Ah sorry, it's is also definitely possible. The documentation lists the endpoints but it's still very WIP (the doc, not the endpoints): https://settle.network/documentation/

You can also refer to the source code[0] but that requires a bit more effort.

To interact with m.settle.network you would have to signup first using the command line (that's the easiest, to get your key, though doable over curl as well as you rightfully point out)

These are only pointers, but happy to answer any question async over email at stan@stripe.com as well!

[0] https://github.com/spolu/settle/tree/master/mint/endpoint