api.x-402.online
Check whether a domain is reachable and healthy: DNS, certificate, redirects, security headers. One call on a domain: A, AAAA, NS, MX and SPF records; the TLS certificate with issuer, expiry and days left; the HTTP redirect chain hop by hop
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 121 ms
- Price
- $0.005 per call
- Paying buyers, last 30 days
- 3 (directory's own records)
- Paid calls, last 30 days
- 3
- Category
- DNS and domains
- Address
- https://api.x-402.online/v1/domain/health
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/86b3504eec00.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).