diff --git a/package.json b/package.json
index 9854270..f69d30e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gelatonetwork/relay-sdk",
-  "version": "5.2.0",
+  "version": "5.3.0",
   "description": "SDK to integrate with Gelato Relay",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/index.ts b/src/index.ts
index d057025..badac14 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -95,19 +95,22 @@ export class GelatoRelay {
   /**
    * @param {CallWithSyncFeeRequest} request - CallWithSyncFee request to be relayed by Gelato Executors
    * @param {RelayRequestOptions} [options] - Optional Relay configuration
+   * @param {string} [sponsorApiKey] Optional Sponsor API key to be used for the call
    * @returns {Promise<RelayResponse>} Response object with taskId parameter
    *
    */
   callWithSyncFee = (
     request: CallWithSyncFeeRequest,
-    options?: RelayRequestOptions
+    options?: RelayRequestOptions,
+    sponsorApiKey?: string
   ): Promise<RelayResponse> =>
-    library.relayWithSyncFee({ request, options }, this.#config);
+    library.relayWithSyncFee({ request, sponsorApiKey, options }, this.#config);
 
   /**
    * @param {CallWithSyncFeeERC2771Request | CallWithSyncFeeConcurrentERC2771Request} request - Call with sync fee: Sequential ERC2771 or Concurrent ERC2771 request to be relayed by Gelato Executors
    * @param {ethers.BrowserProvider | ethers.Wallet} walletOrProvider - BrowserProvider [front-end] or Wallet [back-end] to sign the payload
    * @param {RelayRequestOptions} [options] - Optional Relay configuration
+   * @param {string} [sponsorApiKey] Optional Sponsor API key to be used for the call
    * @returns {Promise<RelayResponse>} Response object with taskId parameter
    *
    */
@@ -116,12 +119,14 @@ export class GelatoRelay {
       | CallWithSyncFeeERC2771Request
       | CallWithSyncFeeConcurrentERC2771Request,
     walletOrProvider: ethers.BrowserProvider | ethers.Wallet,
-    options?: RelayRequestOptions
+    options?: RelayRequestOptions,
+    sponsorApiKey?: string
   ): Promise<RelayResponse> =>
     library.relayWithCallWithSyncFeeERC2771(
       {
         request,
         walletOrProvider,
+        sponsorApiKey,
         options,
       },
       this.#config
@@ -231,6 +236,7 @@ export class GelatoRelay {
    * @param {BaseCallWithSyncFeeParams} syncFeeParams - Call with Sync Fee parameters
    * @param {SignatureData["signature"]} signature - Signature that can be obtained from getSignatureDataERC2771
    * @param {RelayRequestOptions} [options] - Optional Relay configuration
+   * @param {string} [sponsorApiKey] Optional Sponsor API key to be used for the call
    * @returns {Promise<RelayResponse>} Response object with taskId parameter
    *
    */
@@ -238,7 +244,8 @@ export class GelatoRelay {
     struct: SignatureData["struct"],
     syncFeeParams: BaseCallWithSyncFeeParams,
     signature: SignatureData["signature"],
-    options?: RelayRequestOptions
+    options?: RelayRequestOptions,
+    sponsorApiKey?: string
   ): Promise<RelayResponse> =>
     library.callWithSyncFeeERC2771WithSignature(
       {
@@ -246,6 +253,7 @@ export class GelatoRelay {
         syncFeeParams,
         signature,
         options,
+        sponsorApiKey,
       },
       this.#config
     );
diff --git a/src/lib/callWithSyncFee/index.ts b/src/lib/callWithSyncFee/index.ts
index 969b91b..c951457 100644
--- a/src/lib/callWithSyncFee/index.ts
+++ b/src/lib/callWithSyncFee/index.ts
@@ -1,7 +1,9 @@
 import { getHttpErrorMessage, post } from "../../utils";
 import { isNetworkSupported } from "../network";
 import {
+  ApiKey,
   Config,
+  Optional,
   RelayCall,
   RelayRequestOptions,
   RelayResponse,
@@ -12,12 +14,13 @@ import { CallWithSyncFeeRequest } from "./types";
 export const relayWithSyncFee = async (
   payload: {
     request: CallWithSyncFeeRequest;
+    sponsorApiKey?: string;
     options?: RelayRequestOptions;
   },
   config: Config
 ): Promise<RelayResponse> => {
   try {
-    const { request, options } = payload;
+    const { request, options, sponsorApiKey } = payload;
     const isSupported = await isNetworkSupported(
       { chainId: request.chainId },
       config
@@ -26,7 +29,9 @@ export const relayWithSyncFee = async (
       throw new Error(`Chain id [${request.chainId}] is not supported`);
     }
     return await post<
-      CallWithSyncFeeRequest & RelayRequestOptions,
+      CallWithSyncFeeRequest &
+        RelayRequestOptions &
+        Optional<ApiKey, "sponsorApiKey">,
       RelayResponse
     >(
       {
@@ -34,8 +39,10 @@ export const relayWithSyncFee = async (
         request: {
           ...request,
           isRelayContext: request.isRelayContext ?? true,
-          ...options,
+          sponsorApiKey,
           chainId: request.chainId.toString(),
+          gasLimit: options?.gasLimit ? options.gasLimit.toString() : undefined,
+          retries: options?.retries,
         },
       },
       config
diff --git a/src/lib/erc2771/callWithSyncFeeERC2771/index.ts b/src/lib/erc2771/callWithSyncFeeERC2771/index.ts
index 873a928..49f46c2 100644
--- a/src/lib/erc2771/callWithSyncFeeERC2771/index.ts
+++ b/src/lib/erc2771/callWithSyncFeeERC2771/index.ts
@@ -2,9 +2,11 @@ import { ethers } from "ethers";
 
 import { post } from "../../../utils";
 import {
+  ApiKey,
   BaseCallWithSyncFeeParams,
   ConcurrencyOptions,
   Config,
+  Optional,
   RelayCall,
   RelayRequestOptions,
   RelayResponse,
@@ -26,12 +28,13 @@ export const relayWithCallWithSyncFeeERC2771 = async (
       | CallWithSyncFeeERC2771Request
       | CallWithSyncFeeConcurrentERC2771Request;
     walletOrProvider: ethers.BrowserProvider | ethers.Wallet;
+    sponsorApiKey?: string;
     options?: RelayRequestOptions;
   },
   config: Config
 ): Promise<RelayResponse> => {
   try {
-    const { request, walletOrProvider, options } = payload;
+    const { request, walletOrProvider, options, sponsorApiKey } = payload;
     if (!walletOrProvider.provider) {
       throw new Error(`Missing provider`);
     }
@@ -51,6 +54,7 @@ export const relayWithCallWithSyncFeeERC2771 = async (
           BaseCallWithSyncFeeParams &
           RelayRequestOptions &
           UserAuthSignature &
+          Optional<ApiKey, "sponsorApiKey"> &
           ConcurrencyOptions,
         RelayResponse
       >(
@@ -58,11 +62,15 @@ export const relayWithCallWithSyncFeeERC2771 = async (
           relayCall: RelayCall.CallWithSyncFeeERC2771,
           request: {
             ...safeTransformStruct(struct),
-            ...options,
             feeToken,
             isRelayContext: isRelayContext ?? true,
             userSignature: signature,
             isConcurrent,
+            sponsorApiKey,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
@@ -82,6 +90,7 @@ export const relayWithCallWithSyncFeeERC2771 = async (
           BaseCallWithSyncFeeParams &
           RelayRequestOptions &
           UserAuthSignature &
+          Optional<ApiKey, "sponsorApiKey"> &
           ConcurrencyOptions,
         RelayResponse
       >(
@@ -89,11 +98,15 @@ export const relayWithCallWithSyncFeeERC2771 = async (
           relayCall: RelayCall.CallWithSyncFeeERC2771,
           request: {
             ...safeTransformStruct(struct),
-            ...options,
             feeToken,
             isRelayContext: isRelayContext ?? true,
             userSignature: signature,
             isConcurrent,
+            sponsorApiKey,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
diff --git a/src/lib/erc2771/callWithSyncFeeERC2771WithSignature/index.ts b/src/lib/erc2771/callWithSyncFeeERC2771WithSignature/index.ts
index cfe39a8..c21989e 100644
--- a/src/lib/erc2771/callWithSyncFeeERC2771WithSignature/index.ts
+++ b/src/lib/erc2771/callWithSyncFeeERC2771WithSignature/index.ts
@@ -1,9 +1,11 @@
 import { isConcurrentStruct, post } from "../../../utils";
 import { isNetworkSupported } from "../../network";
 import {
+  ApiKey,
   BaseCallWithSyncFeeParams,
   ConcurrencyOptions,
   Config,
+  Optional,
   RelayCall,
   RelayRequestOptions,
   RelayResponse,
@@ -21,11 +23,13 @@ export const callWithSyncFeeERC2771WithSignature = async (
     syncFeeParams: BaseCallWithSyncFeeParams;
     signature: string;
     options?: RelayRequestOptions;
+    sponsorApiKey?: string;
   },
   config: Config
 ): Promise<RelayResponse> => {
   try {
-    const { signature, struct, syncFeeParams, options } = payload;
+    const { signature, struct, syncFeeParams, options, sponsorApiKey } =
+      payload;
 
     const isSupported = await isNetworkSupported(
       { chainId: struct.chainId },
@@ -42,6 +46,7 @@ export const callWithSyncFeeERC2771WithSignature = async (
           BaseCallWithSyncFeeParams &
           RelayRequestOptions &
           UserAuthSignature &
+          Optional<ApiKey, "sponsorApiKey"> &
           ConcurrencyOptions,
         RelayResponse
       >(
@@ -50,10 +55,14 @@ export const callWithSyncFeeERC2771WithSignature = async (
           request: {
             ...safeTransformStruct(struct),
             ...syncFeeParams,
-            ...options,
             isRelayContext: syncFeeParams.isRelayContext ?? true,
             userSignature: signature,
             isConcurrent,
+            sponsorApiKey,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
@@ -65,6 +74,7 @@ export const callWithSyncFeeERC2771WithSignature = async (
           BaseCallWithSyncFeeParams &
           RelayRequestOptions &
           UserAuthSignature &
+          Optional<ApiKey, "sponsorApiKey"> &
           ConcurrencyOptions,
         RelayResponse
       >(
@@ -73,10 +83,14 @@ export const callWithSyncFeeERC2771WithSignature = async (
           request: {
             ...safeTransformStruct(struct),
             ...syncFeeParams,
-            ...options,
             isRelayContext: syncFeeParams.isRelayContext ?? true,
             userSignature: signature,
             isConcurrent,
+            sponsorApiKey,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
diff --git a/src/lib/erc2771/sponsoredCallERC2771/index.ts b/src/lib/erc2771/sponsoredCallERC2771/index.ts
index 3902ca0..6fff669 100644
--- a/src/lib/erc2771/sponsoredCallERC2771/index.ts
+++ b/src/lib/erc2771/sponsoredCallERC2771/index.ts
@@ -72,10 +72,13 @@ const sponsoredCallERC2771 = async (
           relayCall: RelayCall.SponsoredCallERC2771,
           request: {
             ...safeTransformStruct(struct),
-            ...options,
             userSignature: signature,
             sponsorApiKey,
             isConcurrent,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
@@ -105,10 +108,13 @@ const sponsoredCallERC2771 = async (
           relayCall: RelayCall.SponsoredCallERC2771,
           request: {
             ...safeTransformStruct(struct),
-            ...options,
             userSignature: signature,
             sponsorApiKey,
             isConcurrent,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
diff --git a/src/lib/erc2771/sponsoredCallERC2771WithSignature/index.ts b/src/lib/erc2771/sponsoredCallERC2771WithSignature/index.ts
index 874b572..35b4fb1 100644
--- a/src/lib/erc2771/sponsoredCallERC2771WithSignature/index.ts
+++ b/src/lib/erc2771/sponsoredCallERC2771WithSignature/index.ts
@@ -49,10 +49,13 @@ export const sponsoredCallERC2771WithSignature = async (
           relayCall: RelayCall.SponsoredCallERC2771,
           request: {
             ...safeTransformStruct(struct),
-            ...options,
             userSignature: signature,
             sponsorApiKey,
             isConcurrent,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
@@ -71,10 +74,13 @@ export const sponsoredCallERC2771WithSignature = async (
           relayCall: RelayCall.SponsoredCallERC2771,
           request: {
             ...safeTransformStruct(struct),
-            ...options,
             userSignature: signature,
             sponsorApiKey,
             isConcurrent,
+            gasLimit: options?.gasLimit
+              ? options.gasLimit.toString()
+              : undefined,
+            retries: options?.retries,
           },
         },
         config
diff --git a/src/lib/sponsoredCall/index.ts b/src/lib/sponsoredCall/index.ts
index a447f5e..9299ccf 100644
--- a/src/lib/sponsoredCall/index.ts
+++ b/src/lib/sponsoredCall/index.ts
@@ -61,8 +61,9 @@ const sponsoredCall = async (
         relayCall: RelayCall.SponsoredCall,
         request: {
           ...struct,
-          ...options,
           sponsorApiKey,
+          gasLimit: options?.gasLimit ? options.gasLimit.toString() : undefined,
+          retries: options?.retries,
         },
       },
       config
diff --git a/src/lib/types/index.ts b/src/lib/types/index.ts
index 57c7f13..268aa08 100644
--- a/src/lib/types/index.ts
+++ b/src/lib/types/index.ts
@@ -68,5 +68,11 @@ export type Config = {
 };
 
 export type SafeRequestPayload<T> = {
-  [K in keyof T]: T[K] extends bigint ? string : T[K];
+  [K in keyof T]: T[K] extends bigint
+    ? string
+    : T[K] extends bigint | undefined
+    ? string | undefined
+    : T[K] extends object
+    ? SafeRequestPayload<T[K]>
+    : T[K];
 };