diff --git a/lib/sanbase_web/graphql/schema/queries/billing_queries.ex b/lib/sanbase_web/graphql/schema/queries/billing_queries.ex
index 0a3ad3859..9636ec580 100644
--- a/lib/sanbase_web/graphql/schema/queries/billing_queries.ex
+++ b/lib/sanbase_web/graphql/schema/queries/billing_queries.ex
@@ -42,6 +42,7 @@ defmodule SanbaseWeb.Graphql.Schema.BillingQueries do
       meta(access: :free)
 
       arg(:coupon, non_null(:string))
+      middleware(JWTAuth)
 
       resolve(&BillingResolver.get_coupon/3)
     end