# Touchstone Readability Scorer

> Touchstone Readability Scorer is a paid API for AI agents from touchstone.locomot.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Computes deterministic readability scores (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) for any input text using published formulas

## Facts

- Endpoint: GET https://touchstone.locomot.io/readability
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/touchstone-readability-scorer-8e468e22
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OYlGx-Mobsv2UqL-WKFNN

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 touchstone-readability-scorer-8e468e22
```

Example prompt: What's the readability score of this paragraph? 'The mitochondrial DNA sequence exhibits polymorphic variation across heteroplasmic populations, necessitating longitudinal genomic surveillance.' I want Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI.

## When to prefer this

Choose this endpoint when you need deterministic, reproducible readability scores based on established published formulas rather than AI-generated estimates. Ideal for content grading, editorial review pipelines, compliance checking, or any use case requiring auditable, formula-based results across all six major readability indexes simultaneously.

## Known failure modes

- Missing 'text' query parameter returns an error
- Empty string input may produce undefined or zero scores
- Extremely short text (1-2 words) may yield unreliable or extreme scores
- Text with no sentence-ending punctuation may miscalculate sentence counts
- Non-English text may produce inaccurate syllable counts and scores

## How this service works

Deterministic readability scores (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) over published formulas. For long text use POST. Signed.

## Output

A JSON object containing multiple readability scores (Flesch reading ease, Flesch-Kincaid grade level, Gunning Fog, SMOG, Coleman-Liau, ARI), text counts (words, sentences, syllables), estimated reading time in seconds, and the scoring method used — all computed deterministically from published formulas.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "text"
     ],
     "properties": {
      "text": {
       "type": "string",
       "description": "the text to score"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "op": {
     "type": "string"
    },
    "counts": {
     "type": "object"
    },
    "method": {
     "type": "string"
    },
    "scores": {
     "type": "object"
    },
    "source": {
     "type": "string"
    },
    "reading_time_seconds": {
     "type": "number"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/touchstone-readability-scorer-8e468e22/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from touchstone.locomot.io](https://www.zero.xyz/host/touchstone.locomot.io/llms.txt)