Worth noting too that this project doesn’t actually require the access to be paid. It could return 401 Unauthorised instead of 402 Payment Required, if access is whitelisted for example.

It could be used to check a pubkey against premium relay membership for extra services, for things like accessing your own backups, uploading media, or translation, etc. Basically any Nostr HTTP Auth scenarios.

And it’s written as middleware, so you can use it as a rust library/crate in your project.