Built a working proof-of-concept adding TON blockchain support to x402.org — Coinbase's open payment protocol for HTTP APIs. Any API can accept crypto payments natively, no accounts or sessions needed. Especially relevant for AI agents paying for tools on the fly.

The PR adds gasless USDT payments via W5 wallet — client signs, relay submits, zero TON needed for gas.

Spec PR: https://github.com/coinbase/x402/pull/1455
Demo repo: https://github.com/ohld/x402-ton-poc

If you find this useful — feel free to leave feedback on the spec, support the PR, or contribute. The more signal from the community, the better the chances it gets merged.