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Certificate Transparency Log Lookup
x402
Certificate Transparency Log Lookup is a paid API for AI agents from netintel-production-440c.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-09).
Queries crt.sh certificate transparency logs to enumerate all SSL certificates issued for a domain, returning subdomains, issuers, validity periods, and a risk score.
Price / call$0.01
Success—
StatusUnknown
How this service works
Query the crt.sh certificate transparency log database to enumerate all SSL certificates ever issued for a domain — returns subdomains discovered, certificate issuers, validity periods, and a risk score flagging wildcard certs, expiring certs, and suspicious issuance patterns.
Output
Returns a list of certificates with issuer details and validity periods, an array of unique subdomains discovered, wildcard certificates, recently issued certificates, certificates expiring within 30 days, a numeric risk score, a letter grade, and findings describing suspicious or notable patterns.
Example use cases
Example prompt
“Look up all SSL certificates ever issued for example.com in the certificate transparency logs — include subdomains, flag any wildcard certs or ones expiring within 30 days, and give me a risk score.”
Technical details
Endpoint
GEThttps://netintel-production-440c.up.railway.app/cert-transparency/lookup?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need passive, read-only reconnaissance on a domain's SSL certificate history without touching the target — ideal for subdomain discovery, security audits, certificate expiry monitoring, or detecting unauthorized certificate issuances. Prefer over active port scanners when stealth and non-intrusiveness matter.
Side effects
- Invalid or malformed domain name returns validation error
- Domain with no certificates in crt.sh returns empty results with zero count
- Limit exceeding 500 returns error or is clamped
- crt.sh upstream unavailability causes timeout or 502 error
- Rate limiting may occur for high-frequency queries
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"certs": [
{
"id": 12345678,
"sans": [
"example.com",
"www.example.com"
],
"issuer": "Let's Encrypt",
"not_after": "2024-04-01T00:00:00Z",
"is_expired": false,
"not_before": "2024-01-01T00:00:00Z",
"common_name": "example.com",
"is_wildcard": false,
"days_until_expiry": 90
}
],
"grade": "A",
"score": 100,
"domain": "example.com",
"issuers": [
"Let's Encrypt"
],
"findings": [],
"wildcard_certs": [],
"recently_issued": [],
"total_certs_found": 47,
"unique_subdomains": [
"www.example.com",
"mail.example.com"
],
"unique_subdomain_count": 2,
"expiring_within_30_days": []
}
}Tags
x402
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