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SiteCheck Certificate Transparency Lookup
x402
SiteCheck Certificate Transparency Lookup is a paid API for AI agents from api.healthtravel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Retrieves SSL/TLS certificate transparency records for a domain from crt.sh/Certspotter, returning certificate details including validity periods, DNS names, and SHA-256 hashes.
Price / call$0.002
Success—
StatusUnknown
How this service works
Certificate transparency records for a domain from the CertSpotter public CT index: certificate id, validity dates, revocation flag and the DNS names on each certificate (including subdomains). Shows issued certificates only, not live TLS configuration. crt.sh was unavailable during testing, so CertSpotter is used.
Output
Returns a JSON object with the queried domain, a count of certificates found, the Certspotter API source URL, a timestamp of when the check was performed, and an array of certificate records each containing: certificate ID, revocation status, list of DNS names covered, notBefore/notAfter validity dates, and the SHA-256 certificate fingerprint.
Example use cases
Detect unauthorized certificate issuance
“Check crt.sh for any SSL certificates issued for mybusiness.com — I want to see all of them, up to 50, to make sure no unauthorized certs have been issued for my domain.”
Subdomain discovery via CT logs
“Use certificate transparency logs to find all DNS names associated with certificates issued for stripe.com — show me up to 30 results so I can map out their subdomain footprint.”
Verify certificate fingerprint before deployment
“Look up the certificate transparency records for api.acmecorp.io and give me the SHA-256 fingerprint and expiry date for the most recent certificate — I need to confirm it matches what we deployed.”
Technical details
Endpoint
GEThttps://api.healthtravel-api.workers.dev/api/travel/crtsh-certificate-transparency?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to query certificate transparency logs for a specific domain without setting up an API key or account with Certspotter/crt.sh directly. Ideal for one-off or infrequent certificate lookups in agent workflows where pay-per-call is preferred over a subscription. Useful for security audits, subdomain enumeration via CT logs, and verifying certificate integrity. Prefer this over direct crt.sh web scraping when you need structured JSON output with consistent schema.
Side effects
- Invalid domain format returns an error (domain must use letters, digits, dots, hyphens only)
- limit parameter out of range (must be 1–50) may return an error or be clamped
- Domain not found in CT logs returns an empty certificates array with count 0
- Upstream Certspotter API unavailability causes a 5xx error; no charge on failed calls
- Rate limiting by upstream provider may result in delayed or empty responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 3,
"domain": "wikivoyage.org",
"source": "https://api.certspotter.com/v1/issuances",
"checkedAt": "2026-10-23T09:36:41.317Z",
"certificates": [
{
"id": "16313322805",
"revoked": false,
"dnsNames": [
"*.m.mediawiki.org",
"*.m.wikibooks.org"
],
"notAfter": "2026-11-03T19:15:40Z",
"notBefore": "2026-08-05T19:15:41Z",
"certSha256": "08e0b65df41fb075ec91c1dcd2cacc4e8c7dda53b754806525117b32f7b73253"
},
{
"id": "17388610453",
"revoked": false,
"dnsNames": [
"*.m.mediawiki.org",
"*.m.wikibooks.org"
],
"notAfter": "2026-12-23T14:37:36Z",
"notBefore": "2026-09-24T14:37:37Z",
"certSha256": "9908b07ed23df45f6bd5023880863a3d023db2a4748763defed536e3162a32d2"
}
]
}
}Tags
x402
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