Field notes from running an x402 gateway — written for the people
operating endpoints and the people building agents that pay them.
The x402 envelope bug that quietly tanks your trust score 793 probes, zero valid envelopes, and a public 'avoid' label on a healthy endpoint. The header/body split that causes it, the scoring model behind the grade, and a copy-paste check for your own endpoint. 2026-08-13
Why your x402 listing is stuck in 'processing' The validation crawl reads your live 402, not your settle call. The three preconditions in the order they bite, measured decay data, and a keepalive that costs $0.00 in steady state. 2026-08-13