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Contact Verify – SMTP-Level Email Verification
x402
Contact Verify – SMTP-Level Email Verification is a paid API for AI agents from verify-x402.okwithit9.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).
Performs real mailbox-level email verification including SMTP connectivity, catch-all detection, disposable address detection, and role account identification.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call email and phone verification for AI agents. Real mailbox-level email verification (SMTP-level deliverability, catch-all, disposable, and role detection). Live carrier line-type lookup (mobile, landline, VoIP, toll-free) with E.164 normalization. No signup and no API key. Payment is USDC on Base via x402 exact. Email addresses and phone numbers are not stored. Paid routes return HTTP 402 until the client sends a valid x402 PAYMENT-SIGNATURE. USDC uses 6 decimals.
Output
A JSON object containing the verified email address and domain, deliverability status ('safe', etc.), username, MX records, SMTP connectivity result, and boolean flags for: is_deliverable, is_catch_all, is_disposable, is_role_account, is_free_email, is_disabled, is_spamtrap, has_inbox_full, is_safe_to_send, mx_accepts_mail, can_connect_smtp, is_valid_syntax, plus an overall_score numeric confidence (0–100).
Example use cases
Pre-send list hygiene check
“Before I send this campaign, can you check whether user@companyname.com is actually deliverable and not a disposable or catch-all address? I want the full SMTP-level result.”
Sign-up fraud prevention
“Someone just signed up with the email temp12345@mailinator.com — can you verify whether it's a real mailbox or a disposable throwaway address?”
Sales outreach email validation
“I'm about to cold-email info@prospect.io — can you check if that's a real deliverable address, and tell me if it's a role account or catch-all before I reach out?”
Technical details
Endpoint
POSThttps://verify-x402.okwithit9.workers.dev/verify/email?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real SMTP-level mailbox verification rather than syntax-only validation. It is ideal for pre-send list hygiene, fraud prevention at sign-up, or sales outreach qualification where you need catch-all, disposable, and role-account detection with a numeric confidence score. Prefer it over simple regex or DNS-only validators when deliverability certainty matters.
Side effects
- Invalid email syntax returns an error before payment is charged
- SMTP timeout or unreachable mail server may result in inconclusive deliverability status
- Catch-all servers mask per-mailbox existence, flagged via is_catch_all
- Rate limiting or payment failure results in 402 response
- Non-existent domain returns mx_accepts_mail: false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"email": "ada@example.com",
"domain": "example.com",
"status": "safe",
"username": "ada",
"mx_records": [
"mx.example.com"
],
"is_disabled": false,
"is_spamtrap": false,
"is_catch_all": false,
"is_disposable": false,
"is_free_email": false,
"overall_score": 98,
"has_inbox_full": false,
"is_deliverable": true,
"is_role_account": false,
"is_safe_to_send": true,
"is_valid_syntax": true,
"mx_accepts_mail": true,
"can_connect_smtp": true
}
}Tags
x402
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