# Email Quick Syntax & Disposable Check

> Email Quick Syntax & Disposable Check is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-11-01).

Offline email validation: RFC syntax check, disposable-domain flag (~9,900 domains), role address and free-mail flags — no DNS or MX lookup, fastest possible check.

## Facts

- Endpoint: GET https://freetier-agent-api.pages.dev/api/email-verify-quick?utm_source=zero.xyz
- Price: $0.0025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-quick-syntax-disposable-check-36002080
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UUWVxzNJlSQlIM7aDlDKP

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-quick-syntax-disposable-check-36002080
```

Example prompt: Can you quickly check if info@mailinator.com is a valid email — is it disposable, a role address, or from a free-mail provider? Just a fast offline check, no DNS needed.

## When to prefer this

Choose this endpoint when you need the fastest possible email check and do not require DNS or MX record verification. It is ideal for real-time signup validation, bulk lead list screening, or any scenario where latency matters and offline heuristics (syntax, disposable domain list, role/free-mail flags) are sufficient. Use the sibling email-verify endpoint instead when deliverability confirmation via MX lookup is required.

## Known failure modes

- Missing email query parameter returns an error
- Malformed or missing input schema results in 400-level response
- Disposable domain list may not cover newly created throwaway domains
- No MX/DNS check means deliverability is not confirmed — use email-verify endpoint for that
- Free-mail flag coverage depends on built-in list completeness

## How this service works

Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.

## Output

Returns a JSON object with: email (echoed back), syntax_ok (boolean), disposable (boolean, based on ~9,900 known disposable domains), role (boolean indicating role-based address like info@ or support@), and verdict (string such as 'risky' or 'ok') — all determined offline without DNS or MX lookups.

## 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"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "role": true,
  "email": "info@mailinator.com",
  "verdict": "risky",
  "syntax_ok": true,
  "disposable": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-quick-syntax-disposable-check-36002080/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from freetier-agent-api.pages.dev](https://www.zero.xyz/host/freetier-agent-api.pages.dev/llms.txt)