# WriteGrade Text Scoring API

> WriteGrade Text Scoring API is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).

Scores and grades a draft text passage, returning quality metrics for the submitted writing sample.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/writegrade?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/writegrade-text-scoring-api-0e50a1fc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b7_ELbABuSbv6ceDoAqyX

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 writegrade-text-scoring-api-0e50a1fc
```

Example prompt: Can you grade this draft for me and tell me how good the writing is? Here's the text: 'The quick brown fox jumps over the lazy dog. This sentence exemplifies clarity and brevity in modern prose.'

## When to prefer this

Choose this endpoint when you need a quick, low-cost ($0.005 USDC) programmatic writing quality score for a text draft up to 4000 characters. It is particularly suited for AI agents that need to evaluate or filter writing quality in automated pipelines and can handle x402 micropayment flows via the OpenX402 facilitator.

## Known failure modes

- Missing 'text' query parameter returns an error or empty result
- Text exceeding 4000 characters may be rejected or truncated
- Unpaid requests (no valid x402 payment) return HTTP 402 with EIP-3009 payment details
- Non-GET/HEAD/DELETE methods return method-not-allowed errors
- Empty string input may return a default or error response

## How this service works

Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.

## Output

Returns a writing quality grade or score for the submitted text, including diagnostic metrics such as readability, clarity, or other quality indicators relevant to the draft passage.

## 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",
     "properties": {
      "text": {
       "type": "string",
       "description": "Draft to score. Required. Max 4000 characters."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  },
  "inputSchema": {
   "type": "object",
   "required": [
    "type",
    "properties"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "object"
    },
    "required": {
     "type": "array",
     "items": {
      "type": "string"
     }
    },
    "properties": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/writegrade-text-scoring-api-0e50a1fc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from openclawproductions.com](https://www.zero.xyz/host/openclawproductions.com/llms.txt)