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Email Deliverability Check
x402
Email Deliverability Check is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Checks whether an email address or domain is deliverable by validating MX records, address format, and disposable/temporary email status
Price / call$0.002
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
Returns a JSON object with three boolean fields: 'mx' indicating whether the domain has valid MX records, 'valid' indicating whether the email address format is valid, and 'disposable' indicating whether the email comes from a known disposable/temporary email provider.
Example use cases
Screen sign-up emails for fake accounts
“Before we accept this new user registration, can you check if the email they signed up with — tempuser@mailinator.com — is valid, has MX records, and is from a disposable email service?”
Validate leads before email outreach
“I have a lead with the email contact@acmecorp.io — can you verify it's deliverable and not a throwaway address before we add it to our outreach campaign?”
Debug why emails are bouncing
“We're getting bounces from orders@shopexample.net — can you check if that domain even has MX records set up and whether the email address is structurally valid?”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/email-deliverability?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call email deliverability check with no account setup required. Ideal for agents that need to validate user-submitted emails at sign-up, screen leads before outreach, or detect throwaway addresses — especially in workflows where sporadic, low-volume checks make a subscription service impractical. Best suited for quick boolean-flag checks rather than deep SMTP handshake verification.
Side effects
- Missing or malformed email/domain input may return an error or empty result
- Unknown or newly created disposable domains may not be flagged as disposable
- DNS lookup failures may cause mx field to return false even for valid domains
- Rate limits or network timeouts may result in failed payment with no response
- Private or internal domains may return false negatives for MX checks
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mx": true,
"valid": true,
"disposable": true
}
}Tags
x402
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