MCP MeasureMCP Measure

index observed

x402 endpoint checker

Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.

Should I use this

Quality & Safety

A
Description quality
100%
Schema completeness
100%
Naming quality
100%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~165Tokens (tool definitions)
~810 BTypical response size
Minimal attention impact (0.13% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "x402-checker": {
      "url": "https://x402-seller-kit.soloearn.workers.dev/mcp"
    }
  }
}

Remote endpoints

https://x402-seller-kit.soloearn.workers.dev/mcpstreamable-http

What it can do

Tool inventory

Tools (1)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢check_x402_endpoint(url, method)

Fetch a paid URL without paying and grade its x402 402 challenge: status, PAYMENT-REQUIRED header, version, network, USDC asset, amount units, payTo checksum, EIP-712 domain, CORS, HEAD parity and discovery metadata. Read-only; never signs or pays.

Input Schema

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string",
      "description": "Full http(s) URL of the paid endpoint"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET",
        "POST"
      ],
      "description": "HTTP method the endpoint expects (default GET)"
    }
  },
  "required": [
    "url"
  ],
  "additionalProperties": false
}

Community

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Evidence

Recent observations

verifiedversion not recorded1 tools