# Email Address Validator

> Email Address Validator is a paid API for AI agents from toolsmith-api.dassad10.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).

Validates an email address for syntax, MX records, disposable domain, role account, and free provider status, returning a deliverability risk verdict

## Facts

- Endpoint: GET https://toolsmith-api.dassad10.workers.dev/t/email/validate
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-address-validator-63fa62a7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZrGkWQByNhZXupK2H4EsW

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 email-address-validator-63fa62a7
```

Example prompt: Can you validate the email address j.smith@mailinator.com and tell me if it's deliverable, whether the domain is disposable, and if it's a role account or free provider?

## When to prefer this

Use this endpoint when you need a fast, non-intrusive technical check on an email address without sending any message — ideal for signup form validation, lead quality scoring, fraud screening, or pre-send list hygiene. Prefer this over send-based verification when you cannot or should not send a real email. Its 121k+ disposable domain database makes it especially strong for catching throwaway addresses.

## Known failure modes

- Missing email query parameter returns an error
- Malformed email string may still be processed with a syntax-fail verdict
- Unknown or very new disposable domains may not be in the 121k database and could be missed
- Network timeouts on MX record lookups for obscure domains
- Non-existent TLDs may cause DNS lookup failures

## How this service works

Email verification and deliverability check without sending anything: syntax, MX records, disposable-domain detection (121k+ known domains), role-account and free-provider flags. JSON verdict with a bounce/deliverability risk level. Validate emails for signup fraud prevention, list hygiene and lead qualification. $0.004 USDC per call, pay via x402, no API key.

## Output

A JSON object containing a deliverability risk level and boolean flags for: syntax validity, MX record existence, whether the domain is disposable (checked against 121k+ known domains), whether it's a role account (e.g. admin@, noreply@), and whether it belongs to a free email provider.

## 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",
       "description": "Email address to validate"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "risk": "high",
  "role": false,
  "email": "user@example.com",
  "hasMx": false,
  "reasons": [
   "no_mx"
  ],
  "disposable": false,
  "syntaxValid": true,
  "freeProvider": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-address-validator-63fa62a7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toolsmith-api.dassad10.workers.dev](https://www.zero.xyz/host/toolsmith-api.dassad10.workers.dev/llms.txt)