# HALOWERK buerowerk — Email Allowed-Domain Partition Filter

> HALOWERK buerowerk — Email Allowed-Domain Partition Filter 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).

Partitions a list of email addresses by checking which ones belong to a set of allowed domains, separating allowed from disallowed addresses.

## Facts

- Endpoint: POST https://buero.halowerk.com/v1/baumarkt/mail/allowed-domain-partition?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-allowed-domain-partition-filter-a578f2af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sSrunw2f9UgiqPD1eEPEA

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-allowed-domain-partition-filter-a578f2af -d '<json body>'
```

Example prompt: Can you filter this list of emails and separate out which ones belong to the allowed domains 'acme.com' and 'partner.org'? Here are the emails: alice@acme.com, bob@random.io, carol@partner.org, dave@unknown.net.

## When to prefer this

Choose this endpoint when you need to batch-validate or partition a list of email addresses against a domain allowlist in a single call, especially within an automated workflow requiring micropayment-gated, privacy-respecting domain filtering without sending any emails or performing full SMTP validation.

## Known failure modes

- Empty or missing emails array returns an error
- Empty or missing allowed_domains array returns an error
- Emails array exceeding 500 entries is rejected
- Allowed_domains array exceeding 100 entries is rejected
- Malformed email strings (exceeding 320 chars) are rejected
- Payment failure via x402 (402 response) if USDC payment is insufficient

## How this service works

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

## Output

A JSON response partitioning the input email addresses into two groups: those whose domains appear in the allowed_domains list, and those whose domains do not. Returns structured data categorizing each email as allowed or disallowed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "emails": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 320,
    "minLength": 1
   },
   "maxItems": 500,
   "minItems": 1
  },
  "allowed_domains": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 253,
    "minLength": 1
   },
   "maxItems": 100,
   "minItems": 1
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-buerowerk-email-allowed-domain-partition-filter-a578f2af/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)