# mailcheck.hugen.tokyo MX Record Lookup

> mailcheck.hugen.tokyo MX Record Lookup is a paid API for AI agents from mailcheck.hugen.tokyo, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).

Performs MX record DNS lookup for a domain and returns mail server hostnames sorted by priority, indicating whether mail delivery is possible.

## Facts

- Endpoint: GET https://mailcheck.hugen.tokyo/mx
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mailcheck-hugen-tokyo-aa437e18
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tViU5oZg0DifnBRvtmbKH

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-hugen-tokyo-aa437e18
```

Example prompt: Can you look up the MX records for acmecorp.io and tell me if it has any mail servers set up, along with their hostnames and priorities?

## When to prefer this

Use this endpoint when you need to quickly check whether a domain has mail servers configured, without setting up a local DNS library or resolver. Ideal for email deliverability pre-checks, validating whether a domain can receive email, or enriching contact/lead data with mail infrastructure details. Pairs well with the full email validation endpoint when you only need the MX component specifically.

## Known failure modes

- Domain does not exist or has no MX records — returns empty list or negative existence flag
- Invalid domain format — may return error or empty result
- DNS timeout or resolution failure — service-level error response
- Unsupported TLD or malformed input — returns error
- Payment not received or insufficient — x402 payment required error

## How this service works

MX record lookup for any domain — returns whether mail servers exist and their hostnames sorted by priority. Verify email deliverability before sending. Supports all TLDs including ccTLDs and new gTLDs. No DNS library setup needed. Accepts USDC payments on Base and Solana

## Output

Returns a list of MX records for the queried domain, each with a mail server hostname and priority value, plus a boolean indicating whether mail servers exist at all.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mailcheck-hugen-tokyo-aa437e18/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mailcheck.hugen.tokyo](https://www.zero.xyz/host/mailcheck.hugen.tokyo/llms.txt)