# Mat Web & Data Toolkit – Email Check

> Mat Web & Data Toolkit – Email Check is a paid API for AI agents from automatom.matt-d59.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Validates an email address by checking its syntax, MX records, domain deliverability, and whether it belongs to a free email provider.

## Facts

- Endpoint: GET https://automatom.matt-d59.workers.dev/emailcheck?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mat-web-data-toolkit-email-check-0052b840
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JL-4wWuaHe7MEgVdJZNc3

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 mat-web-data-toolkit-email-check-0052b840
```

Example prompt: Can you check if info@example.com is a valid, deliverable email address — tell me if the syntax is correct, whether there are MX records, and if it's from a free email provider?

## When to prefer this

Use this endpoint when you need a lightweight, real-time email validation that goes beyond syntax checking — specifically when you need MX record lookups and free-provider detection in a single call. Prefer it over pure regex validation when deliverability certainty matters, such as before sending transactional emails or qualifying leads.

## Known failure modes

- Missing or malformed email query parameter returns an error
- Domains with no public DNS records may return has_mx: false and deliverable_domain: false even if valid
- Rate limiting or upstream DNS timeouts may cause delayed or failed lookups
- Temporary DNS outages for a domain could cause false negatives on deliverability

## How this service works

Fetches a public web page and returns its title, meta description, outbound links and readable plain text as JSON.

## Output

Returns a JSON object containing: the original email and extracted domain, a syntax_valid boolean, a has_mx boolean with the full list of MX exchange records and their priorities, fallback A records, a free_provider boolean indicating whether the domain belongs to a common free email provider (e.g. Gmail, Yahoo), and a deliverable_domain boolean.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "email"
     ],
     "properties": {
      "email": {
       "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": [
   {
    "exchange": "",
    "priority": 0
   }
  ],
  "email": "info@example.com",
  "domain": "example.com",
  "has_mx": true,
  "fallback_a": [],
  "syntax_valid": true,
  "free_provider": false,
  "deliverable_domain": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mat-web-data-toolkit-email-check-0052b840/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from automatom.matt-d59.workers.dev](https://www.zero.xyz/host/automatom.matt-d59.workers.dev/llms.txt)