diff --git a/swh/core/api/__init__.py b/swh/core/api/__init__.py
--- a/swh/core/api/__init__.py
+++ b/swh/core/api/__init__.py
@@ -131,6 +131,10 @@
 
     @staticmethod
     def __add_endpoint(meth_name, meth, attributes):
+        if meth_name in attributes:
+            # Overridden by the class
+            return
+
         wrapped_meth = inspect.unwrap(meth)
 
         @functools.wraps(meth)  # Copy signature and doc