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agent402.tools Email Validator
x402
agent402.tools Email Validator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates an email address by checking syntax correctness and performing a live MX record DNS lookup on the domain to assess deliverability.
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate an email address: syntax check plus live MX record lookup on the domain (deliverability signal, not a guarantee).
Output
Returns a validation result indicating whether the email passes syntax checks and whether the domain has valid MX records, providing a deliverability signal (not a delivery guarantee).
Example use cases
Example prompt
“Can you check whether 'john.doe@example.com' is a valid email address — look at the syntax and verify the domain actually has mail servers set up?”
Technical details
Endpoint
POSThttps://agent402.tools/api/email-validateWhen to prefer
Use this endpoint when you need a quick, lightweight email validation that goes beyond simple regex — specifically when you want to confirm a domain can actually receive mail via MX record lookup. Prefer this over pure client-side regex validation when deliverability assurance matters, and over full send-based verification when you don't want to send a real email.
Side effects
- DNS timeout causing MX lookup to fail or return inconclusive result
- Malformed input (non-string or missing email field) returning a 400 error
- Domain exists but has no MX records, returning a negative deliverability signal
- Network issues causing the live DNS lookup to be unavailable
- Payment failure due to insufficient USDC balance returning a 402 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Email address to check |
Output
Schema · Response
{
"type": "json",
"example": {
"email": "someone@gmail.com",
"domain": "gmail.com",
"mxRecords": [
"gmail-smtp-in.l.google.com",
"alt1.gmail-smtp-in.l.google.com"
],
"syntaxValid": true,
"deliverableDomain": true
}
}Tags
x402
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