Having been prototyping a Nostr payed lightning CDN, I’m circling back to read up on LSAT again.
Effectively it leverages the 402 Payment Required HTTP response, and a WWW-Authentication header (exactly my approach) and acts as a reverse proxy in front of a service. It doesn’t require private key auth, which seems great, but you also need to store state for a macaroon and a payment hash (which also allows sharing). LSAT does enable fine grain pay as you go payment models - perhaps interesting for Nostr services.
LSAT doesn’t seem to have really taken off since 2020. Maybe Nostr’s zap and lightning adoption could help growth. #[0] just released this LSAT demo as well, with split payments. https://weather-lightning.bumi17.repl.co
Anyway, I think it’s worth exploring more and understanding what options and approaches we have, that may be useful as part of Nostr functionality and economy.