# MailFerret Email Verification

> MailFerret Email Verification is a paid API for AI agents from mailferret.appin60.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-22).

Verifies whether a given email address is deliverable using live SMTP checks, returning deliverability status, provider, and spam/catch-all signals

## Facts

- Endpoint: POST https://mailferret.appin60.com/verify?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mailferret-email-verification-d917f7c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yNsA6Tyb1QUKAQhRJMF1O

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 mailferret-email-verification-d917f7c4 -d '<json body>'
```

Example prompt: Can you verify whether zeno.rocha@resend.com is a real, deliverable work email — I need to know if it's valid, catch-all, or disposable before I send outreach?

## When to prefer this

Choose MailFerret when you need real-time, live SMTP verification of individual email addresses with no API key setup — ideal for pay-per-use agent workflows where you only pay on success. Prefer this over bulk verification services when checking one email at a time in an automated pipeline, or when you need detailed signals like catch-all, disposable, and role-account flags alongside deliverability status.

## Known failure modes

- Invalid or malformed email address returns an error or non-deliverable status
- SMTP timeout or temporary server unavailability may cause inconclusive results
- Catch-all servers may respond positively to any address, limiting accuracy
- Payment failure via x402/USDC may prevent the request from completing
- Rate limiting or network issues may cause intermittent failures

## How this service works

Email verification / email validation / bounce check before sending: verify one email address: syntax, MX records, mail provider (Google Workspace, Microsoft 365, ...), catch-all detection, role/free/disposable flags and a live SMTP RCPT check. Returns deliverable, undeliverable, catch_all or no_mx. Inconclusive results (greylisting) return 503 and are not charged.

## Output

Returns a JSON object with: deliverable (bool), status string (e.g. 'deliverable'), MX records array, email provider name (e.g. 'google_workspace'), catch_all (bool), disposable (bool), role_account (bool), and free_provider (bool). Charged $0.01 only on successful verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "email"
     ],
     "properties": {
      "email": {
       "type": "string",
       "minLength": 3,
       "description": "Email address to verify"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mx": [
   "aspmx.l.google.com"
  ],
  "email": "zeno.rocha@resend.com",
  "status": "deliverable",
  "provider": "google_workspace",
  "catch_all": false,
  "disposable": false,
  "deliverable": true,
  "role_account": false,
  "free_provider": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mailferret-email-verification-d917f7c4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mailferret.appin60.com](https://www.zero.xyz/host/mailferret.appin60.com/llms.txt)