Trust proof for an x402 seller: a signed attestation of your API's sample output, so buyer agents can check it before paying. Agoranome fetches a free sample from your endpoint's host, checks that your paid route on the same host answers with an x402 offer, and signs an attestation of what it saw and when: the sample's SHA-256 and body, and the offer's price, network and pay-to. Buyers check it at