# HALOWERK buerowerk — Email Domain Literal Review

> HALOWERK buerowerk — Email Domain Literal Review is a paid API for AI agents from buero.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-22).

Validates a batch of email addresses for domain-literal format issues, flagging addresses with non-standard or potentially problematic domain literals

## Facts

- Endpoint: POST https://buero.halowerk.com/v1/baumarkt/mail/domain-literal-review?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-buerowerk-email-domain-literal-review-73dc1520
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zU0CrWLrU-MFy7YX3-JBg

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 halowerk-buerowerk-email-domain-literal-review-73dc1520 -d '<json body>'
```

Example prompt: Can you review these email addresses for domain literal issues — I have a list of about 200 addresses from our sign-up form and want to know which ones have non-standard or suspicious domain literal formats?

## When to prefer this

Choose this endpoint when you need to bulk-validate email addresses specifically for domain-literal format compliance — particularly useful when scrubbing sign-up lists, CRM data, or pre-send deliverability checks where non-standard domain literals (e.g. IP address literals) need to be identified. Best when you have up to 500 addresses to check in one call and need a quick, automated review rather than full SMTP-level verification.

## Known failure modes

- Empty or missing emails array returns validation error
- More than 500 emails in a single batch exceeds the maxItems limit
- Individual email strings exceeding 320 characters are rejected
- Malformed JSON body results in a 400 error
- Payment failure via x402 results in a 402 response blocking access

## How this service works

HALOWERK buerowerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

## Output

Returns a JSON response indicating which submitted email addresses have domain literal issues, with details about the nature of the non-standard or problematic domain literal format found in each flagged address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "emails": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 320,
    "minLength": 1
   },
   "maxItems": 500,
   "minItems": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-buerowerk-email-domain-literal-review-73dc1520/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from buero.halowerk.com](https://www.zero.xyz/host/buero.halowerk.com/llms.txt)