# HALOWERK formwerk – Banner Foreign Domain Contact Count Check

> HALOWERK formwerk – Banner Foreign Domain Contact 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 the number of third-party (foreign) domains contacted by banner elements on a given webpage, as part of a consent/GDPR compliance audit.

## Facts

- Endpoint: POST https://formwerk.halowerk.com/v1/pruef/formwerk/fremddomain/banner?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-banner-foreign-domain-contact-count-check-8508b8ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7e7trUSXIRslaVCdScJVm

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-banner-foreign-domain-contact-count-check-8508b8ee -d '<json body>'
```

Example prompt: Check how many third-party domains are contacted by the cookie banner on https://example.com — I need to know if it's reaching out to foreign domains for a GDPR compliance review.

## When to prefer this

Use this endpoint specifically when you need to audit the number of third-party domains contacted by banner elements (e.g. cookie consent banners) on a webpage. It is part of a GDPR/ePrivacy compliance suite and is distinguished from sibling endpoints that check cookies, scripts, pixels, iframes, or form submissions. Choose this over generic network analysis tools when you need a structured compliance finding specifically scoped to banner objects and foreign domain contacts.

## Known failure modes

- Invalid or unreachable URL returns an error or empty result
- CSS selector matches zero elements, falling back to first matching object or returning no finding
- Target site blocks automated requests (403/bot detection), resulting in incomplete scan
- Ambiguous selector matching multiple elements may yield result for only the first match
- Non-public or private IP addresses rejected per input constraints

## How this service works

Prüft am Objekt banner den Befund Zahl kontaktierter Fremddomains.

## Output

Returns a structured finding indicating the number of third-party (foreign) domains contacted by the banner element on the target page. This allows compliance teams to assess whether the banner triggers unauthorized third-party tracking before or during consent interactions.

## 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-banner-foreign-domain-contact-count-check-8508b8ee/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)