Notes on x402 agent payments

Notes on x402 agent payments, stablecoin payments, and what a buyer can check before paying. How AI agents pay with stablecoins.

What is x402? The HTTP status code that waited 28 years for a job
2026-08-13
What is x402? It's the machine-payment protocol that finally gave HTTP 402 Payment Required something to do, letting an AI agent pay for an API call in a single request. Here's how it works, where it stands today, and the one thing it deliberately doesn't tell you.
Why agent-to-agent payments need a trust score
2026-07-21
x402 lets an AI agent pay for an API call in one HTTP round trip, but it says nothing about whether the wallet on the other end is worth paying. Here's the gap vet402 fills, and how the score is built. A purchase record is a separate result from the score.