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x402 Email Verification API
x402
x402 Email Verification API is a paid API for AI agents from call402.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-19).
Validates an email address by checking syntax, disposable domain lists, and MX DNS records, returning a deliverability verdict
Price / call$0.005
Success—
StatusUnknown
How this service works
USDC pay-per-call APIs for AI agents via the x402 protocol (v2, exact, Base mainnet). Send a request, receive HTTP 402 with payment requirements, pay with @x402/fetch or any x402 client, retry with the PAYMENT-SIGNATURE header.
Output
Returns a JSON object with the original email and domain, a verdict field (e.g. 'likely_deliverable'), booleans for format_valid, mx_found, and disposable, a list of discovered MX hosts, and metadata describing which checks were performed (syntax, disposable list, MX lookup). No SMTP mailbox probing is performed.
Example use cases
Signup form email gating
“Before I add this lead to my CRM, can you verify that john.doe@gmail.com is a real deliverable email and not a throwaway address?”
Bulk list pre-send cleanup
“I'm about to send a campaign — check if marketing-contact@startupxyz.io is a valid email with working MX records so I don't waste sends on dead addresses.”
Fraud screening for new accounts
“A new user just signed up with temp-user@guerrillamail.com — can you tell me if that's a disposable or fake email I should flag?”
Technical details
Endpoint
POSThttps://call402.com/api/email-verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-use email validation that covers syntax, disposable domain detection, and MX record lookup without SMTP probing. It is ideal for agents that need occasional or low-volume email checks without committing to a subscription-based validation SaaS. The x402 USDC micropayment model makes it cost-effective at $0.005 per call for sporadic validation needs.
Side effects
- Missing or malformed email field returns a 400-level error
- Invalid JSON body causes request rejection
- Payment not included or invalid causes HTTP 402 response with payment requirements before processing
- Domain with no MX records returns mx_found: false and a conservative verdict
- Disposable domains are flagged but not blocked — verdict interpretation is left to the caller
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Email address to validate |
Output
Schema · Response
{
"type": "json",
"example": {
"meta": {
"note": "No SMTP mailbox probing.",
"checks": [
"syntax",
"disposable_list",
"mx_lookup"
]
},
"email": "someone@example.com",
"domain": "example.com",
"verdict": "likely_deliverable",
"mx_found": true,
"mx_hosts": [
"mail.example.com"
],
"disposable": false,
"format_valid": true
}
}Tags
x402
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