RFC 8908 + HTTP 402 + Lightning
The web's missing payment status code.
Below is a live, end-to-end L402 challenge. Hit the endpoint → get 402 Payment Required
with a Lightning invoice and macaroon → pay it → return the preimage → unlock the content.
01
Request the resource
Select a protocol and request a payment challenge to unlock the premium resource.
HTTP/1.1 402 Payment Required
Www-Authenticate: L402 macaroon="..."
Waiting for payment...