probe402-check MCP

An open-source MCP server and CLI that allows agents to query probe402's public record about x402 or MPP endpoints before making a payment. It provides pre-payment checks by reading free grade data, verifying archive heads, and wrapping fetch requests to ensure payments are only signed after checking the endpoint's status against the independent measurement layer.

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Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by probe402

Vendor documentation

What you can do with it

Check an x402 endpoint's quote and status before an agent pays it
Verify a published archive head from the terminal
Wrap fetch requests to automatically check 402 responses against the record

Source and maintenance

Community listingRegistry 0.2.1

mcp-registry: io.github.probe402/probe402-check@0.2.1 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:59 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

probe402-check 0.2.1

npmnpx

probe402-check package definition

{
  "version": "0.2.1",
  "transport": "stdio",
  "identifier": "probe402-check",
  "runtimeHint": "npx",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "packageArguments": [
    {
      "type": "positional",
      "value": "--mcp",
      "valueHint": "mcp",
      "isRequired": true,
      "description": "Serve the MCP tool over stdio"
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "probe402-check-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "probe402-check@0.2.1",
        "--mcp"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "probe402-check-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "probe402-check@0.2.1",
        "--mcp"
      ]
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "probe402-check-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "probe402-check@0.2.1",
        "--mcp"
      ]
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "probe402-check-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "probe402-check@0.2.1",
        "--mcp"
      ]
    }
  }
}

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