Countersign MCP Server

Name: Countersign MCP Server
Author: io.github.countersign-network

io.github.countersign-network/countersign

Repository Registry

What is the Countersign MCP server?

Kill switch + spend guard for AI agents that spend money, across every wallet vendor at once.

How to install Countersign

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

COUNTERSIGN_URL
required
Base URL of the Countersign Core to govern (hosted or self-hosted).
COUNTERSIGN_API_KEY
required
secret
API key for the Core (self-serve one at https://app.countersign.network/start or POST /signup).

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "countersign": {
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "<YOUR_COUNTERSIGN_URL>",
        "COUNTERSIGN_API_KEY": "<YOUR_COUNTERSIGN_API_KEY>"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "countersign": {
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "<YOUR_COUNTERSIGN_URL>",
        "COUNTERSIGN_API_KEY": "<YOUR_COUNTERSIGN_API_KEY>"
      }
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "countersign": {
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "<YOUR_COUNTERSIGN_URL>",
        "COUNTERSIGN_API_KEY": "<YOUR_COUNTERSIGN_API_KEY>"
      }
    }
  }
}

VS Code

.vscode/mcp.json

{
  "servers": {
    "countersign": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "<YOUR_COUNTERSIGN_URL>",
        "COUNTERSIGN_API_KEY": "<YOUR_COUNTERSIGN_API_KEY>"
      }
    }
  }
}

Claude Code

claude mcp add countersign --env COUNTERSIGN_URL=<YOUR_COUNTERSIGN_URL> --env COUNTERSIGN_API_KEY=<YOUR_COUNTERSIGN_API_KEY> -- npx -y @countersign/mcp