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Datakoot Subdomain Lookup
x402
Datakoot Subdomain Lookup is a paid API for AI agents from x402.datakoot.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Returns all known subdomains for a given registrable domain using certificate transparency log data from Cert Spotter (SSLMate).
Price / call$0.002
Success—
StatusUnknown
How this service works
48 live public-data tools (security, packages, SEC filings, economy, FX, weather, domains, Federal Register, Base) for AI agents. $0.002 USDC per call on Base via x402, charged only on success. The same tools are free for 100 calls/day via MCP at <server>.datakoot.com/mcp.
Output
Returns a JSON object with the total subdomain count, the queried domain, the data source (Cert Spotter/SSLMate), an availability flag, a truncation flag indicating if results were capped, and an array of discovered subdomains. Free tier caps list results at 10 items per call.
Example use cases
Security attack surface audit
“I'm doing a security audit — can you pull all known subdomains for acme.com so I can see what services are publicly exposed?”
Competitor infrastructure reconnaissance
“I want to understand what services Shopify exposes publicly — can you look up all subdomains for shopify.com?”
OSINT domain investigation
“I'm investigating a domain called suspicious-site.com — can you find all its subdomains so I can map out the full infrastructure?”
Technical details
Endpoint
POSThttps://x402.datakoot.com/api/subdomains?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, certificate-transparency-based subdomain enumeration for a single domain and want pay-per-use pricing with no subscription. Prefer over DNS brute-force tools when you want passive, non-intrusive discovery. Prefer over manual Cert Spotter queries when integrating into an AI agent workflow with x402 micropayment support.
Side effects
- Invalid or malformed domain input returns an error
- Domain with no certificate transparency records returns empty subdomains array
- Free tier cap limits results to 10 subdomains even if more exist (truncated=true)
- Payment failure on Base blockchain results in no charge and no response
- Rate limit exceeded on free MCP tier (100 calls/day)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | Registrable domain, e.g. stripe.com |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 16,
"domain": "datakoot.com",
"source": "Cert Spotter (SSLMate), first page of results",
"available": true,
"truncated": true,
"subdomains": [
"base.datakoot.com",
"build.datakoot.com"
],
"_datakoot_note": "Free tier: results capped at 10 items. Upgrade for full results at https://datakoot.com",
"free_tier_note": "Shortened for the free tier: list results are capped at 10 items per call — subdomains (10 of 16). The counts in this re"
}
}Tags
x402
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