# x402-tools List Check

> x402-tools List Check 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).

Probes a public origin URL to diagnose its x402 payment-gating configuration and returns diagnostic details including EIP-3009 payment extras.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/listcheck?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-list-check-2eb1536a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WtVQspyOuHn2M3IUBLbLq

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-list-check-2eb1536a
```

Example prompt: Can you run an x402 listcheck diagnostic on https://example.com to see if it's properly payment-gated and what EIP-3009 payment details it returns?

## When to prefer this

Use this endpoint when you need to programmatically diagnose or verify that a remote origin URL is correctly configured for x402 payment gating, especially when you need to inspect EIP-3009 payment extras. Prefer this over manual curl inspection when you need structured JSON output about the payment requirements of an endpoint.

## Known failure modes

- Origin URL is not reachable — connection timeout or DNS failure
- Origin does not implement x402 — no 402 response returned, empty or unexpected diagnostic
- Malformed origin parameter — missing or invalid URL format
- Payment not provided — this endpoint itself costs $0.02 USDC per call via x402; unpaid requests return HTTP 402
- Origin URL returns 402 but lacks valid EIP-3009 extras — partial diagnostic returned

## How this service works

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

## Output

A JSON diagnostic report describing the x402 payment-gate status of the probed origin URL, including HTTP 402 response details, EIP-3009 payment extras, required payment SKUs, and facilitator information (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": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "origin": {
       "type": "string",
       "description": "Public origin URL to probe"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  },
  "inputSchema": {
   "type": "object",
   "required": [
    "type",
    "properties"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "object"
    },
    "required": {
     "type": "array",
     "items": {
      "type": "string"
     }
    },
    "properties": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "listcheck",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.02",
  "title": "List Check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-list-check-2eb1536a/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)