# x402-tools Schema Finger Diagnostic

> x402-tools Schema Finger Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.18/call, status unknown (last checked 2026-10-10).

Returns a paid diagnostic JSON payload demonstrating the x402 payment-gated API pattern with EIP-3009 authorization, via the OpenX402 facilitator.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/schemafinger?utm_source=zero.xyz
- Price: $0.18/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-schema-finger-diagnostic-e1acef82
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W3-Cf10v8IBy2rwbuXppn

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-schema-finger-diagnostic-e1acef82
```

Example prompt: Run the schemafinger diagnostic on the x402 tools endpoint so I can see what a real paid JSON payload looks like after settling $0.18 USDC through OpenX402.

## When to prefer this

Use this endpoint when you need to test, validate, or demonstrate the x402 HTTP payment protocol with EIP-3009 authorization extras in a live environment. It is the right choice when verifying that an x402 client correctly handles 402 responses and successfully settles micropayments through the OpenX402 facilitator. Prefer it over mock or static fixtures when you need a real paid API call to inspect the actual response shape.

## Known failure modes

- HTTP 402 returned with EIP-3009 extras if payment has not been settled — caller must complete x402 micropayment flow first
- Invalid or missing 'properties' parameter may yield an error or empty response
- Facilitator other than OpenX402 will be rejected — only OpenX402 is supported
- Network or upstream errors returning non-JSON or 5xx responses

## How this service works

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

## Output

A JSON object containing the SKU name ('schemafinger'), a human-readable note clarifying this is an example paid shape, the price ('$0.18'), and the title ('Schema Finger'). This represents a confirmed paid diagnostic response demonstrating a successful x402 payment-gated API call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "schemafinger",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.18",
  "title": "Schema Finger"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-schema-finger-diagnostic-e1acef82/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)