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Domain Preflight Check API
x402
Domain Preflight Check API is a paid API for AI agents from x402-canary.nicolas-x402-16f380a7.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Checks whether a given domain has MX and DNS records configured, returning a preflight readiness summary for coding agent workflows.
Price / call$0.02
Success—
StatusUnknown
How this service works
Free need-to-tool routing plus pay-per-call npm docs and TypeScript API signatures, npm breaking-change diffs, JavaScript-rendered browser snapshots and deterministic coding-agent checks via AgentCash/x402.
Output
Returns a JSON object with a `data` field containing `has_mx` (boolean indicating MX record presence) and `has_dns` (boolean indicating DNS record presence), plus a `meta` field with an `engine` key set to 'preflight'.
Example use cases
Email deliverability pre-check
“Before we try sending onboarding emails to users at acmecorp.io, can you check if that domain actually has MX records set up?”
Domain readiness validation in CI pipeline
“I'm setting up a new domain newstartup.dev — can you do a preflight DNS check to confirm the DNS and MX records are live yet?”
Bulk domain hygiene screening
“We have a lead list and I want to filter out domains that aren't properly DNS-configured — can you preflight check clientdomain.biz to see if it has valid DNS and MX records before we add them to our campaign?”
Technical details
Endpoint
POSThttps://x402-canary.nicolas-x402-16f380a7.workers.dev/v1/domain/preflightWhen to prefer
Use this endpoint when you need a quick, cheap ($0.02 USDC) binary check on whether a domain has MX and/or DNS records active — ideal for pre-validating email targets, filtering lead lists, or gating agent workflows on domain readiness before attempting communication. Prefer this over full DNS lookup services when you only need a simple yes/no preflight signal rather than detailed record contents.
Side effects
- Invalid or malformed domain string returns an error response
- Non-existent TLD may return false for both has_mx and has_dns
- Network timeout if DNS resolution is slow
- Missing `domain` field in request body may cause a 400 error
- Payment failure via x402 protocol blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"has_mx": true,
"has_dns": true
},
"meta": {
"engine": "preflight"
}
}
}Tags
x402
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