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agent402.tools Readability Score
x402
agent402.tools Readability Score 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).
Computes four standard readability metrics (Flesch-Kincaid Grade Level, Flesch Reading Ease, Gunning Fog Index, Automated Readability Index) plus word, sentence, and syllable counts from input text.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compute Flesch-Kincaid Grade Level, Flesch Reading Ease, Gunning Fog Index, and Automated Readability Index from text. Returns all 4 scores plus word, sentence, and syllable counts.
Output
Returns all four readability scores (Flesch-Kincaid Grade Level, Flesch Reading Ease, Gunning Fog Index, Automated Readability Index) plus the word count, sentence count, and syllable count derived from the submitted text.
Example use cases
Example prompt
“Can you check the readability of this paragraph and give me the Flesch-Kincaid grade level, Flesch Reading Ease, Gunning Fog, and ARI scores: 'The mitochondria is the powerhouse of the cell, generating ATP through oxidative phosphorylation in a highly regulated biochemical process.'?”
Technical details
Endpoint
POSThttps://agent402.tools/api/readability-scoreWhen to prefer
Choose this endpoint when you need multiple standard readability metrics computed in a single call rather than individually. It is ideal when you want both grade-level estimates (Flesch-Kincaid, Gunning Fog, ARI) and an ease score (Flesch Reading Ease) together, along with raw linguistic counts (words, sentences, syllables) for further analysis.
Side effects
- Text shorter than 10 characters returns a validation error
- Empty or missing 'text' field returns a 400 bad request
- Very short single-word inputs may produce unreliable or zero-division scores
- Payment not included or insufficient USDC returns a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text to analyze (min 10 chars) |
Output
Schema · Response
{
"type": "json",
"example": {
"words": 16,
"sentences": 3,
"syllables": 17,
"gunningFog": 3.2,
"fleschReadingEase": 104.59,
"fleschKincaidGrade": -0.89,
"automatedReadability": -2.84
}
}Tags
x402
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