# Saylor Innovations Data Desk – Text Readability Analyzer

> Saylor Innovations Data Desk – Text Readability Analyzer is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Computes multiple readability scores (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, ARI, Coleman-Liau) plus grade level, reading time, and writing advice for a given English text

## Facts

- Endpoint: GET https://saylorinnovations.com/api/text/readability?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-data-desk-text-readability-analyzer-5189371b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LGLXI0g6ICgTG_llQvR6i

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 saylor-innovations-data-desk-text-readability-analyzer-5189371b
```

Example prompt: Can you check the readability of this paragraph and tell me its Flesch reading ease score, grade level, and how long it would take to read? Here's the text: 'The mitochondria is the powerhouse of the cell, producing ATP through oxidative phosphorylation in a process regulated by complex enzyme cascades.'

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-index readability assessment of English text in a single call — especially when you want Flesch, Gunning Fog, SMOG, and Coleman-Liau scores together alongside human-readable advice and time estimates. Prefer it over manual formula implementations or single-metric tools when you need a consensus grade level and actionable writing suggestions in one lightweight API call.

## Known failure modes

- Text shorter than 20 or longer than 5000 characters returns a validation error
- Non-English text may produce inaccurate or nonsensical scores since the algorithms are calibrated for English
- Missing required 'text' query parameter returns an error
- Very short texts (1-2 sentences) may return null for some metrics like SMOG that require a minimum number of sentences
- Payment not processed results in 402 response before analysis is run

## How this service works

Readability scores for English text - Flesch reading ease, Flesch-Kincaid, Gunning Fog, SMOG, ARI and Coleman-Liau, grade level, reading time and advice

## Output

A JSON object containing word count, sentence count, syllable count, complex word count and percentage, Flesch reading ease score, Flesch-Kincaid grade, Gunning Fog index, SMOG index, Coleman-Liau index, ARI score, consensus grade level, a reading level label (e.g. '8th grade'), estimated reading time in minutes, speaking time in minutes, a data source note, optional caveats, and plain-English writing advice.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "text"
     ],
     "properties": {
      "text": {
       "type": "string",
       "description": "English text to analyse, 20-5000 characters"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "words",
      "flesch_reading_ease",
      "reading_level"
     ],
     "properties": {
      "note": {
       "type": "string",
       "description": "Caveat or context for reading the result"
      },
      "words": {
       "type": "number",
       "description": "Words"
      },
      "advice": {
       "type": "string",
       "description": "The advice text"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      },
      "sentences": {
       "type": "number",
       "description": "Sentences"
      },
      "syllables": {
       "type": [
        "number",
        "null"
       ],
       "description": "Estimated syllable count of the text"
      },
      "smog_index": {
       "type": [
        "number",
        "null"
       ],
       "description": "Smog index"
      },
      "gunning_fog": {
       "type": "number",
       "description": "Gunning fog"
      },
      "coleman_liau": {
       "type": [
        "number",
        "null"
       ],
       "description": "Coleman liau"
      },
      "complex_words": {
       "type": [
        "number",
        "null"
       ],
       "description": "Complex words"
      },
      "reading_level": {
       "type": "string",
       "description": "Reading level"
      },
      "consensus_grade": {
       "type": "number",
       "description": "Consensus grade"
      },
      "characters_in_words": {
       "type": [
        "number",
        "null"
       ],
       "description": "Characters in words"
      },
      "flesch_reading_ease": {
       "type": "number",
       "description": "Fl
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-data-desk-text-readability-analyzer-5189371b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)