# Domain Format Check for Email Operations

> Domain Format Check for Email Operations is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Validates that a hostname has correct public-domain syntax and normalizes internationalized domain names (IDNs); uses DNS data only and does not send email or verify inbox existence.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/demand-domain-domain-format-email-operations?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/domain-format-check-for-email-operations-de42032c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_55WuoI1jFNn3sxJ7t19SP

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 domain-format-check-for-email-operations-de42032c -d '<json body>'
```

Example prompt: Can you check whether 'bücher.example.de' is a valid public domain format and give me its normalized form?

## When to prefer this

Choose this endpoint when you need to validate that a domain string is syntactically correct as a public domain and/or normalize an IDN to its ASCII-compatible encoding (Punycode) — especially as a lightweight pre-flight check before attempting email delivery or storing domain data. Do not use this if you need to verify that a specific inbox or mailbox exists, check MX records, or actually send an email.

## Known failure modes

- Invalid or malformed domain string returns a syntax error or invalid flag
- Private/reserved domains (e.g. localhost, .local, .internal) may be flagged as non-public
- Extremely long domain labels or TLDs may fail length validation
- Network or service unavailability returns a 402 or 5xx error
- Empty or missing domain field returns a validation error

## How this service works

Domain format check for Email operations: Check a hostname for valid public-domain syntax and normalize IDNs. DNS data only; does not send email or verify that an inbox exists.

## Output

Returns whether the provided hostname passes valid public-domain syntax rules and, for internationalized domain names (IDNs), the normalized (ACE/Punycode) form. Does not perform inbox verification or send any email — DNS-level format checking only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "default": "example.com",
   "description": "Public DNS domain, e.g. example.com."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/domain-format-check-for-email-operations-de42032c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)