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energybilltoolkit.co.uk Text Readability Estimator
x402
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.
Price / call$0.01
Success—
StatusUnknown
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 use cases
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.'”
Technical details
Endpoint
POSThttps://energybilltoolkit.co.uk/text-metrics/api/tools/readabilityWhen to prefer
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.
Side effects
- 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
Input
{
"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."
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text to measure. |
Output
{
"metric": "readability",
"warnings": [
{
"code": "short_text",
"message": "Readability and frequency metrics are unstable below about 100 words.",
"severity": "caution"
}
],
"readability": {
"method": "English Flesch formulas with heuristic syllable counting; directional, not authoritative.",
"syllables": 60,
"flesch_reading_ease": 50.64,
"flesch_kincaid_grade": 7.89,
"average_syllables_per_word": 1.765,
"average_sentence_length_words": 6.8
}
}Tags
x402
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