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x402 Email Validation API
x402
x402 Email Validation API is a paid API for AI agents from agentkit-x402.zenith-ops.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Validates an email address by checking syntax, DNS/MX records, disposable/role status, typo detection, and deliverability risk scoring — paid per-call in USDC via x402
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call API for AI agents with no signup or API key. Email validation, SPF/DMARC audits, DNS lookup, site contacts, URL to Markdown, IBAN and Swedish personnummer/orgnr validation. From $0.001 in USDC on Base via x402.
Output
Returns a JSON object with: overall deliverability score (0-100), verdict (safe/risky/invalid), syntax validity flag, MX records for the domain, null_mx and nxdomain flags, disposable and role_account booleans, free_provider flag, smtp_checked flag, typo_suggestion if the domain looks misspelled, and an array of reason codes explaining the verdict (e.g. 'possible_domain_typo').
Example use cases
Lead list email hygiene
“Before we import this list of signups, check if john.doe@mailnator.com is valid — flag it if it's disposable, a role account, or has a suspicious domain.”
Form submission fraud detection
“A user just signed up with support@tempmail.org — can you tell me if that's a real email or a throwaway address I should reject?”
CRM data quality audit
“We have the email ceo@gmial.com in our CRM — is the domain a typo, and does it actually have mail servers set up? Give me a risk verdict.”
Technical details
Endpoint
GEThttps://agentkit-x402.zenith-ops.workers.dev/v1/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, no-signup, pay-per-call email validation that combines syntax checking, DNS/MX verification, disposable detection, and typo suggestion in one call. Ideal for AI agents that need to validate emails on-demand without managing API keys or subscriptions. Prefer over heavier email verification services when you want USDC micropayment billing and don't need live SMTP probing.
Side effects
- Missing 'email' query parameter returns an error
- Malformed email input may return syntax_valid: false with no DNS data
- DNS lookup failures may result in incomplete MX data
- Temporary DNS timeouts may affect score accuracy
- No SMTP connection is made, so a syntactically valid email with valid MX can still have an undeliverable mailbox — the API notes this limitation explicitly
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"dns": {
"mx": [
{
"host": "mail.gmial.com",
"priority": 10
}
],
"null_mx": false,
"nxdomain": false,
"address_record": true
},
"note": "Based on syntax, lists and DNS only. No SMTP connection is made, so a deliverable mailbox is not confirmed.",
"email": "anna@gmial.com",
"score": 70,
"domain": "gmial.com",
"reasons": [
"possible_domain_typo"
],
"verdict": "risky",
"disposable": false,
"local_part": "anna",
"role_account": false,
"smtp_checked": false,
"syntax_valid": true,
"free_provider": false,
"typo_suggestion": "gmail.com"
}
}Tags
x402
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