diff --git a/src/LaravelBitunixApi.php b/src/LaravelBitunixApi.php
index 266fe56..4776360 100644
--- a/src/LaravelBitunixApi.php
+++ b/src/LaravelBitunixApi.php
@@ -397,4 +397,9 @@ class LaravelBitunixApi implements ChangeLeverageRequestContract, ChangeMarginMo
             'json' => $body,
         ]);
     }
+
+    protected function resolveRateLimitIdentity(): string
+    {
+        return (string) config('bitunix-api.api_key');
+    }
 }