# Email Syntax and Domain Structure Validator

> Email Syntax and Domain Structure 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 whether an email address has valid syntax and domain formatting without sending email or verifying mailbox existence.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/demand-domain-email-structure-check-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/email-syntax-and-domain-structure-validator-cbc9377c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__GE0TSJ5m16CG8j3Y2kn6

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-syntax-and-domain-structure-validator-cbc9377c -d '<json body>'
```

Example prompt: Can you check if 'jane.doe@example-company.com' has valid email syntax and proper domain formatting — just the structure, not whether the inbox actually exists?

## When to prefer this

Choose this endpoint when you need a fast, lightweight check that an email string is structurally valid before storing it, sending to it, or passing it to another system — and you do not need to confirm deliverability or mailbox existence. Ideal for form validation, data pipeline quality gates, and pre-filtering obviously malformed addresses at low cost ($0.01/call).

## Known failure modes

- Malformed or missing email field in request body returns a validation error
- Completely absent input may result in a 400 bad request
- Edge-case international or Unicode email addresses may produce unexpected results
- Does not detect disposable or temporary email providers
- Cannot confirm whether the domain actually accepts mail

## How this service works

Email structure check for Email operations: 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 structural analysis of the email address indicating whether the syntax (local part, @ symbol, domain) is correctly formed and whether the domain portion follows valid formatting rules. Does not confirm mailbox existence or perform DNS MX record lookups to verify deliverability.

## 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-syntax-and-domain-structure-validator-cbc9377c/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)