diff --git a/src/includes/classes.php b/src/includes/classes.php
index db91f5e..fc86b9f 100644
--- a/src/includes/classes.php
+++ b/src/includes/classes.php
@@ -124,6 +124,11 @@ abstract class MTTExtension
         return null;
     }
 
+    public function httpApiUrlPrefix()
+    {
+        return get_unsafe_mttinfo('api_url'). 'ext/'. $this::bundleId;
+    }
+
 }
 
 interface MTTHttpApiExtender