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SiteCheck SSL Certificate Transparency Lookup
x402
SiteCheck SSL Certificate Transparency Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).
Retrieves SSL/TLS certificate issuances for a domain from Certificate Transparency logs, including current certificates, subdomains, and expiry info
Price / call$0.002
Success—
StatusUnknown
How this service works
Current TLS certificates for a domain from Certificate Transparency logs (via CertSpotter): issuer, validity dates and days left, DNS names (up to 100 per certificate), and the distinct subdomains seen. Keyless tier: one request per call; answers are cached an hour.
Output
Returns a JSON object containing the domain queried, a list of current active certificates (each with issuer, DNS names covered, notBefore, notAfter, and daysLeft), a full list of discovered subdomains, total issuance count, the data source attribution (CertSpotter), and a checkedAt timestamp.
Example use cases
Subdomain discovery via cert logs
“Use certificate transparency logs to find all subdomains that have ever had a TLS cert issued for acmecorp.com — I want a full list of what's out there.”
Certificate expiry monitoring
“Check the SSL certificates for mycompany.com and tell me if any are expiring in the next 30 days so I can renew them before they lapse.”
Rogue certificate detection
“Look up all SSL certificates issued for ourbrand.com in the certificate transparency logs — I want to know if any were issued by a certificate authority we don't normally use, which could indicate a security issue.”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/certs?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to audit SSL/TLS certificate history and coverage for a domain, discover subdomains via CT logs (a passive recon technique), check certificate expiry dates, or detect unexpected/rogue certificates issued by unauthorized CAs. Prefer this over DNS enumeration tools when you want certificate-sourced subdomain discovery without active scanning.
Side effects
- Invalid or non-existent domain returns an error or empty result
- Domain with no certificate transparency entries returns empty issuances array
- CertSpotter API upstream unavailability may cause timeout or error
- Rate limiting on upstream CT log provider may delay response
- Truncated subdomain list if domain has very large number of issuances
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"domain": "cloudflare.com",
"source": "https://api.certspotter.com/v1/issuances (Certificate Transparency logs)",
"current": [
{
"issuer": "SSL.com",
"daysLeft": 136,
"dnsNames": [
"staging.cp12.cloudflare.com"
],
"notAfter": "2027-02-27T18:53:54Z",
"notBefore": "2026-02-27T18:53:54Z"
},
{
"issuer": "SSL.com",
"daysLeft": 136,
"dnsNames": [
"cp12.cloudflare.com"
],
"notAfter": "2027-02-27T18:53:58Z",
"notBefore": "2026-02-27T18:53:58Z"
},
{
"issuer": "SSL.com",
"daysLeft": 126,
"dnsNames": [
"time.cloudflare.com",
"www.time.cloudflare.com"
],
"notAfter": "2027-02-17T21:30:57Z",
"notBefore": "2026-02-17T21:30:57Z"
}
],
"checkedAt": "2026-10-14T07:00:57.376Z",
"issuances": 100,
"subdomains": [
"accounts-test.staging.realtime.cloudflare.com",
"accounts.staging.realtime.cloudflare.com",
"ai.cloudflare.com"
],
"attribution": "Certificate Transparency logs via CertSpotter"
}
}Tags
x402
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