diff --git a/client/api/creators.ts b/client/api/creators.ts
index b36b62ac..7b3262c4 100644
--- a/client/api/creators.ts
+++ b/client/api/creators.ts
@@ -51,7 +51,7 @@ export interface CreatorsResponse {
   };
 }
 
-const API_BASE = import.meta.env.VITE_API_BASE || "";
+const getApiBase = () => typeof window !== "undefined" ? window.location.origin : "";
 
 export async function getCreators(filters?: {
   arm?: string;
@@ -168,8 +168,10 @@ export async function endorseSkill(
   creatorId: string,
   skill: string,
 ): Promise<void> {
+  const apiBase = getApiBase();
+  if (!apiBase) throw new Error("No API base available");
   const response = await fetch(
-    `${API_BASE}/api/creators/${creatorId}/endorse`,
+    `${apiBase}/api/creators/${creatorId}/endorse`,
     {
       method: "POST",
       headers: { "Content-Type": "application/json" },