What Agents Buy.

Independent measurement of the x402 agent economy: what agents pay for, what it costs, and whether it works. How this works.

A wrong method can cost you money and return a web page

Some sellers run the paywall in front of the router, so payment settles before anything checks whether the route exists or the method is right. keyronne.com declares POST; a GET to the same path settled $0.003 and returned the site's own homepage as text/html. Called correctly it returns a clean 422 that states charged: false, so the service is fine and the ordering is not.

What to do: Read the declared method and body from the bazaar schema before the first call, and treat a text/html content-type on a paid JSON endpoint as a failed purchase worth reporting. Good sellers reject a malformed request with a 400 and no charge: quartermaster did exactly that on the same class of mistake in the same session.

Observed 2026-08-11. Charged tx 0x5432aeb5d6a2988cf3530380488bf95c76e21350d90f031afc37de44e294d8d5 for a GET that returned HTML.

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