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Flesch Readability Scorer
x402
Flesch Readability Scorer is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Calculates Flesch Reading Ease score and Flesch–Kincaid grade level for English text, plus word, sentence, and syllable counts.
Price / call$0.001
Success—
StatusUnknown
How this service works
Flesch Reading Ease score and Flesch–Kincaid grade level for English text, plus word/sentence/syllable counts.
Output
Returns Flesch Reading Ease score (0–100 scale where higher = easier), Flesch–Kincaid grade level (US school grade equivalent), and raw counts for words, sentences, and syllables in the submitted text.
Example use cases
Example prompt
“Can you tell me the Flesch Reading Ease score and grade level for this paragraph: 'The mitochondria is the powerhouse of the cell. It converts nutrients into adenosine triphosphate, which powers cellular activity.'”
Technical details
Endpoint
POSThttps://agent402.tools/api/readabilityWhen to prefer
Use this endpoint when you need standardized Flesch readability metrics (Reading Ease + Kincaid grade level) for English prose, particularly for content quality checks, accessibility audits, or academic writing evaluation. Prefer this over general-purpose LLM readability assessments when you need reproducible, formula-based numeric scores.
Side effects
- Empty or missing 'text' field returns a validation error
- Non-English text may produce inaccurate scores since the algorithm is calibrated for English
- Extremely short text (single word) may yield unreliable or edge-case scores
- Payment failure (402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string |
Output
Schema · Response
{
"type": "json",
"example": {
"words": 9,
"sentences": 2,
"gradeLevel": 0.5,
"readingEase": 100
}
}Tags
x402
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