# toolcall.click Email Validate

> toolcall.click Email Validate is a paid API for AI agents from toolcall.click, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).

Checks an email address for syntax validity, MX record existence, disposable-domain status, role-account and free-provider flags, and returns a deliverability risk verdict without sending any email.

## Facts

- Endpoint: GET https://toolcall.click/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/toolcall-click-email-validate-4108f597
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PTF8bH9eJRR0EjkxlBOsp

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 toolcall-click-email-validate-4108f597
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — flag if it's disposable, a role account, or has no valid MX records?

## When to prefer this

Use this endpoint when you need a lightweight, no-send email validation that covers syntax, DNS/MX infrastructure, and social signals (disposable, role, free-provider) in a single call. Prefer it over full email ping/SMTP verification when you cannot send test messages, need instant results at signup, or want to avoid SMTP-based rate limits and blocklisting. Ideal for signup fraud prevention, list hygiene before campaigns, and lead qualification pipelines.

## Known failure modes

- Missing 'email' query parameter returns an error response
- Malformed email string may still pass syntax check depending on permissiveness
- Unknown or newly created disposable domains may not yet appear in the blocklist
- Private or unusual TLDs may cause MX lookup failures unrelated to deliverability
- Network timeouts on DNS lookups could cause delayed or failed responses

## 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 verdict with a bounce/risk level, plus individual flags: syntax valid/invalid, MX record found/not found, whether the domain is in the 121k+ disposable-domain blocklist, whether it's a role account (e.g. info@, support@), 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/toolcall-click-email-validate-4108f597/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toolcall.click](https://www.zero.xyz/host/toolcall.click/llms.txt)