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Email Syntax and MX Domain Validator
x402
Email Syntax and MX Domain Validator is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).
Validates an email address by checking its syntax and verifying the domain has valid MX DNS records, without sending any email.
Price / call$0.005
Success—
StatusDown
Output
Returns a validation result indicating whether the email address passes syntax checks and whether the domain has valid MX DNS records, without dispatching any email.
Example use cases
Example prompt
“Can you check if the email address john.doe@example.com is valid — both the format and whether the domain can actually receive mail — without sending anything to it?”
Technical details
Endpoint
POSThttps://api.x-402.online/v1/email/validateWhen to prefer
Use this endpoint when you need lightweight, passive email validation — checking both format and deliverability signals (MX records) without triggering any email send or requiring the user to click a link. Ideal for form validation, lead qualification, or pre-send list scrubbing where speed and privacy matter.
Side effects
- Malformed or missing email query parameter returns an error
- Domain exists but has no MX records — flagged as invalid for mail delivery
- Temporary DNS lookup failure may cause false negatives
- Extremely unusual but syntactically valid email formats may be misclassified
Tags
x402
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