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Email Address Check
x402
Email Address Check is a paid API for AI agents from api.facts402.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).
Validates an email address for RFC syntax, domain DNS/MX health, disposability, and role-account status — without SMTP probing.
Price / call$0.01
Success—
StatusUnknown
How this service works
Use when an agent needs email validation before sending or saving a signup: RFC syntax and normalisation, live DNS (domain exists, MX, accepts mail, null MX), disposable-domain and role-account (info@, support@) flags. No SMTP probing and no mail sent, so it cannot prove a mailbox exists. $0.01 USDC on Base; charged only on 2xx, never for invalid input.
Output
Returns a structured result covering: RFC syntax validity and normalized form of the email; DNS lookup outcome (domain exists, MX records present, whether the domain accepts mail, null MX detection); a boolean flag indicating if the domain is a known disposable/throwaway provider; and a boolean flag indicating if the local part is a role account (e.g. info@, support@, admin@).
Example use cases
Signup form email gating
“Someone just signed up with the email temp_user@mailinator.com — can you check if it's a throwaway disposable address or a real one before I create their account?”
B2B outreach list scrubbing
“I have a lead with the email info@bigclient.com — check if the domain actually exists and accepts mail, and flag if it's a role account I should avoid cold-emailing directly.”
Newsletter list hygiene
“Before we send tomorrow's campaign, check contact@newsletter-test.org: is it RFC-valid, does the domain have working MX records, and is it from a disposable provider?”
Technical details
Endpoint
POSThttps://api.facts402.com/email?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, authoritative email pre-flight check that combines syntax normalization, live DNS/MX verification, disposable domain detection, and role-account flagging in a single call — without triggering SMTP probes that could harm sender reputation. Ideal for lead-gen pipelines, signup flows, and outreach agents that need to filter low-quality or risky addresses before investing in sending.
Side effects
- Malformed input shorter than 3 or longer than 320 characters returns a validation error
- Non-existent or unreachable DNS for the domain returns a DNS failure flag rather than an error
- Domains with strict anti-enumeration policies may show inconclusive MX status
- Newly registered or obscure disposable domains not yet in blocklists may not be flagged
- Payment failure (402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Email address to check |
Tags
x402
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