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SSL Certificate Transparency Lookup API
x402
SSL Certificate Transparency Lookup API is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-30).
Retrieves SSL/TLS certificate information for a given domain from public Certificate Transparency logs, including validity, expiry, issuer, and DNS coverage details.
Price / call$0.005
Success—
StatusUnknown
How this service works
Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.
Output
Returns a JSON object containing a list of valid certificates from CT logs for the queried domain (newest first), each with issuer name, SHA256 fingerprint, days remaining, DNS names covered, and validity window (not_before/not_after). Also includes summary fields: has_valid_cert (boolean), valid_count, newest_days_left, expiring_within_14d flag, list of unique issuers, data sources used, and the timestamp when the check was performed.
Example use cases
Pre-launch SSL certificate audit
“Before we go live, can you check that api.mycompany.com has a valid SSL certificate and that it's not expiring within the next two weeks?”
Security vendor certificate verification
“I need to verify the SSL cert for payments.vendor.com — who issued it, what domains it covers, and when does it expire?”
Monitoring competitor certificate changes
“Look up the SSL certificate for shopify.com and tell me the SHA256 fingerprint, issuer, and exact expiry date so I can track if it changes.”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/ssl-cert?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically verify SSL/TLS certificate status for a domain without standing up your own CT log integration. It is ideal for agents performing security audits, pre-deployment checks, or monitoring certificate expiry, especially when you want structured JSON output including fingerprint, issuer, DNS coverage, and days-to-expiry in a single call. Prefer this over raw TLS handshake checks when you need historical CT log data rather than the live certificate a server presents.
Side effects
- Domain not found in CT logs — returns empty certs array with has_valid_cert: false
- Invalid or malformed domain input — may return error or empty result
- Domain has no currently valid certificates — valid_count returns 0
- CT log source (SSLMate) temporarily unavailable — request may timeout or return partial data
- Payment failure via x402 — request rejected before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Certificates logged in public Certificate Transparency logs that cover this exact name and are valid now (newest first). The certificate a given server prese...",
"certs": [
{
"issuer": "SSL.com",
"sha256": "85ca6ab068e9bcce88b6c4aa3c47f7d17228134a457f870d3800e6223a0df07a",
"days_left": 61,
"dns_names": [
"*.example.com",
"example.com"
],
"not_after": "2026-12-25T22:56:35Z",
"not_before": "2026-09-26T22:49:11Z",
"dns_names_total": 2
},
{
"issuer": "SSL.com",
"sha256": "8355fddfbed74907fff8ad99b4844c3f3a4644261e6f339a12f9f38d56b19502",
"days_left": 61,
"dns_names": [
"*.example.com",
"example.com"
],
"not_after": "2026-12-25T22:56:35Z",
"not_before": "2026-09-26T22:48:57Z",
"dns_names_total": 2
}
],
"domain": "example.com",
"newest": {
"issuer": "SSL.com",
"sha256": "85ca6ab068e9bcce88b6c4aa3c47f7d17228134a457f870d3800e6223a0df07a",
"days_left": 61,
"dns_names": [
"*.example.com",
"example.com"
],
"not_after": "2026-12-25T22:56:35Z",
"not_before": "2026-09-26T22:49:11Z",
"dns_names_total": 2
},
"issuers": [
"SSL.com",
"Sectigo"
],
"sources": [
{
"url": "https://sslmate.com/ct_search_api/",
"name": "SSLMate Cert Spotter CT API"
}
],
"checked_at": "2026-10-25T22:37:38.437Z",
"valid_count": 13,
"has_valid_cert": true,
"newest_days_left": 61,
"expiring_within_14d": false
}
}Tags
x402
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