# HALOWERK buerowerk — Blocked Domain Email Filter

> HALOWERK buerowerk — Blocked Domain Email Filter is a paid API for AI agents from buero.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-18).

Checks a list of email addresses against a list of blocked domains and returns which emails are affected or applies the block rule.

## Facts

- Endpoint: POST https://buero.halowerk.com/v1/baumarkt/mail/blocked-domain-apply?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-buerowerk-blocked-domain-email-filter-1cf2349c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__d3yB3NduNQ_xpErb4HOi

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-blocked-domain-email-filter-1cf2349c -d '<json body>'
```

Example prompt: Check these emails — user@tempmail.com, contact@legit.org, hello@blocked-domain.net — against my blocked domain list [tempmail.com, blocked-domain.net] and tell me which ones are flagged.

## When to prefer this

Use this endpoint when you need to programmatically screen a batch of email addresses against a custom or curated list of blocked domains — for example, to enforce signups from business emails only, filter out disposable email providers, or apply compliance-driven domain bans. Prefer this over client-side filtering when you need a consistent, server-enforced blocklist applied across multiple services.

## Known failure modes

- Missing or malformed emails array returns a validation error
- Missing or empty blocked_domains list may result in no matches being returned
- Invalid email format in the input list may cause parsing errors
- Payment failure via x402 protocol returns HTTP 402 before processing
- Empty input arrays may return an empty result set without error

## How this service works

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

## Output

Returns a JSON response indicating which email addresses match the provided blocked domains, allowing the caller to identify, filter, or reject emails associated with unwanted or prohibited domains.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "emails": {
   "$ref": "#/$defs/me5877878f0"
  },
  "blocked_domains": {
   "$ref": "#/$defs/me5877878f0"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-buerowerk-blocked-domain-email-filter-1cf2349c/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)