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AgentsToolsHub Readability Metrics
x402
AgentsToolsHub Readability Metrics is a paid API for AI agents from agentstoolshub.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Computes Flesch Reading Ease score, Flesch-Kincaid grade level, and word/sentence/syllable statistics for any block of text
Price / call$0.01
Success—
StatusUnknown
How this service works
Compute readability metrics for a block of text: Flesch Reading Ease score, Flesch-Kincaid grade level, and word/sentence/syllable statistics. Deterministic formulas — useful for checking documentation, prompts and agent output clarity. Use this when an agent needs to flesch reading-ease and grade level for any text.
Output
Returns a JSON object with the Flesch Reading Ease score (0–100 scale, higher = easier), Flesch-Kincaid grade level (US school grade equivalent), total word count, total sentence count, and total syllable count for the submitted text.
Example use cases
Documentation clarity check
“Can you run a readability check on this API documentation paragraph and tell me the Flesch Reading Ease score and grade level? I want to make sure it's accessible to developers who aren't native English speakers: 'Authentication tokens must be included in the Authorization header of each HTTP request using the Bearer scheme.'”
Agent prompt complexity audit
“Score the readability of this system prompt I wrote for my AI agent — give me the Flesch Reading Ease and Flesch-Kincaid grade level so I know if it's too complex: 'You are an intelligent assistant responsible for orchestrating multi-step workflows by decomposing user intents into discrete, executable subtasks and delegating them to specialized downstream agents.'”
Student writing grade-level check
“What's the Flesch-Kincaid grade level and reading ease score for this student essay intro? I need to know if it's writing at the right level for a 10th grader: 'The industrial revolution fundamentally transformed economic structures across Europe, displacing agrarian labor through mechanized production and catalyzing unprecedented urbanization.'”
Technical details
Endpoint
GEThttps://agentstoolshub.com/api/v1/dev/readability?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, deterministic readability metrics based on standard Flesch/Flesch-Kincaid formulas — ideal for checking documentation, agent prompts, educational content, or any text where clarity matters. Unlike LLM-based writing quality assessments, results are fully reproducible and formula-driven with no hallucination risk. Best when you need a numeric score rather than qualitative feedback.
Side effects
- Missing 'text' query parameter returns an error
- Empty string input may return zero or undefined scores
- Extremely short text (1–2 words) may yield unreliable or edge-case scores
- Non-English text may produce inaccurate syllable counts since formulas are English-calibrated
- Very long text strings may hit URL length limits for GET requests
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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