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DomainRef - Domain and Email Security Check
x402
DomainRef - Domain and Email Security Check is a paid API for AI agents from domainref.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Returns a graded security report for a domain covering SPF, DKIM, DMARC, MX, MTA-STS, DNSSEC, CAA, TLS, domain age, BIMI, and blocklist status with exact fix records.
Price / call$0.01
Success—
StatusUnknown
How this service works
Use when mail lands in spam, before an email campaign, for vendor due diligence or to confirm a Microsoft 365 tenant: graded SPF, DKIM, DMARC, MX, MTA-STS, DNSSEC, CAA, TLS and domain age, plus BIMI and blocklist info, each with the exact fix record. Non-intrusive. $0.01 per domain.
Output
A JSON object containing a numeric score (0–100), a letter grade (A–F), and an array of individual security checks. Each check includes the check name (e.g. 'dmarc'), a pass/fail/warn grade, a human-readable finding, and an exact fix record where remediation is needed.
Example use cases
Pre-campaign email deliverability audit
“Before I send out our newsletter campaign tomorrow, can you check email security on ourdomain.com — I need to know if SPF, DKIM, and DMARC are all set up properly and whether we're on any blocklists?”
Vendor due diligence security review
“I'm about to onboard a new supplier at supplierco.com — can you check their domain's email security grade and flag any missing or misconfigured records like DMARC, DNSSEC, or MTA-STS?”
Diagnosing email landing in spam
“Our emails from techstartup.io keep landing in recipients' spam folders — can you audit our domain's email security and show me exactly what DNS records need to be fixed?”
Technical details
Endpoint
GEThttps://domainref.dev/v1/domain/check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, graded, non-intrusive audit of a domain's email authentication and DNS security posture in a single call. It is especially useful pre-campaign, for spam troubleshooting, vendor due diligence, or Microsoft 365 tenant validation — where you need actionable fix records rather than raw DNS lookups. Prefer it over manual DNS lookup tools or generic WHOIS services when you want a structured score and remediation guidance.
Side effects
- Invalid or non-existent domain returns an error or empty result
- DNS timeout may cause incomplete check results
- Newly registered domains may have incomplete DNS propagation affecting results
- Punycode or internationalized domain names may not be handled correctly
- Rate limiting or payment failure returns a 402 or 429 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"score": 100,
"checks": [
{
"fix": null,
"check": "dmarc",
"grade": "pass",
"finding": "DMARC enforces p=reject on 100% of mail."
}
],
"domain": "example.com",
"letter": "A"
}
}Tags
x402
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