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MailCheck API: Email and Domain Checks
x402
MailCheck API: Email and Domain Checks is a paid API for AI agents from mailcheck.toolschemaforge.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Validates email addresses by checking syntax, MX records, disposable/role/free flags, typo suggestions, and SPF/DMARC/DKIM authentication, returning a deliverability grade and verdict.
Price / call$0.001
Success—
StatusUnknown
How this service works
Email address and domain checks for AI agents: syntax, MX, disposable/role/free flags, typo suggestions, SPF/DMARC/DKIM, RDAP and a deliverability grade. Pay per item with x402 (USDC on Base) or Lightning sats. No signup.
Output
Returns a JSON object with a results array; each item includes the normalized email, local and domain parts, syntax validity, MX record details (status, records, source), flags (disposable, role account, free provider, plus tag), a 0–100 deliverability score, a verdict (valid/risky/invalid/disposable/unknown), a list of reasons, a canonical form, and a typo suggestion if applicable. Also includes a summary count by verdict category.
Example use cases
Block fake signups at registration
“Before we create an account for the email address 'user@mailinator.com', can you check if it's a disposable or role-based address, validate the syntax, and tell me the deliverability verdict so we can decide whether to block it?”
Fix typo in lead capture form
“A lead submitted 'sarah.jones@gmai.com' on our contact form — can you check if that looks like a typo and suggest the correct email address, along with whether it has working MX records?”
Audit a batch of subscriber emails
“I have a list of email addresses — 'alice@example.com, bob@trashmail.com, carol@company.org' — can you validate each one, flag any disposable or risky ones, and give me a score and verdict for each?”
Technical details
Endpoint
GEThttps://mailcheck.toolschemaforge.workers.dev/v1/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, per-item email validation that goes beyond simple regex — including MX/DNS checks, disposable address detection, typo correction, deliverability scoring, and SPF/DMARC/DKIM checks — with no API key or signup required and pay-per-call pricing via USDC or Lightning.
Side effects
- Missing email or emails query parameter returns an error
- Invalid or malformed email input may return syntax_valid: false with a reason code
- DNS lookup failures for MX records result in mx.status: error or skipped
- Payment not included or insufficient results in HTTP 402 payment required
- Rate limiting or quota exceeded may return HTTP 429
- Non-existent domain returns mx.status: nxdomain
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 1,
"results": [
{
"mx": {
"source": "dns",
"status": "ok",
"records": [
{
"exchange": "mx.example-parking.net",
"priority": 10
}
]
},
"email": "jane.doe@gmial.com",
"flags": {
"plus_tag": false,
"disposable": false,
"role_account": false,
"free_provider": false
},
"input": "jane.doe@gmial.com",
"local": "jane.doe",
"score": 60,
"domain": "gmial.com",
"reasons": [
"possible typo: did you mean gmail.com?"
],
"verdict": "risky",
"canonical": "jane.doe@gmial.com",
"suggestion": "gmail.com",
"syntax_valid": true
}
],
"summary": {
"risky": 1,
"valid": 0,
"invalid": 0,
"unknown": 0,
"disposable": 0
}
}
}Tags
x402
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