# agent402.tools Content Grade

> agent402.tools Content Grade is a paid API for AI agents from agent402.tools, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-14).

Bundled workflow that extracts readable content from a URL, analyzes keyword density, and scores readability in a single paid call.

## Facts

- Endpoint: POST https://agent402.tools/api/skill/content-grade
- Price: $0.012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent402-tools-content-grade-05ef910a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kwfzOENUfUWaWFuhnpIhL

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 agent402-tools-content-grade-05ef910a -d '<json body>'
```

Example prompt: Can you grade the content quality of https://example.com/my-blog-post — I want to know the keyword density and readability score?

## When to prefer this

Use this endpoint when you need a bundled, single-payment content audit covering extraction, keyword density, and readability in one shot — rather than calling three separate tools individually. Ideal for SEO audits, content quality checks before publishing, or comparing page quality across multiple URLs efficiently.

## Known failure modes

- URL is unreachable or returns non-200 — extraction step fails, downstream steps may be skipped
- Page has no extractable text (e.g. pure JavaScript SPA with no SSR) — content extraction returns empty
- Payment not completed — entire workflow blocked with 402 response
- Partial failure: extraction succeeds but keyword or readability step errors — result includes per-step status
- Invalid or malformed URL input — request rejected with validation error

## How this service works

Bundled execution of the Content grade workflow - Grade a page's content quality - extract the readable content then analyze keyword density. One x402 payment runs 3 underlying tools (extract, keywords, readability-score); partial-success per step.

## Output

Returns a composite content grade combining: (1) extracted readable text from the page, (2) keyword density analysis, and (3) a readability score — with partial-success reporting per step if any sub-tool fails.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "URL of the page to grade"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "args": {
   "url": "https://blog.cloudflare.com/x402/"
  },
  "pack": "content-grade",
  "steps": [
   {
    "ok": true,
    "slug": "extract",
    "result": {}
   },
   {
    "ok": true,
    "slug": "keywords",
    "result": {}
   },
   {
    "ok": true,
    "slug": "readability-score",
    "result": {}
   }
  ],
  "summary": "3/3 steps succeeded"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent402-tools-content-grade-05ef910a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)