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
@@ -179,7 +179,7 @@
             post_data.pop("db", None)
 
             # Send the request.
-            return self.post(meth._endpoint_path, post_data)
+            return self._post(meth._endpoint_path, post_data)
 
         if meth_name not in attributes:
             attributes[meth_name] = meth_