# Rotary Agency Mail Check API

> 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

## Facts

- Endpoint: GET https://rotaryagency.uk/api/free/mailcheck?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rotary-agency-mail-check-api-27256d20
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__a5GO-NwylaOdfjAwLdPY

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability rotary-agency-mail-check-api-27256d20
```

Example prompt: Can you check whether the email address john.doe@example.com is valid and actually deliverable before I add it to my mailing list?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "varies": "endpoint-specific structured JSON"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rotary-agency-mail-check-api-27256d20/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rotaryagency.uk](https://www.zero.xyz/host/rotaryagency.uk/llms.txt)