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Coinslot Email Verifier
x402
Coinslot Email Verifier is a paid API for AI agents from coinslot.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Validates one or more email addresses by checking RFC syntax, live MX DNS records via DNS-over-HTTPS, and disposable-domain screening
Price / call$0.003
Success—
StatusUnknown
How this service works
Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and disposable-domain screening. POST { email } or { emails: [...] } (max 20).
Output
For each submitted email address, the endpoint returns whether it passes RFC syntax validation, whether the domain has live MX records (checked via DNS-over-HTTPS), and whether the domain is flagged as a disposable/throwaway provider. Responses indicate overall validity status plus the individual check results.
Example use cases
Pre-signup email gating
“Before letting this user register, check if their email address temp-user@mailinator.com is real and not a throwaway — I want to block disposable addresses at signup.”
Bulk lead list hygiene
“I have a list of 15 email addresses from our lead form — can you validate all of them at once and tell me which ones have valid MX records and which are from disposable domains?”
CRM data quality audit
“I need to verify that the contact email on this record — sarah.jones@bizco.io — actually has a working mail server and passes proper RFC syntax before we launch our email campaign.”
Technical details
Endpoint
POSThttps://coinslot.dev/api/email-verifyWhen to prefer
Choose this endpoint when you need a lightweight, multi-layer email check (syntax + live DNS MX + disposable screening) without spinning up a full email deliverability service. Ideal for pre-signup gating, CRM hygiene, or lead list scrubbing where you need instant, low-cost validation of up to 20 addresses per call. Not intended for SMTP-level handshake verification or catch-all domain detection.
Side effects
- Invalid JSON body or missing both email and emails fields
- emails array exceeds 20 items — returns 400 error
- Malformed email input that can't be parsed
- DNS-over-HTTPS lookup timeout causing MX check to be inconclusive
- Disposable domain list may not cover every provider, leading to missed detections
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Single address | |
| emails | array |
Tags
x402
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