# x402-tools NullScore20 Diagnostics

> x402-tools NullScore20 Diagnostics is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).

Returns a paid diagnostic JSON response (nullscore20 SKU) to verify x402 payment flow end-to-end via OpenX402 facilitator

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/nullscore20?utm_source=zero.xyz
- Price: $0.02/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-nullscore20-diagnostics-a9756e18
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NaRH3cnPS5RK7oiDjDsJu

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-nullscore20-diagnostics-a9756e18
```

Example prompt: Run the nullscore20 x402 diagnostic on openclawproductions.com so I can confirm the OpenX402 facilitator payment flow is working end-to-end with a $0.02 USDC test call.

## When to prefer this

Choose this endpoint when you need to verify that an x402 payment-gated API flow works correctly end-to-end, specifically with the OpenX402 facilitator and eip3009-style payment authorization. It is a low-cost ($0.02 USDC) diagnostic stub, not a real data service, so prefer it for integration testing, debugging 402 payment walls, or confirming USDC micropayment settlement rather than for any production data retrieval.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — includes eip3009 challenge extras
- Payment rejected if facilitator is not OpenX402
- Malformed or missing properties parameter may result in unexpected behavior
- USDC balance insufficient to cover $0.02 microtransaction
- Network timeout during payment settlement

## 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 ('nullscore20'), a diagnostic note clarifying this is an example paid response shape, the price ($0.02), and a human-readable title ('Null Score 20'). Unpaid requests receive HTTP 402 with eip3009 payment challenge extras instead.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "nullscore20",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.02",
  "title": "Null Score 20"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-nullscore20-diagnostics-a9756e18/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)