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Email Verification & MX Validation API
x402
Email Verification & MX Validation API is a paid API for AI agents from x402-datashop-production.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Validates an email address via RFC 5322 syntax check and live MX record lookup, returning a deliverability verdict (deliverable, risky, or undeliverable) with DNS details.
Price / call$0.005
Success—
StatusUnknown
How this service works
One-call email verification for lead qualification and list hygiene: RFC 5322 syntax check, then a live MX lookup over DNS-over-HTTPS (Cloudflare, Google fallback). Detects non-existent domains (NXDOMAIN), null-MX domains that refuse mail (RFC 7505), and returns prioritized MX hosts. Query: ?email=someone@example.com. Verdict: deliverable | risky | undeliverable. 1h cache per address.
Output
Returns a verdict of 'deliverable', 'risky', or 'undeliverable', along with prioritized MX host records, NXDOMAIN detection, null-MX (RFC 7505) flag, and syntax validity. Results are cached per address for 1 hour.
Example use cases
Example prompt
“Can you check whether john.smith@acmecorp.io is a real, deliverable email address — run the full syntax and MX lookup and tell me if it's deliverable, risky, or undeliverable?”
Technical details
Endpoint
GEThttps://x402-datashop-production.up.railway.app/v1/validate/emailWhen to prefer
Use this endpoint when you need a fast, single-call email validation that goes beyond syntax checking to confirm actual DNS-level deliverability — ideal for lead qualification, sign-up form validation, or list hygiene where you want to detect NXDOMAIN domains and null-MX domains without running your own DNS infrastructure.
Side effects
- Email address missing or malformed query parameter returns an error
- Domain has no MX records but is not NXDOMAIN — classified as risky
- DNS-over-HTTPS upstream failure may cause lookup errors
- Addresses over 254 characters are rejected
- Temporary DNS timeouts may return inconclusive results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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