diff --git a/libs/sdk-js/package.json b/libs/sdk-js/package.json
index a10bcdab8..659b087ca 100644
--- a/libs/sdk-js/package.json
+++ b/libs/sdk-js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@langchain/langgraph-sdk",
-  "version": "0.0.6",
+  "version": "0.0.7",
   "description": "Client library for interacting with the LangGraph API",
   "type": "module",
   "packageManager": "yarn@1.22.19",
diff --git a/libs/sdk-js/src/client.mts b/libs/sdk-js/src/client.mts
index fbf2dd12c..96654f0f4 100644
--- a/libs/sdk-js/src/client.mts
+++ b/libs/sdk-js/src/client.mts
@@ -24,6 +24,7 @@ import {
 
 interface ClientConfig {
   apiUrl?: string;
+  apiKey?: string;
   callerOptions?: AsyncCallerParams;
   timeoutMs?: number;
   defaultHeaders?: Record<string, string | null | undefined>;
@@ -48,6 +49,9 @@ class BaseClient {
     this.timeoutMs = config?.timeoutMs || 12_000;
     this.apiUrl = config?.apiUrl || "http://localhost:8123";
     this.defaultHeaders = config?.defaultHeaders || {};
+    if (config?.apiKey != null) {
+      this.defaultHeaders["X-Api-Key"] = config.apiKey;
+    }
   }
 
   protected prepareFetchOptions(