# German Readability Scorer (Flesch-Amstad + Wiener Sachtextformel)

> German Readability Scorer (Flesch-Amstad + Wiener Sachtextformel) is a paid API for AI agents from api.ozdreamtools.de, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Scores the readability of a German text using the Flesch Reading Ease (Amstad adaptation) and all four Wiener Sachtextformel variants, returning scores, underlying linguistic counts, and the formulas used.

## Facts

- Endpoint: POST https://api.ozdreamtools.de/api/readability
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/german-readability-scorer-flesch-amstad-wiener-sachtextformel-3844a635
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FN6EDwgHCZSdOuca-wdFV

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 german-readability-scorer-flesch-amstad-wiener-sachtextformel-3844a635 -d '<json body>'
```

Example prompt: Can you check how readable this German text is? Give me the Flesch Reading Ease (Amstad) score and all four Wiener Sachtextformel variants, plus the sentence, word, and syllable counts: 'Der Bundestag hat heute ein neues Gesetz verabschiedet, das weitreichende Folgen für die Bürger haben wird.'

## When to prefer this

Choose this endpoint when you need standardized German-language readability metrics, specifically the Flesch Reading Ease Amstad adaptation and Wiener Sachtextformel — the two formulas most commonly cited in German-language content quality, journalism, and plain-language compliance contexts. Prefer it over generic readability APIs that use English-only Flesch-Kincaid, which is miscalibrated for German syllable and word structure. It is especially useful when you need the underlying counts and formulas for auditability or to recompute scores manually.

## Known failure modes

- Empty or missing text input returns an error
- Non-German text may produce inaccurate scores due to German-specific syllable and formula calibration
- Syllable counts are approximated via vowel-group heuristic, not exact — noted in response
- Very short texts (e.g. single word) may yield meaningless or extreme scores
- Malformed request body (missing required field) returns a 4xx error

## How this service works

Scores how readable a German text is: Flesch Reading Ease (Amstad adaptation) plus the four Wiener Sachtextformel variants. Returns both scores, the underlying counts (sentences, words, syllables, sentence length) and the formulas, so the result can be recomputed. Syllable counting is a disclosed approximation (vowel-group heuristic), not an official certification.

## Output

Returns the Flesch Reading Ease score (Amstad adaptation for German), all four Wiener Sachtextformel variant scores, underlying linguistic counts (number of sentences, words, syllables, average sentence length), and the actual formulas used — enabling full manual recomputation of the scores.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "description": "German text whose readability is to be measured"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/german-readability-scorer-flesch-amstad-wiener-sachtextformel-3844a635/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.ozdreamtools.de](https://www.zero.xyz/host/api.ozdreamtools.de/llms.txt)