Official MCP server for Paper's trading platform enabling AI coding assistants (Cursor, Claude, and others) to interact with the Paper Trading API. It exposes MCP endpoints to fetch real-time quotes, place simulated orders (market, limit, stop), and inspect portfolios and P&L. The server can be installed globally (npm i -g @paperinvest/mcp-server) or run with npx, with Node.js 16+ recommended. Configure authentication via environment variables: PAPER_API_KEY and optional PAPER_API_BASE_URL to point to the Paper API. IDE integrations are supported: Cursor uses a JSON config at ~/.cursor/mcp.json and Claude Desktop uses claude_desktop_config.json with a 'paper' MCP server entry and the API key. Tools available include paper.quote, paper.quotesBatch, paper.order, and paper.portfolio. Example scripts and configs are in the examples directory, showing prompts to fetch quotes and place orders. Getting started steps include signing up at app.paperinvest.io, generating an API key, configuring the environment, and restarting Claude Desktop or Cursor. Troubleshooting covers PATH issues, ensuring API key is set in the correct environment, connectivity to https://api.paperinvest.io, and restarting clients after config changes. Links to NPM, GitHub, MCP landing, and API docs are provided.