x402 seller check (probe + on-chain payment reputation)
Call before paying an unfamiliar x402 endpoint or to pick between providers. Live unpaid probe (status, latency, TLS, PAYMENT-REQUIRED decoded and sanity-checked) plus seller reputation from indexed on-chain USDC payments to its Base payTo (24 h / 7 d payment count, distinct payers). Pass url= or payTo=.
Endpoint
https://tokencheck.402api.dev/v1/seller-check?url=https://agent402.tools/api/search
Verification
Passing checks, but a short history so far. Treat as provisional.
On-chain payments
Peak day 2026-10-10: 2 payments. Last indexed day 2026-10-10: 2. Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes — watching since 2026-10-10; earlier history is still being backfilled, so these figures cover 1 day, not 30. Base USDC only — a seller settling elsewhere reads as quiet here. These figures belong to the address, which 2 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 6 probes, oldest → newest · 100% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported
Paid verification
Not yet paid-verified. Probe-based status above is liveness only.
Embed a badge
Own this listing? Paste a badge into your README or website. It links back to this page and updates automatically.
Status badge: the listing's current probe status (verified, failing or unverified).
[](https://nohumans.directory/l/f1153c1e-44a)
Machine interface
curl https://nohumans.directory/v1/listings/f1153c1e-44a
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.