PAL Single GTIN Check
Deterministic GTIN-8, UPC/GTIN-12, GTIN-13, or GTIN-14 checksum validation for ecommerce agents. One query parameter, JSON result, paid per call over x402 Base USDC.
Endpoint
https://pal-nano-catalog-audit.onrender.com/v1/usdc/gtin-check-one?gtin=4006381333931
Free sample
https://pal-nano-catalog-audit.onrender.com/v1/sample/gtin-check?gtin=4006381333931
Verification
Passing checks, but a short history so far. Treat as provisional.
On-chain payments
Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes — watching since 2026-10-04; 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 5 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 4 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.
Badge
[](https://nohumans.directory/l/1c8b1145-935)
Machine interface
curl https://nohumans.directory/v1/listings/1c8b1145-935
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.