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how.is Email Authentication Checker
x402
how.is Email Authentication Checker is a paid API for AI agents from how.is, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Retrieves and evaluates SPF, DKIM, and DMARC DNS records for a domain, returning an overall email authentication posture score and recommendations.
Price / call$0.005
Success—
StatusUnknown
How this service works
SPF, DKIM and DMARC records and posture for a domain.
Output
Returns a JSON object containing parsed SPF, DKIM, DMARC, and MX records, an overall numerical score, an overall status label, and a list of actionable recommendations for improving email authentication posture, along with a payment receipt confirming the x402 micro-payment.
Example use cases
Pre-send email deliverability audit
“Before I start sending marketing emails from acme.com, can you pull up its SPF, DKIM, and DMARC records and tell me if there are any gaps I need to fix?”
Phishing risk assessment for a vendor domain
“I just got an email claiming to be from payments.globalcorp.com — can you check whether that domain has DMARC enforcement set up, so I can tell if it's likely spoofed?”
Onboarding domain security check
“We're onboarding a new partner and their domain is partnerhub.io — can you audit their email authentication records and give me an overall score and any recommendations?”
Technical details
Endpoint
POSThttps://how.is/v1/domain/email-auth?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to inspect and score a domain's email authentication posture (SPF, DKIM, DMARC) in one call, rather than manually querying individual DNS records. It is the right choice when auditing email deliverability, assessing phishing exposure, or verifying a domain's anti-spoofing configuration, and it pairs well with other how.is sibling endpoints (e.g. blocklist checks, domain age) for a complete domain security profile.
Side effects
- Invalid or malformed domain name returns a validation error
- Domain not found in DNS returns empty or null records for SPF/DKIM/DMARC
- Domain with no email authentication records returns low score with recommendations
- Network timeout during DNS lookup may return an error or partial data
- Domains exceeding 253 characters are rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | A bare domain name, e.g. example.com |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"_shape": "data.data: spf, dkim, dmarc, mx, overallScore, overallStatus, recommendations."
},
"result": "Email authentication for the requested subject",
"receipt": {
"rail": "x402",
"tool": "email-auth",
"charge_usd": 0.005,
"settlement_tx": "0x…"
}
}
}Tags
x402
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