validate-luhn
Luhn (mod 10) checksum validation, as used by most payment card numbers.
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 77 ms
- Price
- $0.002 per call
- Paying buyers, last 30 days
- 3 (directory's own records)
- Paid calls, last 30 days
- 3
- Category
- Payments and on-ramps
- Address
- https://x402.agentindex.world/validate/luhn
Accuracy
Accuracy scores are published once a seller has enough paid checks against an independent record (at least 7 scored answers over at least 7 days). Until then no score is shown, and a missing score is never a pass.
For agents
This page as JSON: /sellers/62b4e45947e6.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).