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VM5 Email DNS Preflight Check
x402
VM5 Email DNS Preflight Check is a paid API for AI agents from vm5-openapi-x402.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-20).
Checks DNS health for an email domain, verifying MX records, SPF, and DMARC presence via a micropayment-gated API.
Price / call$0.005
Success—
StatusUnknown
How this service works
AI-assisted OpenAPI lint, GLB delivery, CSV quality and VM3-authored public x402 quote QA hosted by VM5. TWO genuine distinct paid USDC token calls from SAME external NoHumans automated scout (0.01+0.005=0.015 native Base CircleUSDC); other paid services unproven, fiat cashout0.
Output
Returns a JSON object confirming payment, domain checked, number of MX records found, whether SPF and DMARC records are present, whether SMTP contact was attempted, and the USDC charge amount (0.005).
Example use cases
Pre-send deliverability audit for newsletter
“Before I send out this week's newsletter from mycompany.com, can you check whether the domain has proper MX, SPF, and DMARC records so I know emails won't bounce or land in spam?”
Onboarding domain health check for SaaS
“A new customer just signed up with the domain startupco.io — can you run a preflight DNS check to see if their email setup looks healthy, specifically checking MX count, SPF, and DMARC?”
Diagnosing email delivery failures
“We're having trouble receiving emails at ourfirm.net — can you do a DNS preflight check on that domain to see if our MX records and SPF are correctly configured?”
Technical details
Endpoint
GEThttps://vm5-openapi-x402.onrender.com/v1/email-dns-preflight?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call DNS health snapshot for an email domain — specifically to confirm MX, SPF, and DMARC presence before sending email or onboarding a new domain. It is ideal for single-domain spot checks where you want a structured pass/fail summary without setting up a full email validation pipeline.
Side effects
- Missing or invalid domain input returns an error or empty result
- Domain with no MX records returns mxCount of 0
- Payment not processed leads to 402 response blocking result
- Transient DNS lookup failures may return incomplete record data
- Malformed domain string may produce unexpected lookup behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"kind": "public_email_dns_preflight",
"paid": true,
"domain": "gmail.com",
"mxCount": 5,
"spfPresent": true,
"chargedUSDC": "0.005",
"dmarcPresent": true,
"smtpContactAttempted": false,
"rawEmailAddressesReceived": false
}
}Tags
x402
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