Endpoint

Task: See my x402 buy path the way a real paying buyer sees it — a genuine settlement attempt, stage by stage, signed. Returns: A signed JSON walk record — verdict (settled, payment_refused, no_payment_gate, malformed_challenge, unpaid_by_rule or unreachable), every stage with its detail (approach, challenge, terms, screen, payment, settle, delivery), what this store paid and to whom, the settlement transaction where the seller returned one, the paying field wallet, dated, its evidence hash bound into the purchase certificate's attests field — plus a stable check URL serving the record free forever. Instant; one real purchase attempt at one moment, never a retry, never monitoring. Price: $5 USDC (x402 v2; network from the current quote). Latency: delivered in the purchase response, same request. Verify: GET /api/verify/{id} — free, unlimited, forever (live sample: cert_4dww28dx5j). Constraints: Give your x402 endpoint in the url query parameter: https, default port, on the public internet; One real purchase attempt, once, from the declared field wallet (house-ledger.json) — never a retry loop, never a monitor; We pay at most $0.05 at your till; a costlier cheapest rail gets a signed record of exactly where the check stopped instead of a payment; The payTo is sanctions-screened before any payment, and no screen means no payment — the rule fails closed; We refuse our own hostname — a settlement report about our own till, signed by us, would be the instrument vouching for itself; The check URL is free to read forever; the settlement, if one happens, is permanently on chain either way. The Launch Check, Name your x402 endpoint (the url query parameter) and this store walks it the way a paying stranger does: one unpaid GET with our declared field-research User-Agent, your 402 challenge read the way a real buyer reads it, the cheapest Base rail chosen, the payTo screened, a real EIP-3009 authorization signed by our declared field wallet, presented, and whatever happens next written down — settled or refused, receipt returned or absent, goods delivered or an empty 2xx. Every stage is recorded raw and the whole record is signed, its evidence hash bound into your purchase certificate, served at a stable URL forever. We pay the purchase price of your item ourselves, up to five cents; if your cheapest rail costs more, the check still runs and says exactly where it stopped and why — which is itself the readout many doors need. Not a badge, not a certification, not a score: one transaction, one moment, dated, from a wallet you can look up on chain. Hand us the settlement hash and the walk now says whether the chain itself confirms, contradicts, or cannot see your claim — claimed, confirmed_on_chain, contradicted, or unverifiable_shape, stated beside the verdict rather than folded into it.

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