# HALOWERK formwerk – Pixel Foreign Domain Contact Count

> HALOWERK formwerk – Pixel Foreign Domain Contact Count 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 pixel object on a webpage and returns the count of distinct third-party (foreign) domains it contacts.

## Facts

- Endpoint: POST https://formwerk.halowerk.com/v1/pruef/formwerk/fremddomain/pixel?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-pixel-foreign-domain-contact-count-01a53310
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dy5hdPeeF4VL5quCuXm79

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-pixel-foreign-domain-contact-count-01a53310 -d '<json body>'
```

Example prompt: Check the tracking pixel at https://example.com/checkout and tell me how many distinct foreign (third-party) domains it contacts.

## When to prefer this

Use this endpoint when you need to audit specifically pixel objects (tracking pixels, analytics pixels) for their third-party domain contact count, as opposed to iframes or cookies. Ideal for privacy compliance workflows (GDPR, ePrivacy) where you need to quantify external data sharing caused by pixels embedded in a page. Prefer this over generic crawlers when you need a structured, per-object finding focused on foreign domain contacts.

## Known failure modes

- URL is unreachable or returns non-200 status — endpoint cannot fetch target
- No pixel object found at URL or matching the given CSS selector — empty result
- Target URL is not publicly accessible (private network, authentication required) — error returned
- Malformed URL input — validation error
- Pixel loads no external resources — count returned as zero
- Request timeout if target page is slow to load

## How this service works

Prüft am Objekt pixel den Befund Zahl kontaktierter Fremddomains.

## Output

Returns the number of distinct third-party (foreign) domains contacted by the pixel object found at the given URL or identified via CSS selector. Provides an integer count of external domain contacts as part of the audit findings.

## 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-pixel-foreign-domain-contact-count-01a53310/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)