# HALOWERK formwerk – Cookie Third-Party Domain Count Check

> HALOWERK formwerk – Cookie Third-Party Domain Count Check is a paid API for AI agents from formwerk.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-23).

Checks a cookie object on a web page and returns the number of contacted third-party (foreign) domains.

## Facts

- Endpoint: POST https://formwerk.halowerk.com/v1/pruef/formwerk/fremddomain/cookie?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-formwerk-cookie-third-party-domain-count-check-f9682a44
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hpisTE2bNi4h12BMdPTTK

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-formwerk-cookie-third-party-domain-count-check-f9682a44 -d '<json body>'
```

Example prompt: Can you check how many third-party (foreign) domains are being contacted through the cookies on https://example.com — I want to know if our site is leaking data to outside domains via cookies.

## When to prefer this

Choose this endpoint when you specifically need to measure the breadth of third-party domain exposure through cookies on a given web page — especially for privacy audits, GDPR/ePrivacy compliance checks, or tracking detection workflows. It is more focused than general cookie scanners, targeting precisely the count of foreign domains a cookie contacts rather than cookie content or form analysis.

## Known failure modes

- URL is unreachable or returns a non-2xx HTTP status
- No cookie object found at the target URL
- CSS selector matches zero or multiple elements ambiguously
- URL is not publicly accessible (private IP, localhost, intranet)
- Malformed or excessively long URL input
- Target site blocks automated requests or returns CAPTCHA

## How this service works

Prüft am Objekt cookie den Befund Zahl kontaktierter Fremddomains.

## Output

Returns a numeric finding representing the count of third-party (foreign) domains contacted by the cookie object found at the specified URL. May include supporting details about the specific domains or how the count was determined.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ziel": {
   "oneOf": [
    {
     "type": "string",
     "maxLength": 2048,
     "minLength": 1,
     "description": "Öffentliche HTTP(S)-Adresse; bei DNS-Befunden Domain oder öffentliche IP."
    },
    {
     "type": "object",
     "required": [
      "adresse"
     ],
     "properties": {
      "adresse": {
       "type": "string",
       "maxLength": 2048,
       "minLength": 1
      },
      "selektor": {
       "type": "string",
       "maxLength": 240,
       "minLength": 1,
       "description": "CSS-Selektor: genau ein Objekt, sonst erster Treffer des Objektfilters."
      },
      "vergleich": {
       "type": "string",
       "maxLength": 2048,
       "description": "Öffentliche Vergleichsadresse für Link-, Sitemap- oder Sprachbefunde."
      },
      "user_agent": {
       "type": "string",
       "pattern": "^[A-Za-z0-9_-]{1,80}$"
      },
      "dkim_selektor": {
       "type": "string",
       "pattern": "^[A-Za-z0-9_-]{1,63}$"
      }
     },
     "additionalProperties": false
    }
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-formwerk-cookie-third-party-domain-count-check-f9682a44/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from formwerk.halowerk.com](https://www.zero.xyz/host/formwerk.halowerk.com/llms.txt)