diff --git a/SeacmsApi.php b/SeacmsApi.php
index 547e440..37ca0ac 100644
--- a/SeacmsApi.php
+++ b/SeacmsApi.php
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: EUPL-1.2
 // Authors: see README.md
 
+use SeaCMS\Api\ApiAware;
 use SeaCMS\Api\BadMethodException;
 use SeaCMS\Api\JsonResponse;
 use SeaCMS\Api\NotFoundRouteException;
@@ -9,7 +10,7 @@ use SeaCMS\Api\NotFoundRouteException;
 /**
  * An api plugin for Pico 3.
  */
-class SeacmsApi extends AbstractPicoPlugin
+class SeacmsApi extends AbstractPicoPlugin implements ApiAware
 {
     /**
      * Pico API version.
@@ -67,7 +68,7 @@ class SeacmsApi extends AbstractPicoPlugin
     {
         $this->routesOnPageRendered = [];
         foreach($plugins as $plugin){
-            if (method_exists($plugin,'registerOnPageRenderedApiRoutes')){
+            if ($plugin instanceof ApiAware){
                 $routes = $plugin->registerOnPageRenderedApiRoutes();
                 if (is_array($routes)){
                     foreach($routes as $route => $methodName){
diff --git a/src/ApiAware.php b/src/ApiAware.php
new file mode 100644
index 0000000..3662032
--- /dev/null
+++ b/src/ApiAware.php
@@ -0,0 +1,17 @@
+<?php
+// SPDX-License-Identifier: EUPL-1.2
+// Authors: see README.md
+
+namespace SeaCMS\Api;
+
+/**
+ * Response for http response
+ */
+interface ApiAware
+{
+    /**
+     * return api routes
+     * @return array
+     */
+    public function registerOnPageRenderedApiRoutes():array;
+}