokenContract.toString(),
-    provider
-  );
+  const tokenInstance = ERC20__factory.connect(tokenContractAddress, provider);
 
   const token: ExchangeToken = {
     instance: tokenInstance,
@@ -328,7 +331,7 @@ async function convertGasToTokenAndNative(
     valueInToken: initialEstimationInToken.toString(),
     valueInNative: initialEstimationInNative.toString(),
     exchangeRate: xRate,
-    gasPrice,
+    gasPrice: gasPrice.toString(),
   };
 }