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Subdomain Finder via Certificate Transparency
x402
Subdomain Finder via Certificate Transparency is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns all subdomains of a given domain discovered in public TLS certificate transparency logs (crt.sh), deduplicated and sorted, up to 500 results.
Price / call$0.01
Success—
StatusUnknown
How this service works
Subdomain finder from certificate-transparency logs: every hostname under a domain that has appeared in public TLS certificates (crt.sh), deduplicated and sorted, up to 500. Attack-surface mapping, asset discovery and competitor research. $0.01 per domain.
Output
A deduplicated, sorted list of up to 500 hostnames (subdomains) that have appeared in public TLS certificate transparency logs for the given domain, sourced from crt.sh.
Example use cases
Attack surface mapping for pentest
“I'm doing a security assessment on acme.com — can you enumerate all the subdomains that have appeared in public TLS certificates so I can map out their attack surface?”
Competitor infrastructure research
“Pull all subdomains you can find for shopify.com from certificate transparency logs — I want to understand what infrastructure and services they've exposed publicly.”
Forgotten asset discovery
“Can you look up all subdomains for our domain mybrand.io using certificate logs? We think there might be old staging or dev environments still exposed that we've forgotten about.”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/subdomainsWhen to prefer
Choose this endpoint when you need passive, non-intrusive subdomain enumeration based purely on public certificate transparency logs. It is ideal for OSINT, asset discovery, and attack-surface mapping without sending any traffic to the target. Prefer it over active DNS brute-force tools when stealth or legality is a concern, or when you need a quick, cheap ($0.01) snapshot of a domain's publicly known subdomains.
Side effects
- Domain not found or never issued a TLS certificate returns an empty list
- Malformed domain input may return an error
- Rate limiting or payment failure returns a 402 response
- Results capped at 500 entries; very large domains may be truncated
- Wildcard certificate entries (e.g. *.example.com) may appear in results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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