# HALOWERK formwerk – Eingabefeld Fremddomain-Zählung

> HALOWERK formwerk – Eingabefeld Fremddomain-Zählung 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 web form input field and returns the count of external (third-party) domains contacted by that field.

## Facts

- Endpoint: POST https://formwerk.halowerk.com/v1/pruef/formwerk/fremddomain/eingabefeld?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-eingabefeld-fremddomain-z-hlung-4cd66c27
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pWbPIr14hCdj9FZAJWUKL

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-eingabefeld-fremddomain-z-hlung-4cd66c27 -d '<json body>'
```

Example prompt: Check how many external (foreign) domains are contacted by the email input field on https://example.com/register — use the CSS selector '#email-input' to target it.

## When to prefer this

Choose this endpoint when you specifically need to count external third-party domain contacts originating from a particular input field on a web page — for privacy audits, GDPR compliance checks, or tracking analysis at the form-field level. It is more granular than page-level or form-level domain contact checks, allowing targeting of a specific field via CSS selector.

## Known failure modes

- Invalid or inaccessible URL returns an error or empty result
- CSS selector matches no element or multiple elements — first match is used, wrong target may be analyzed
- Private/internal URLs not reachable from the crawler return a connection error
- Malformed ziel object (missing required 'adresse' field) returns a validation error
- Dynamic single-page apps that load contacts asynchronously may under-report domain contacts
- Rate limiting may occur for rapid repeated calls to the same target

## How this service works

Prüft am Objekt eingabefeld den Befund Zahl kontaktierter Fremddomains.

## Output

Returns a numeric finding (Befund) representing the count of foreign/external domains (Fremddomains) that are contacted in relation to the targeted input field on the given web page. May include details about which external domains were observed.

## 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-eingabefeld-fremddomain-z-hlung-4cd66c27/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)