diff --git a/web/app/themes/badegg/app/API/Admin.php b/web/app/themes/badegg/app/API/Admin.php
new file mode 100644
index 0000000..37c10a0
--- /dev/null
+++ b/web/app/themes/badegg/app/API/Admin.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace App\API;
+
+class Admin
+{
+    public function __construct()
+    {
+        add_action( 'rest_api_init', [$this, 'blocks']);
+    }
+
+    public function blocks( )
+    {
+        register_rest_route('badegg/v1', '/blocks/container_width', [
+            'methods' => 'GET',
+            'callback' => [ $this, 'container_width'],
+            'permission_callback' => function(){
+                return true;
+            },
+        ]);
+    }
+
+    public function container_width()
+    {
+        $containerWidths = [
+            [ 'label' => __('Auto', 'badegg'),          'value' => 0        ],
+            [ 'label' => __('Narrow', 'badegg'),        'value' => 'narrow' ],
+            [ 'label' => __('Small', 'badegg'),         'value' => 'small'  ],
+            [ 'label' => __('Medium', 'badegg'),        'value' => 'medium' ],
+            [ 'label' => __('Large', 'badegg'),         'value' => 'large'  ],
+            [ 'label' => __('Edge to edge', 'badegg'),  'value' => 'full'   ],
+        ];
+
+        return rest_ensure_response($containerWidths);
+    }
+}