diff --git a/config/routes.rb b/config/routes.rb
index 3d9b626..c5dd020 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -29,10 +29,12 @@ Rails.application.routes.draw do
     resources :versions, only: [:show]
   end
 
-  namespace :api do
-    namespace :v1 do
-      resources :cards, only: [:index, :show]
-      resources :links, only: [:index, :show]
+  constraints subdomain: 'api' do
+    namespace :api, path: nil do
+      namespace :v1 do
+        resources :cards, only: [:index, :show]
+        resources :links, only: [:index, :show]
+      end
     end
   end
 end