# x402-tools CT402 Diagnostics

> x402-tools CT402 Diagnostics is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).

Runs paid x402 protocol diagnostics on a public URL, verifying HTTP 402 payment flow and EIP-3009 payment extras via OpenX402 facilitator

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/ct402?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-ct402-diagnostics-f025b05d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9xyknk6OAWAw_rwrQbXwJ

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 x402-tools-ct402-diagnostics-f025b05d
```

Example prompt: Can you run an x402 diagnostic probe on https://myapi.example.com/paid-endpoint to check whether it correctly returns an HTTP 402 with EIP-3009 payment extras?

## When to prefer this

Choose this endpoint when you need to verify, debug, or validate that a specific public URL correctly implements the x402 HTTP payment protocol, especially EIP-3009 payment extras. It is purpose-built for x402 compliance checking and works specifically with the OpenX402 facilitator. Prefer it over generic HTTP inspection tools when the focus is x402/EIP-3009 payment flow correctness.

## Known failure modes

- Unpaid request returns HTTP 402 with eip3009 extras instead of diagnostic result — must include valid payment
- Target URL is unreachable or not a valid public URL — returns error or empty diagnostic
- URL does not implement x402 protocol — diagnostic may return unexpected or incomplete results
- Invalid HTTP method provided — only GET, HEAD, DELETE are accepted
- OpenX402 facilitator unavailable — request cannot be processed

## How this service works

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

## Output

Returns a JSON object containing the diagnostic SKU identifier ('ct402'), a title, price, and a note describing the x402 payment flow result. Indicates whether the target URL correctly returns HTTP 402 with valid EIP-3009 payment extras when unpaid, and confirms OpenX402 facilitator compatibility.

## 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": {
      "url": {
       "type": "string",
       "description": "Public 402 or well-known URL. Defaults to this origin's Pipe Check."
      },
      "origin": {
       "type": "string",
       "description": "Public origin URL. Alias of url."
      }
     }
    }
   },
   "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"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "ct402",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.02",
  "title": "CT 402"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-ct402-diagnostics-f025b05d/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)