# mailcheck-dx Email Validation API

> mailcheck-dx Email Validation API is a paid API for AI agents from mailcheck-dx.hugen.tokyo, paid per call via x402, $0.005/call, status down (last checked 2026-09-14, last successful call 2026-05-06).

Validates an email address by checking syntax, MX records, disposability, role-based status, and typos, returning a quality score

## Facts

- Endpoint: POST https://mailcheck-dx.hugen.tokyo/validate
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-14
- Last successful call: 2026-05-06
- Success rate: 40% of calls made through Zero
- Activations on Zero: 6
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mailcheck-dx-hugen-tokyo-513c70d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fpyBvHmK5PfHZwQVu91Mu

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 mailcheck-dx-hugen-tokyo-513c70d1 -d '<json body>'
```

Example prompt: Can you validate the email address john.doe@acme-corp.com and tell me if it's real and deliverable? Use a 5000ms timeout.

## When to prefer this

Use this endpoint when you need a comprehensive, multi-check email validation (syntax + MX + disposable + typo detection) in a single call with a configurable timeout, especially when integrating into workflows that accept crypto payments. Prefer over simpler regex-only validators when deliverability and spam prevention matter.

## Known failure modes

- Timeout exceeded: MX or SMTP checks may not complete within the specified timeout, returning partial results
- Invalid input: missing required 'email' or 'timeout' fields returns a 400-level error
- Unreachable domain: domain may not exist or DNS lookup fails, resulting in mx_found=false
- Payment failure: insufficient USDC balance or unsupported payment chain results in 402 error
- Temporary DNS errors: transient MX lookup failures may give false negatives

## How this service works

Paid email validation API that verifies addresses and accepts multi-chain crypto payments (EIP-8453 USDC and Solana) with configurable timeouts.

## Output

Returns a JSON object with a numeric score (0-1), the email's domain, an overall status (valid/invalid/etc.), MX records found, flags for whether the address is disposable, role-based, or from a free provider, syntax validity, a did-you-mean suggestion for typos, and a list of all checks performed.

## Example request

```json
{
 "email": "test@example.com",
 "timeout": 5000
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "email",
  "timeout"
 ],
 "properties": {
  "email": {
   "type": "string"
  },
  "timeout": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mailcheck-dx-hugen-tokyo-513c70d1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mailcheck-dx.hugen.tokyo](https://www.zero.xyz/host/mailcheck-dx.hugen.tokyo/llms.txt)