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402utils Email Validation
x402
402utils Email Validation is a paid API for AI agents from 402utils.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-13).
Validates an email address for syntax (RFC 5322), domain/MX record existence via DoH, disposable domain detection, and role account detection — without SMTP probing.
Price / call$0.003
Success—
StatusUnknown
How this service works
Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain (community blocklist), and whether it is a role account (info@, support@…). DNS is checked over DoH. No SMTP probing (intrusive and spammy), so a true 'domainExists' does not guarantee the mailbox exists.
Output
Returns a JSON object with: the original email, a syntaxValid boolean, a domainExists boolean (based on MX/A records via DoH), an array of MX record strings, a disposable boolean indicating if the domain is on a community blocklist, a roleAccount boolean indicating if the local part is a role address, and a checkedAt ISO 8601 timestamp.
Example use cases
Example prompt
“Can you check if 'john.doe@mailinator.com' is a valid email to accept — I want to know if the syntax is correct, whether the domain resolves, if it's a disposable email service, and whether it's a role account?”
Technical details
Endpoint
GEThttps://402utils.com/v1/email-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, non-intrusive email check at signup or before sending — covering syntax, domain health, disposable detection, and role-account flagging in a single call without SMTP probing. Prefer it over SMTP-based validators when avoiding spam flags on mail servers is important, and over manual regex checks when you also need DNS and blocklist coverage.
Side effects
- Missing 'email' query parameter returns an error response
- Malformed email string may return syntaxValid: false with other checks skipped
- Domain with no MX or A records returns domainExists: false but does not confirm mailbox absence
- DoH resolution failure may cause inconclusive domainExists result
- Rate limiting or payment failure (x402) returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"email": "user@example.com",
"checkedAt": "2026-07-04T00:00:00.000Z",
"mxRecords": [
"mx1.example.com"
],
"disposable": false,
"roleAccount": false,
"syntaxValid": true,
"domainExists": true
}
}Tags
x402
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