Arbiter

Overview

Arbiter is a Model Context Protocol server that analyzes blockchain transactions to determine safety before signing. It decodes transaction data and provides clear guidance—allow, warn, or block—helping AI assistants and users make informed decisions about what they're about to execute on-chain.

The server runs locally via the npm package @arbiterlabs/mcp, which communicates over stdio. Installation uses npx -y @arbiterlabs/mcp and requires the ARBITER_PRIVATE_KEY environment variable for authentication. Version v0.1.1 is available under the MIT license, with source code hosted at godwin105/arbiter_AI on GitHub.

Arbiter is listed in the Development category on mcp.site and integrates with any MCP-compatible client including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain Arbiter, claim this listing to verify ownership and keep the information up to date.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "arbiter": {
      "command": "npx",
      "args": [
        "-y",
        "@arbiterlabs/mcp"
      ],
      "env": {
        "ARBITER_PRIVATE_KEY": "<arbiter-private-key>"
      }
    }
  }
}

Requires ARBITER_PRIVATE_KEY