# energybilltoolkit.co.uk Text Readability Estimator

> energybilltoolkit.co.uk Text Readability Estimator is a paid API for AI agents from energybilltoolkit.co.uk, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns rough English readability estimates (e.g. Flesch, grade level) with caveats for text that is short, bullet-heavy, heading-heavy, or mixed-language.

## Facts

- Endpoint: POST https://energybilltoolkit.co.uk/text-metrics/api/tools/readability
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/energybilltoolkit-co-uk-895f8ba1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a53V--Go2wwoaAPJ0vuKY

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 energybilltoolkit-co-uk-895f8ba1 -d '<json body>'
```

Example prompt: Can you give me a readability estimate with caveats for this text — it's a short bullet-point list with some headings: 'Energy saving tips: • Turn off lights. • Use LED bulbs. • Reduce heating by 1°C.'

## When to prefer this

Use this endpoint when you need a quick English readability estimate and want honest caveats about reliability — especially for short, structured, or mixed-language content where standard readability formulas are known to mislead. Prefer this over generic NLP libraries when you need built-in transparency about estimate limitations.

## Known failure modes

- Empty or missing text body returns an error or zero-score response
- Non-English or heavily mixed-language text returns low-confidence scores with caveats
- Extremely short text (1-2 words) may produce unreliable scores flagged with warnings
- Malformed JSON request body returns a 400-level error
- Text consisting entirely of headings or bullets may return a caveat-only response with no reliable score

## How this service works

Return rough English readability estimates with caveats for short, bullet-heavy, heading-heavy, or mixed-language text.

## Output

Returns rough English readability scores (such as Flesch Reading Ease or grade-level estimates) along with specific caveats explaining when the estimate may be unreliable — e.g. if the text is too short, dominated by bullets or headings, or contains mixed-language content.

## Example request

```json
{
 "text": "Energy efficiency tips for reducing your bills: • Turn off lights when not in use. • Install LED bulbs to save electricity. • Reduce heating temperature by 1°C. • Use a programmable thermostat. • Insulate your home properly."
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "description": "Text to measure."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/energybilltoolkit-co-uk-895f8ba1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from energybilltoolkit.co.uk](https://www.zero.xyz/host/energybilltoolkit.co.uk/llms.txt)