I experience this as well, when trying to work on my libraries. For my Kotlin library 50% of the tests run through and then it stops working and all the requests are rejected with 403. My Python library can't access the API at all at the moment from my PC.

Note: my scripts are also written in Python. If someone needs something to test with: backup-all.py from my backup project. It's really small, so easy to see what's going on: https://github.com/Tillerz/worldanvil-templates/tree/master/tools/backup

Should be working now, can you take a look?

403 still, both direct access and via cloudflare worker.