diff --git a/SeacmsApi.php b/SeacmsApi.php
index cb13386..637932e 100644
--- a/SeacmsApi.php
+++ b/SeacmsApi.php
@@ -6,6 +6,7 @@ use SeaCMS\Api\ApiAware;
 use SeaCMS\Api\BadMethodException;
 use SeaCMS\Api\Cookies;
 use SeaCMS\Api\JsonResponse;
+use SeaCMS\Api\LateApiAware;
 use SeaCMS\Api\NotFoundRouteException;
 use SeaCMS\Api\SpecialOutputException;
 
@@ -123,7 +124,17 @@ class SeacmsApi extends AbstractPicoPlugin implements ApiAware
                 if (is_array($routes)){
                     foreach($routes as $route => $methodName){
                         if (is_string($methodName) && method_exists($plugin,$methodName)){
-                            $this->routes[$route] = [$plugin,$methodName];
+                            $this->routes[$route] = [$plugin,$methodName,false];
+                        }
+                    }
+                }
+                if ($plugin instanceof LateApiAware){
+                    $routes = $plugin->registerLateApiRoutes();
+                    if (is_array($routes)){
+                        foreach($routes as $route => $methodName){
+                            if (is_string($methodName) && method_exists($plugin,$methodName)){
+                                $this->routes[$route] = [$plugin,$methodName,true];
+                            }
                         }
                     }
                 }
@@ -162,6 +173,9 @@ class SeacmsApi extends AbstractPicoPlugin implements ApiAware
      */
     public function onPageRendered(&$output)
     {
+        if ($this->resolveApi($output,true)){
+            $output = $output->send();
+        }
         if (JsonResponse::canSendHeaders()){
             $this->getCookies()->sendCookiesOnce();
         }
@@ -170,9 +184,10 @@ class SeacmsApi extends AbstractPicoPlugin implements ApiAware
     /**
      * resolve api
      * @param null|string|JsonResponse $output
+     * @param bool $isLate
      * @return bool $outputChanged
      */
-    protected function resolveApi(&$output): bool
+    protected function resolveApi(&$output, bool $isLate = false): bool
     {
         $outputChanged = false;
         if (isset($_GET['api'])){
@@ -197,6 +212,14 @@ class SeacmsApi extends AbstractPicoPlugin implements ApiAware
                 $response = null;
                 try {
                     $data = $this->searchCorrespondingRoute($route);
+                    if ($data['isLate'] !== $isLate){
+                        if ($isLate){
+                            return new Exception('Calling an api route but catch onPageRedered whereas should be caught onThemeLoading !');
+                        } else {
+                            ob_end_clean();
+                            return false;
+                        }
+                    }
                     $response = call_user_func_array([$data['plugin'],$data['methodName']],$data['params']);
                     if (!($response instanceof JsonResponse)){
                         $response = null;
@@ -275,7 +298,8 @@ class SeacmsApi extends AbstractPicoPlugin implements ApiAware
                 return [
                     'plugin' => $data[0],
                     'methodName' => $data[1],
-                    'params' => $params
+                    'params' => $params,
+                    'isLate' => $data[2]
                 ];
             } elseif (!$badMethod && array_key_exists((($method == 'GET') ? 'POST' : 'GET' )." $searchingRoute",$this->routes)){
                 $badMethod = true;
diff --git a/src/LateApiAware.php b/src/LateApiAware.php
new file mode 100644
index 0000000..4e46f33
--- /dev/null
+++ b/src/LateApiAware.php
@@ -0,0 +1,19 @@
+<?php
+// SPDX-License-Identifier: EUPL-1.2
+// Authors: see README.md
+
+namespace SeaCMS\Api;
+
+use SeaCMS\Api\ApiAware;
+
+/**
+ * Response for http response
+ */
+interface LateApiAware extends ApiAware
+{
+    /**
+     * return api routes
+     * @return array
+     */
+    public function registerLateApiRoutes():array;
+}