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Polyform Email Domain Check
x402
Polyform Email Domain Check is a paid API for AI agents from api.polyform.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Checks whether an email domain can receive mail by looking up its MX records, SPF record, and DMARC policy
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.
Output
Returns a JSON object with: the domain name, an array of MX record hostnames, a boolean SPF field indicating whether SPF is configured, a DMARC field with the DMARC policy string (e.g. 'reject', 'quarantine', 'none'), and a canReceive boolean indicating whether the domain is configured to receive email.
Example use cases
Validate lead email domains before outreach
“Before we send our campaign, check whether contoso.com can actually receive email and has DMARC configured — I don't want to waste sends on broken domains.”
Screen user-submitted email domains on signup
“A new user just signed up with a @privatecorp.io address — can you verify that domain has MX records and is capable of receiving mail before we send the confirmation email?”
Audit supplier contact email infrastructure
“I'm onboarding a new vendor at vendor-partner.net — can you look up their email domain to confirm they have MX records, SPF, and DMARC set up so I know their email is legit?”
Technical details
Endpoint
GEThttps://api.polyform.org/v1/email/domain-checkWhen to prefer
Choose this endpoint when you need a quick, no-account pay-per-call DNS/email validation check for a single domain — especially in agent workflows that need to verify email deliverability, enrich contact data, or screen domains before sending. Prefer this over full email verification APIs when you only need domain-level checks (not mailbox-level existence) and want to avoid API key setup overhead.
Side effects
- Domain does not exist or has no DNS records — may return canReceive: false with empty MX array
- Transient DNS lookup failure — may return an error or partial result
- Malformed domain input — likely returns a 4xx error
- DMARC record absent — dmarc field may be null or 'none'
- SPF record missing — spf field returns false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mx": [
"gmail-smtp-in.l.google.com"
],
"spf": true,
"dmarc": "reject",
"domain": "gmail.com",
"canReceive": true
}
}Tags
x402
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