Comment by yellow_lead

I looked into this before too. Ankiweb (the place where cards created on Anki sync to) does not provide a rest API. The service is free though. It makes sense they may not want automated clients.

There is an implementation of their sync server, which you can self host. And it has a REST API

https://github.com/dsnopek/anki-sync-server

I think I ran into a blocker with it not supporting something I needed last time I tried to use it though.