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Vextorium Subdomain Discovery via Certificate Transparency
x402
Vextorium Subdomain Discovery via Certificate Transparency is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).
Returns all subdomains of a given domain found in public Certificate Transparency logs, including subdomain names, wildcard count, and certificate dates.
Price / call$0.003
Success—
StatusUnknown
How this service works
Subdomains of a domain found in public Certificate Transparency logs (every TLS certificate issued): names, wildcard count and certificate dates. For asset inventory, audits and OSINT.
Output
Returns a JSON object containing the queried domain, a list of subdomain objects (each with name and latest certificate date), the total subdomain count, wildcard count, the date of the first certificate ever seen, the number of certificates analyzed, and the data source. May include a note field with additional context.
Example use cases
Attack surface mapping for pentest
“I'm doing a security assessment of acmecorp.com — can you pull all their subdomains from Certificate Transparency logs so I can map out their full attack surface? Show me up to 100 results.”
Forgotten subdomain audit
“We recently inherited the domain oldcompany.io and need to know every subdomain that's ever had a TLS certificate issued for it — fetch that list from CT logs so we can see what infrastructure might still be live.”
Competitor OSINT research
“I'm researching the infrastructure footprint of bigtech.com for competitive intelligence — can you enumerate all their subdomains visible in Certificate Transparency logs, including when the first and most recent certificates were issued?”
Technical details
Endpoint
POSThttps://api.vextorium.com/subdominios-pago?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need passive, non-intrusive subdomain discovery sourced from public Certificate Transparency logs without sending any traffic to the target domain. It is ideal for OSINT, asset inventory, and security audits where stealth or comprehensiveness of historical data matters. Prefer this over active DNS brute-forcing tools when you want a purely passive approach or need certificate issuance dates alongside subdomain names.
Side effects
- Domain not found in CT logs — returns empty subdomain list with zero counts
- Invalid or malformed domain input — likely returns an error or empty result
- Rate limiting — too many requests may result in errors
- Limit parameter ignored or capped at a server-side maximum
- Very new domains with no issued certificates return no results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limite | integer | |
| dominio | string |
Tags
x402
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