# text-readability

> text-readability is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-27).

Computes readability metrics for a given text, including Flesch Reading Ease and Flesch-Kincaid Grade Level scores

## Facts

- Endpoint: GET https://x402.agentindex.world/text/readability?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/text-readability-c8b978e7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Kshyz__xyfZJqqvwU5LBq

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 text-readability-c8b978e7
```

Example prompt: Can you check the readability of this paragraph and tell me the Flesch Reading Ease score and grade level? 'The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs.'

## When to prefer this

Use this endpoint when you need fast, structured readability metrics (Flesch scores) for a snippet of text without setting up NLP libraries. Ideal for content QA pipelines, educational tools, and writing assistants that need a programmatic readability signal per call.

## Known failure modes

- Missing or empty 'text' parameter returns an error
- Very short texts (single word) may produce extreme or negative grade scores
- Non-English text may yield inaccurate syllable counts and scores since the algorithm is designed for English
- Extremely long texts may increase latency

## How this service works

Flesch Reading Ease and Flesch-Kincaid Grade Level scores for English text (standard public formulas, heuristic syllable counting).

## Output

Returns a JSON object with word count, sentence count, syllable count, Flesch Reading Ease score (higher = easier), and Flesch-Kincaid Grade Level (school grade level equivalent).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "title": "Text"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "words": 11,
  "sentences": 2,
  "syllables": 12,
  "flesch_reading_ease": 108.96,
  "flesch_kincaid_grade": -0.57
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/text-readability-c8b978e7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.agentindex.world](https://www.zero.xyz/host/x402.agentindex.world/llms.txt)