# Formwerk Input Field Label Check

> Formwerk Input Field Label Check is a paid API for AI agents from formwerk.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).

Checks whether an input field element on a web page has a visible field label (Befund: vorhandene Feldbeschriftung).

## Facts

- Endpoint: POST https://formwerk.halowerk.com/v1/pruef/formwerk/label/eingabefeld
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/formwerk-input-field-label-check-943769e7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b5DEJREDl22XLbPd_CfHl

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 formwerk-input-field-label-check-943769e7 -d '<json body>'
```

Example prompt: Can you check whether the input fields on https://example.com/contact have proper labels? Use the CSS selector '#email-input' to focus on the email field specifically.

## When to prefer this

Use this endpoint when you need to specifically verify whether HTML input fields have associated labels on a given public web page — particularly for accessibility audits, QA pipelines, or form compliance checks. Prefer this over generic scraping tools when you need a structured, per-field label presence finding rather than raw HTML.

## Known failure modes

- URL is not publicly accessible or returns a non-200 status
- CSS selector matches no elements or matches multiple elements unexpectedly
- Page requires authentication and cannot be crawled
- Target page blocks automated access (CAPTCHA, bot protection)
- Malformed or overly long URL rejected by input validation
- Input field has no label and the finding returns a negative/absent result

## How this service works

Prüft am Objekt eingabefeld den Befund vorhandene Feldbeschriftung.

## Output

Returns a finding (Befund) indicating whether the targeted input field element on the given page has an associated visible field label, including details about the label presence status.

## 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/formwerk-input-field-label-check-943769e7/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)