Hi,

The rpc decorator url parameter can be omitted by decorating the method with staticmethod or classmethod (example)
I was going to give a longer reply but didn't find the time. Hopefully tomorrow.

The generated API can be extended with custom routes using the flask @app.route decorator. If you want this to show up in the swagger, you will have to create the swagger/oas spec yourself and merge it with the generated oas (example)

You can also use the safrs @jsonapi_rpc decorator. as explained in the wiki here .

A third way to add custom endpoints is by simulating a safrs jsonapi class (https://github.com/thomaxxl/safrs/wiki/Instances-without-a-SQLAlchemy-model) . I noticed there's a bug here that will be fixed in the next release.