risk data for machine payments
Endpoint
x402.payperbyte.io/feeds/merchant-screen
Know-Your-Agent (KYA) counterparty screening — merchant pillar. Pre-settlement merchant screen: signed ALLOW/WARN/BLOCK on a (domain, payTo, observed price) BEFORE an agent settles an x402 payment. ms-v1 ruleset over first-party signals measured at query time — RDAP domain age, live TLS handshake (cert age, issuer, SAN match), off-domain redirect probe, brand-similarity distance vs a committed known-brand corpus, and the merchant's own advertised x402 manifest price. Method disclosed per field; unmeasurable signals report unverified and only lower confidence. The verdict carries an embedded EIP-712 PayloadAttestation — recompute keccak256(answer) and recover the signer before acting. Trust boundary: the payTo and price are values you assert, not values we observe on your payment — the verdict is a point-in-time snapshot of the exact tuple you supplied, and it neither sees nor constrains the address you ultimately settle to. Before releasing funds compare answer.query against the 402 challenge you are about to pay (answer.query.address is lowercased — compare case-insensitively). The receipt proves provenance and integrity, not correctness. Every query is logged and retained: the domain, the payTo address and price you supplied, the verdict, and a summary of the signals behind it. Producing a verdict requires live outbound requests against the screened domain itself — the merchant may observe this traffic; screening is not covert.
Score
The score is built from observations we collect ourselves: how the endpoint responds, what the envelope contains, how stable the price and the recipient are, who pays and how often. It is deterministic — the same input always produces the same result.
We do not publish the exact methodology yet. If you own this endpoint, write to us and we will show you, item by item, what drags the score down.
Recent probes
| When | Code | Latency | Scheme and network | Recipient | Price | Findings |
|---|---|---|---|---|---|---|
| 3h ago | 402 | 162 ms | exact eip155:8453 |
0xffFf…E0DB | 0.100000 | clean |
| 10h ago | 402 | 400 ms | exact eip155:8453 |
0xffFf…E0DB | 0.100000 | clean |
| 4d ago | 402 | 374 ms | exact eip155:8453 |
0xffFf…E0DB | 0.100000 | clean |
| 4d ago | 402 | 344 ms | exact eip155:8453 |
0xffFf…E0DB | 0.100000 | clean |
Reference
| URL | https://x402.payperbyte.io/feeds/merchant-screen |
| Sources | bazaar well-known |
| Recipient per catalogue | 0xffFf4B8Da8C165B556326453446F6940C8AFE0DB |
| Price per catalogue | NaN |
| Machine access | /v1/endpoint · /full · badge |
Is this your endpoint?
The score is built only from public observations. If something we recorded is wrong — say our prober hit you during maintenance — write to us. We will recheck and publish your reply next to the score.
We do not delete accurate observations. The prober makes at most one request per second per host and only asks for the payment challenge — it never pays and never takes content.