# Email Structure & Domain Format Validator

> Email Structure & Domain Format Validator 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).

Checks an email address for valid syntax and domain formatting using DNS data, without sending email or verifying mailbox existence.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/demand-domain-email-structure-check-security-review?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/email-structure-domain-format-validator-23c6194c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cA-t25EASiC1nD2oxmWgM

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-structure-domain-format-validator-23c6194c -d '<json body>'
```

Example prompt: Can you check if 'john.doe@company-example.co.uk' has valid email syntax and a properly formatted domain? I just need a structural check, no need to actually ping the mailbox.

## When to prefer this

Choose this endpoint when you need a fast, lightweight check of email syntax and domain format — for example, before storing user input, during security review of suspicious submissions, or for data-quality passes on imported contact lists. Prefer it over full mailbox-verification services when you do not want to send email or trigger SMTP probes, and when DNS-level domain format validation is sufficient.

## Known failure modes

- Malformed or missing email input returns a validation error
- Non-existent or unreachable DNS domain may cause a lookup failure
- Edge-case email formats (e.g. quoted local parts, internationalized domains) may yield unexpected results
- Payment failure or insufficient funds returns an HTTP 402 error
- Overly long email strings may be rejected

## How this service works

Email structure check for Security review: Check syntax and domain formatting only; it does not test whether a mailbox exists. DNS data only; does not send email or verify that an inbox exists.

## Output

Returns a structured result indicating whether the email address passes syntax and domain format checks. Includes whether the local-part and domain are correctly structured per email standards, and DNS-based domain formatting data. Does not confirm mailbox existence or send any email.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "default": "user@example.com",
   "description": "Email address to inspect."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-structure-domain-format-validator-23c6194c/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)