diff --git a/packages/core-sdk/src/client.ts b/packages/core-sdk/src/client.ts
index 272fae48..005c9e6e 100644
--- a/packages/core-sdk/src/client.ts
+++ b/packages/core-sdk/src/client.ts
@@ -1,6 +1,5 @@
 import axios, { AxiosInstance } from "axios";
 import { createPublicClient, createWalletClient, http, PublicClient, WalletClient } from "viem";
-import { sepolia } from "viem/chains";
 import * as dotenv from "dotenv";
 
 import { StoryConfig, StoryReadOnlyConfig } from "./types/config";
@@ -23,6 +22,7 @@ import { LicenseClient } from "./resources/license";
 import { RelationshipClient } from "./resources/relationship";
 import { RelationshipTypeClient } from "./resources/relationshipType";
 import { RelationshipTypeReadOnlyClient } from "./resources/relationshipTypeReadOnly";
+import { chainStringToViemChain } from "./utils/utils";
 
 if (typeof process !== "undefined") {
   dotenv.config();
@@ -56,7 +56,7 @@ export class StoryClient {
     this.isReadOnly = isReadOnly;
 
     const clientConfig = {
-      chain: this.config.chain || sepolia,
+      chain: chainStringToViemChain(this.config.chainId || "sepolia"),
       transport: this.config.transport || http(process.env.RPC_PROVIDER_URL),
     };
 
diff --git a/packages/core-sdk/src/index.ts b/packages/core-sdk/src/index.ts
index bedf17da..0e7a3356 100644
--- a/packages/core-sdk/src/index.ts
+++ b/packages/core-sdk/src/index.ts
@@ -16,7 +16,7 @@ export { TransactionClient } from "./resources/transaction";
 export { PlatformClient } from "./utils/platform";
 export { AddressZero, HashZero } from "./constants/common";
 
-export type { StoryConfig, StoryReadOnlyConfig } from "./types/config";
+export type { StoryConfig, StoryReadOnlyConfig, SupportedChainIds } from "./types/config";
 export type { Client, ReadOnlyClient } from "./types/client";
 export type { Hex, TypedData } from "./types/common";
 
diff --git a/packages/core-sdk/src/types/config.ts b/packages/core-sdk/src/types/config.ts
index c196bffe..89164462 100644
--- a/packages/core-sdk/src/types/config.ts
+++ b/packages/core-sdk/src/types/config.ts
@@ -1,4 +1,11 @@
-import { Account, Chain, Transport } from "viem";
+import { Account, Transport } from "viem";
+
+/**
+ * Supported chains. For convenience, both name or chain ID are supported.
+ *
+ * @public
+ */
+export type SupportedChainIds = "11155111" | "sepolia" | "1" | "mainnet";
 
 /**
  * Configuration for the SDK Client.
@@ -15,6 +22,6 @@ export interface StoryConfig extends StoryReadOnlyConfig {
  * @public
  */
 export interface StoryReadOnlyConfig {
-  readonly chain?: Chain;
+  readonly chainId?: SupportedChainIds;
   readonly transport?: Transport;
 }
diff --git a/packages/core-sdk/src/utils/utils.ts b/packages/core-sdk/src/utils/utils.ts
index f7e57aa5..91d0cc66 100644
--- a/packages/core-sdk/src/utils/utils.ts
+++ b/packages/core-sdk/src/utils/utils.ts
@@ -1,10 +1,19 @@
 import { Hash } from "viem/types/misc";
 import { DecodeEventLogReturnType } from "viem/_types/utils/abi/decodeEventLog";
-import { Abi, decodeEventLog, PublicClient, encodeAbiParameters, parseAbiParameters } from "viem";
+import {
+  Abi,
+  decodeEventLog,
+  PublicClient,
+  encodeAbiParameters,
+  parseAbiParameters,
+  Chain,
+} from "viem";
 import { InferEventName } from "viem/types/contract";
+import { mainnet, sepolia } from "viem/chains";
 
 import { Hex, TypedData } from "../types/common";
 import { DERIVATIVES_ALLOWED_OPTIONS, PARAMS_TAG } from "../constants/license";
+import { SupportedChainIds } from "../types/config";
 
 export function isIntegerString(s: string): boolean {
   const num = Number(s);
@@ -177,3 +186,14 @@ export function paramsTagValueDecoder(paramTag: Hex, paramValue: unknown) {
 
   return { tag: parsedTag, value, type };
 }
+
+export function chainStringToViemChain(chainId: SupportedChainIds): Chain {
+  switch (chainId) {
+    case "1" || "mainnet":
+      return mainnet;
+    case "11155111" || "sepolia":
+      return sepolia;
+    default:
+      throw new Error(`chainId ${chainId} not supported`);
+  }
+}