# x402-tools Model Pick Diagnostic

> x402-tools Model Pick Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-11).

Returns a paid diagnostic JSON payload demonstrating the x402 HTTP payment protocol with EIP-3009 authorization flow for the 'modelpick' SKU.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/modelpick?utm_source=zero.xyz
- Price: $0.03/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-model-pick-diagnostic-7dc8e095
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gWt9GtJKLagFHbX39qPOc

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-model-pick-diagnostic-7dc8e095
```

Example prompt: Can you run the x402 modelpick diagnostic against the OpenX402 facilitator and confirm whether my EIP-3009 payment authorization goes through and returns the paid JSON payload?

## When to prefer this

Use this endpoint when you need to test, validate, or demonstrate the x402 HTTP payment protocol with EIP-3009 authorization flow specifically against the OpenX402 facilitator. It is ideal for developers integrating x402 into their agent wallets, verifying micropayment infrastructure, or debugging 402 challenge/response mechanics. Not appropriate for production data retrieval or AI model selection use cases.

## Known failure modes

- HTTP 402 returned when no valid x402 payment header is provided — includes EIP-3009 challenge extras
- Payment rejected by OpenX402 facilitator if authorization signature is malformed or expired
- Incorrect facilitator used (only OpenX402 is supported; other facilitators will fail)
- Insufficient USDC balance causes payment authorization to be rejected
- Network or RPC issues preventing on-chain payment verification

## How this service works

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

## Output

On successful payment, returns a JSON object with fields: sku ('modelpick'), note (diagnostic message), price ('$0.03'), and title ('Model Pick'). On unpaid or failed payment attempts, returns HTTP 402 with EIP-3009 payment requirement extras in the response headers/body, indicating what authorization is needed.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "modelpick",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.03",
  "title": "Model Pick"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-model-pick-diagnostic-7dc8e095/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)