# HALOWERK buerowerk — Recipient Domain Distribution

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

Analyzes a list of email addresses and returns a distribution breakdown of recipient domains (e.g. gmail.com, outlook.com).

## Facts

- Endpoint: POST https://buero.halowerk.com/v1/baumarkt/mail/recipient-domain-distribution?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-buerowerk-recipient-domain-distribution-f6a11b17
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EinQmNzlVzr-_WMA5mYiR

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-recipient-domain-distribution-f6a11b17 -d '<json body>'
```

Example prompt: Can you analyze these 200 email addresses and show me a breakdown of how many recipients are on each domain — like how many are gmail.com, how many are yahoo.com, and so on?

## When to prefer this

Use this endpoint when you need a fast, server-side aggregation of email domain frequencies from a batch of up to 500 emails. Ideal for audience analysis, deliverability planning, or CRM segmentation without writing your own parsing logic. Prefer this over manual regex grouping when working within an automated agent pipeline with x402 payment support.

## Known failure modes

- Empty emails array returns an error (minItems: 1 required)
- Malformed email strings may be counted or skipped without warning
- Lists exceeding 500 emails are rejected (maxItems: 500)
- Strings exceeding 320 characters are rejected per item schema
- Payment failure via x402 results in a 402 response before processing

## How this service works

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

## Output

A JSON object containing a distribution of recipient email domains, mapping each unique domain (e.g. gmail.com, company.com) to the count of email addresses belonging to that domain from the submitted list.

## 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-recipient-domain-distribution-f6a11b17/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)