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Vextorium Subdomain Lookup
x402
Vextorium Subdomain Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-28).
Discovers subdomains and wildcard entries for a given domain using Certificate Transparency logs via SSLMate CertSpotter
Price / call$0.003
Success—
StatusUnknown
How this service works
558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.
Output
A JSON object containing the queried domain, total number of subdomains found, a list of subdomain objects with their names and last certificate dates, the date of the first certificate ever seen, the number of certificates analyzed, wildcard count, and the data source (Certificate Transparency via SSLMate CertSpotter), plus a note about API history limits.
Example use cases
Security audit of company attack surface
“What subdomains exist for acme-corp.com? I'm doing a security audit and want to see everything exposed via certificate transparency logs.”
Competitor infrastructure reconnaissance
“Can you enumerate all the subdomains of competitor.io using SSL certificate records so I can understand how their infrastructure is organized?”
Verifying subdomain coverage before launch
“We're about to launch — can you check what subdomains are already registered under myapp.com and when their certificates were issued, so I know what's already out there?”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/subdomains?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to discover subdomains passively using certificate transparency logs without active DNS scanning. It's ideal for OSINT, security auditing, and infrastructure reconnaissance where you want historical SSL certificate data. Prefer this over active DNS enumeration tools when stealth or a read-only approach is required.
Side effects
- Domain not found in certificate transparency logs — returns empty subdomains array
- Invalid domain format — may return error or empty result
- Rate limiting or payment failure — request rejected before processing
- Domain has no SSL certificates — returns zero results
- Limit parameter too large — may be silently capped
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | integer | |
| domain | string |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Only recent valid certificates; the free API limits history.",
"total": 2,
"domain": "vextorium.com",
"source": "Certificate Transparency via SSLMate CertSpotter",
"wildcards": 1,
"subdomains": [
{
"name": "*.vextorium.com",
"last_certificate": "2026-10-02T00:00:00Z"
},
{
"name": "vextorium.com",
"last_certificate": "2026-10-02T00:00:00Z"
}
],
"first_certificate": "2026-09-27T12:11:54Z",
"analyzed_certificates": 4
}
}Tags
x402
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