diff --git a/bimex-frontend/.env.example b/bimex-frontend/.env.example
index 0e67afd..dd33fdd 100644
--- a/bimex-frontend/.env.example
+++ b/bimex-frontend/.env.example
@@ -15,12 +15,20 @@ VITE_LAUNCHTUBE_JWT=
 # Get project ID at https://cloud.walletconnect.com
 VITE_WALLETCONNECT_PROJECT_ID=c4f79cc821944d9680842e34466bfda0
 
-# Indexer API URL (for faucet and data queries)
+# Indexer REST (faucet, transparencia, casos de éxito)
 VITE_API_URL=http://localhost:3001
 
-# Indexer API (for SSE real-time updates)
+# Indexer (SSE, IPFS upload proxy)
 VITE_INDEXER_URL=http://localhost:3001
 
+# Same-origin /api proxy (production or staging):
+# 1. In vercel.json, add /api/:path* → https://<real-indexer-host>/:path* (never commit placeholder hosts).
+#    Staging is wired for bimex-staging.vercel.app → bimex-indexer-staging.vercel.app in vercel.json.
+# 2. In Vercel env vars set:
+#    VITE_API_URL=/api
+#    VITE_INDEXER_URL=/api
+# connect-src 'self' in CSP covers same-origin /api. SSE via Vercel proxy may hit connection duration limits.
+
 # Supabase (for notification preferences)
 VITE_SUPABASE_URL=https://<project>.supabase.co
 VITE_SUPABASE_ANON_KEY=<anon_key>
diff --git a/bimex-frontend/vercel.json b/bimex-frontend/vercel.json
index bc1d1c3..0078dd8 100644
--- a/bimex-frontend/vercel.json
+++ b/bimex-frontend/vercel.json
@@ -1,5 +1,12 @@
 {
-  "rewrites": [{ "source": "/(.*)", "destination": "/index.html" }],
+  "rewrites": [
+    {
+      "source": "/api/:path*",
+      "has": [{ "type": "host", "value": "bimex-staging.vercel.app" }],
+      "destination": "https://bimex-indexer-staging.vercel.app/:path*"
+    },
+    { "source": "/(.*)", "destination": "/index.html" }
+  ],
   "headers": [
     {
       "source": "/(.*)",