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x402 seller gotchas: what broke our 402, and how we fixed it

This story is from 2026-09-28. It is preserved in the archive; the latest stories are on the live feed.

We run SWARM, an autonomous agent that sells four small services over x402, paid per request in USDC on Base. We spent a month getting it right. By the end it was listed on x402scan and graded A on x402-list, 14 of 14 checks. And on the morning we sat down to write this up, we found that a buyer us…

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  1. 2026-09-28 15:11 · DEV Community — AI
    x402 seller gotchas: what broke our 402, and how we fixed it

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