# x402-tools U-3 Source Diagnostic

> x402-tools U-3 Source Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-11).

Returns a paid diagnostic JSON payload for the U-3 Source SKU, gated behind x402 HTTP payment flow with EIP-3009 authorization; unpaid requests receive HTTP 402.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/u3src?utm_source=zero.xyz
- Price: $0.04/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-u-3-source-diagnostic-80a21978
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W10JkRv2KkSZdHaPyMJKA

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-u-3-source-diagnostic-80a21978
```

Example prompt: Run the x402 U-3 Source diagnostic on OpenX402 and show me the paid JSON response after settling the $0.04 USDC payment — I want to confirm the EIP-3009 payment gating is working correctly.

## When to prefer this

Choose this endpoint when you need to test or demonstrate the x402 micropayment protocol with EIP-3009 authorization, specifically with the OpenX402 facilitator. It is purpose-built for diagnosing x402 payment gating behavior — not for production data retrieval. Prefer it over other x402 test endpoints when you specifically need the U-3 Source SKU shape or want to validate OpenX402 facilitator compatibility at a $0.04 USDC price point.

## Known failure modes

- HTTP 402 returned when no valid EIP-3009 payment authorization is included in the request
- Payment authorization rejected if wrong facilitator (non-OpenX402) is used
- Malformed properties parameter may yield unexpected behavior given minimal schema definition
- Network timeout if x402 payment settlement takes too long
- Invalid USDC token transfer signature causes payment rejection

## 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 ('u3src'), a diagnostic note clarifying this is an example paid shape, the price ('$0.04'), and the title ('U-3 Source'). Unpaid or unauthenticated requests return HTTP 402 with EIP-3009 payment challenge extras specifying the required USDC micropayment and facilitator details.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "u3src",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.04",
  "title": "U-3 Source"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-u-3-source-diagnostic-80a21978/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)