# Aurenic Readability Metrics API

> Aurenic Readability Metrics API is a paid API for AI agents from api.aurenic.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-29).

Computes readability metrics including Flesch-Kincaid score and word counts for a given text

## Facts

- Endpoint: GET https://api.aurenic.org/readability/:b64?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aurenic-readability-metrics-api-b19b345d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZbCOTKclXSw0l77JB8Dcj

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 aurenic-readability-metrics-api-b19b345d
```

Example prompt: Can you check the readability of this article draft and give me the Flesch-Kincaid score and word count? Here's the text: 'The mitochondria is the powerhouse of the cell. Scientists have studied its role in cellular respiration for decades, finding that it converts glucose into ATP through a complex biochemical process.'

## When to prefer this

Choose this endpoint when you need fast, lightweight readability scoring without sending large payloads in a request body — the base64 path encoding makes it easy to call via GET. Ideal for agents doing quick content quality checks at $0.001 per call with no authentication overhead beyond x402 micropayment.

## Known failure modes

- Invalid or malformed base64 encoding in the path parameter returns an error
- Empty or whitespace-only text yields minimal or zero metrics
- Extremely long texts may hit size limits
- Non-text binary content encoded as base64 may produce nonsensical scores

## How this service works

Readability metrics: Flesch-Kincaid, word counts

## Output

Returns Flesch-Kincaid readability score and word count metrics for the submitted text. The Flesch-Kincaid score indicates reading ease (higher = easier to read) and/or grade level, helping gauge audience suitability.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "b64"
     ],
     "properties": {
      "b64": {
       "type": "string"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aurenic-readability-metrics-api-b19b345d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.aurenic.org](https://www.zero.xyz/host/api.aurenic.org/llms.txt)