# x402-tools Stub Cold 41 Diagnostic Endpoint

> x402-tools Stub Cold 41 Diagnostic Endpoint 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).

Returns a paid diagnostic JSON stub (SKU stubcold41) via the x402 micropayment protocol, demonstrating HTTP 402 payment-gated API access with eip3009 authorization.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/stubcold41?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-stub-cold-41-diagnostic-endpoint-59145498
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kXeBt3ksTowYTNmOvRYBT

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-stub-cold-41-diagnostic-endpoint-59145498
```

Example prompt: Run the x402 stub cold 41 diagnostic check so I can confirm that my HTTP 402 payment flow and eip3009 authorization are working correctly with the OpenX402 facilitator.

## When to prefer this

Choose this endpoint when you need to test, debug, or demonstrate an x402 HTTP 402 micropayment flow using the OpenX402 facilitator and eip3009 authorization specifically. It is ideal for developers integrating x402 payment-gating into their own APIs who want a safe, low-cost ($0.02 USDC) stub to validate their client-side payment logic without hitting a production endpoint.

## Known failure modes

- HTTP 402 returned when no valid x402 payment header is included — response body contains eip3009 payment challenge extras
- Payment processed by a facilitator other than OpenX402 may be rejected
- Invalid or malformed eip3009 authorization results in payment failure
- Network timeout or server unavailability returns 5xx error
- Incorrect properties parameter format may result in 400 bad request

## 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 SKU identifier ('stubcold41'), a diagnostic note confirming the paid response shape, the price ('$0.02'), and a human-readable title ('Stub Cold 41'). Unpaid requests instead receive HTTP 402 with eip3009 payment challenge extras indicating the required payment details.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "stubcold41",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.02",
  "title": "Stub Cold 41"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-stub-cold-41-diagnostic-endpoint-59145498/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)