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PreFlight Checker – Domain Liveness & DNS Audit
x402
PreFlight Checker – Domain Liveness & DNS Audit is a paid API for AI agents from x402-api-catalog.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Checks whether a domain is live by resolving its DNS records (A, MX, NS, TXT), verifying mail routing, and testing HTTP reachability.
Price / call$0.02
Success—
StatusUnknown
How this service works
Domain liveness check / verify / audit: DNS resolution (A/MX/NS/TXT records), whether mail routing exists, HTTP reachability.
Output
Returns a verdict object with the domain name and liveness status, along with DNS resolution details (A, MX, NS, TXT records), mail routing existence, and HTTP reachability — summarized into an overall pass/fail verdict.
Example use cases
Email campaign pre-send validation
“Before I send a bulk email campaign to these leads, can you verify that each recipient domain has valid MX records and is actually live? Start with leads.example.com.”
New vendor domain due diligence
“I'm about to onboard a vendor who gave me the domain startupco.io — can you check if it resolves, has proper DNS records, and is reachable over HTTP so I know they're legit?”
Domain purchase research
“I'm considering buying the domain quietmountain.com — can you check whether it currently resolves, what DNS records exist on it, and if there's any mail routing configured?”
Technical details
Endpoint
GEThttps://x402-api-catalog.onrender.com/api/domain-checkWhen to prefer
Choose this endpoint when you need a quick, comprehensive liveness audit of a domain covering DNS (A/MX/NS/TXT), mail routing, and HTTP reachability in a single call. Prefer it over individual DNS lookup tools when you want a consolidated verdict rather than raw record data, or when evaluating domain health for email deliverability, vendor vetting, or domain acquisition research.
Side effects
- Domain does not exist (NXDOMAIN) — returns negative verdict with no DNS records
- Domain resolves but HTTP endpoint is unreachable — partial result with DNS data but HTTP failure
- Invalid or malformed domain input — request rejected with validation error
- Upstream DNS resolver timeout — may return partial or empty results
- Rate limiting or payment failure — request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"domain": "example.com",
"verdict": "fully live",
"httpReachable": true,
"hasMailRouting": true,
"hasWebPresence": true
}
}Tags
x402
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