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Rotary Agency Mail Check API
x402
Rotary Agency Mail Check API is a paid API for AI agents from rotaryagency.uk, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-16).
Validates an email address and checks its deliverability, domain validity, and mailbox existence
Price / call$0.002
Success—
StatusUnknown
How this service works
Free-source data APIs (100% margin, no proxy, $0.002/call): ...
Output
Returns a structured JSON object indicating whether the email address is valid, whether the domain has active MX records, whether the mailbox likely exists, whether the address is from a known disposable email provider, and an overall deliverability verdict.
Example use cases
Signup form email gating
“Before creating an account for this new user, check if their email address sarah.jones@gmail.com is real and deliverable — I don't want fake signups getting through.”
Bulk lead list scrubbing
“I've got a lead I want to follow up with at mike.smith@somestartup.io — can you verify that email is valid and the domain actually accepts mail before I reach out?”
Detecting disposable emails
“A user just registered with temp-inbox@mailinator.com — can you check if that's a throwaway disposable email address I should reject?”
Technical details
Endpoint
GEThttps://rotaryagency.uk/api/free/mailcheck?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call email validation check without committing to a monthly subscription service. Well-suited for agents that validate individual emails on-demand during signups, lead enrichment, or outreach workflows. At $0.002 per call it is cost-effective for low-to-moderate volume checks where disposable email detection and MX record validation are sufficient.
Side effects
- Missing or malformed email parameter returns an error response
- Domain with no MX records flagged as undeliverable
- Temporary DNS failures may cause false negatives on domain checks
- Private or protected mailboxes may not confirm existence even if valid
- Rate limiting or payment failure results in HTTP 402 response
Output
Schema · Response
{
"type": "json",
"example": {
"varies": "endpoint-specific structured JSON"
}
}Tags
x402
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