# HALOWERK formwerk – iframe Datenfelder Prüfung

> HALOWERK formwerk – iframe Datenfelder Prüfung 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 an iframe element on a web page and returns the count of data fields transmitted by that iframe.

## Facts

- Endpoint: POST https://formwerk.halowerk.com/v1/pruef/formwerk/datenfelder/iframe?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-iframe-datenfelder-pr-fung-430c73e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F-Dnhd4XSjBlnFxbEsZWI

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-iframe-datenfelder-pr-fung-430c73e4 -d '<json body>'
```

Example prompt: Can you check how many data fields the iframe on https://example.com/contact is transmitting? Use the CSS selector '#contact-iframe' to target the right element.

## When to prefer this

Use this endpoint when you need to programmatically audit the number of data fields transmitted by an iframe embedded in a web page — particularly for privacy compliance (GDPR, ePrivacy), form QA, or third-party widget audits. It is purpose-built for iframe-specific data field counting, unlike generic web scrapers or full-page form analyzers.

## Known failure modes

- Invalid or unreachable URL returns an error — the target must be a publicly accessible HTTP(S) address
- CSS selector matches zero elements or multiple elements — first matching element is used, but a no-match may return an error
- Non-public or firewalled URLs will fail to load
- Malformed input schema (missing required 'ziel' field) returns a validation error
- iframe content blocked by cross-origin policies may prevent field inspection
- Timeout if the target page loads slowly

## How this service works

Prüft am Objekt iframe den Befund Zahl übermittelter Datenfelder.

## Output

Returns an inspection finding (Befund) for the targeted iframe element, specifically the count (Zahl) of data fields being transmitted by that iframe. The response indicates how many form/data fields the iframe submits or transmits.

## 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-iframe-datenfelder-pr-fung-430c73e4/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)