# x402-tools RailPick Diagnostics

> x402-tools RailPick Diagnostics is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Returns paid x402 diagnostics for a specified HTTP request type via the /api/v1/railpick endpoint, gated by EIP-3009 micropayment (0.01 USDC); unpaid requests receive HTTP 402 with payment details.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/railpick?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-railpick-diagnostics-d9b22648
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1ZwUf6iYUuXyFJtjZD1AK

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-railpick-diagnostics-d9b22648
```

Example prompt: Run a GET-type x402 diagnostic on the railpick endpoint and show me the full response — I want to see what the payment challenge looks like if I haven't paid yet.

## When to prefer this

Choose this endpoint when you need to test, diagnose, or validate x402 protocol behavior — specifically the HTTP 402 payment challenge and EIP-3009 micropayment flow using the OpenX402 facilitator. Ideal for developers building x402-compatible clients or agents that need to handle USDC micropayment-gated APIs. Prefer this over general HTTP testing tools when your goal involves verifying x402 payment wall responses or EIP-3009 challenge formats.

## Known failure modes

- HTTP 402 returned when no valid EIP-3009 payment token is included — response body contains payment challenge details
- Invalid or unsupported HTTP method in the 'method' field returns a validation error
- Missing required 'type' or 'method' fields in the input object causes a schema validation failure
- OpenX402 facilitator unavailable may cause payment verification to fail
- Malformed request body results in 400-level error

## How this service works

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

## Output

On successful (paid) requests: diagnostic data about the x402 endpoint response. On unpaid requests: HTTP 402 status with EIP-3009 payment challenge extras including payment amount, token, network, and facilitator details required to authorize a 0.01 USDC micropayment via OpenX402.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE",
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object"
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  },
  "inputSchema": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-railpick-diagnostics-d9b22648/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)