This already exists (L402 -- formerly known as LSAT), and pre-dates x402 by several years: * https://lightning.engineering/posts/2020-03-30-lsat/ * https:

This already exists (L402 -- formerly known as LSAT), and pre-dates x402 by several years: * https://lightning.engineering/posts/2020-03-30-lsat/ * https://docs.lightning.engineering/the-lightning-network/l402