# HALOWERK buerowerk — Email Potential Plus Aliases

> HALOWERK buerowerk — Email Potential Plus Aliases 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).

Given a list of email addresses, returns potential plus-alias variants (e.g. user+tag@domain.com) for each address

## Facts

- Endpoint: POST https://buero.halowerk.com/v1/baumarkt/mail/potential-plus-aliases?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-email-potential-plus-aliases-263316c5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EQCz1sW6GoFHk3mNZ4Knn

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-potential-plus-aliases-263316c5 -d '<json body>'
```

Example prompt: Take this list of email addresses and give me all the potential plus-alias variants each one could have, like user+tag@example.com forms.

## When to prefer this

Use this endpoint when you need to systematically enumerate or discover the plus-alias (subaddressing) variants of a set of known email addresses — for example, to detect duplicate registrations, enrich a contact list, audit alias abuse, or prepare suppression lists. Prefer this over manual string manipulation when working with batches of up to 500 emails at once.

## Known failure modes

- Empty or missing emails array returns a validation error
- Email strings exceeding 320 characters are rejected
- Array exceeding 500 items may be rejected or truncated
- Malformed email strings may be skipped or cause errors
- Payment failure via x402 results in 402 response before processing
- Invalid JSON body returns 400 error

## How this service works

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

## Output

A JSON response containing, for each input email address, the set of potential plus-alias variants (subaddress forms such as user+tag@domain.com) that could be derived from that 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-potential-plus-aliases-263316c5/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)