diff --git a/.env.example b/.env.example
index ab42758616..3d9cf60702 100644
--- a/.env.example
+++ b/.env.example
@@ -83,6 +83,9 @@ NEXT_PUBLIC_STRIPE_PRO_PLAN_PRODUCT=
 NEXT_PUBLIC_STRIPE_PRO_PLAN_PRICE=
 NEXT_PUBLIC_STRIPE_PREMIUM_PLAN_PRICE=
 NEXT_PUBLIC_STRIPE_FREE_PLAN_PRICE=
+
+# Use for internal Public API Keys and optional
+API_KEY_PREFIX=cal_
 # ***********************************************************************************************************
 
 # - E-MAIL SETTINGS *****************************************************************************************
diff --git a/apps/web/server/routers/viewer/apiKeys.tsx b/apps/web/server/routers/viewer/apiKeys.tsx
index 7d6e9e27b6..6959980153 100644
--- a/apps/web/server/routers/viewer/apiKeys.tsx
+++ b/apps/web/server/routers/viewer/apiKeys.tsx
@@ -37,7 +37,7 @@ export const apiKeysRouter = createProtectedRouter()
           hashedKey: hashedApiKey,
         },
       });
-      const prefixedApiKey = `${process.env.API_KEY_PREFIX ?? "pt_secret_"}${apiKey}`;
+      const prefixedApiKey = `${process.env.API_KEY_PREFIX ?? "cal_"}${apiKey}`;
       return prefixedApiKey;
     },
   })