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Overview

Claude Desktop supports MCP natively. Once connected, you can ask Claude questions like “What are the most active Polymarket markets right now?” and it will fetch live data from EventGraph in real time.

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Setup

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1. Complete the MCP quickstart

First, create and test your server.js locally:

MCP Quickstart →

Set up the EventGraph MCP server (5 min)

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2. Find your Claude config file

OSPath
macOS~/Library/Application Support/Claude/claude_desktop_config.json
Windows%APPDATA%\Claude\claude_desktop_config.json
If the file doesn’t exist, create it.

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3. Add the EventGraph server

{
  "mcpServers": {
    "eventgraph": {
      "command": "node",
      "args": ["/absolute/path/to/eventgraph-mcp/server.js"],
      "env": {
        "EVENTGRAPH_API_KEY": "eg_live_your_key_here"
      }
    }
  }
}
Replace /absolute/path/to/eventgraph-mcp/server.js with the actual path to your file. On macOS this might be /Users/yourname/eventgraph-mcp/server.js.

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4. Restart Claude Desktop

Fully quit and reopen Claude Desktop. You should see a hammer icon (🔨) in the chat input — click it to confirm the EventGraph tools are listed.

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Try it out

Open a new Claude conversation and ask: 
What prediction markets are active right now related to the US economy?

Find arbitrage opportunities between Polymarket and Kalshi.

Show me the price history for the most traded market this week.
Claude will automatically call the right EventGraph tool, fetch live data, and incorporate it into its response.

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Troubleshooting

  1. Make sure you fully quit Claude (not just close the window) — use Cmd+Q on Mac
  2. Check the config file path is correct and valid JSON
  3. Verify Node.js is installed: node --version
  4. Check the absolute path to server.js has no typos
  1. Open Claude Desktop logs: Help → Show Logs
  2. Look for errors from the eventgraph server
  3. Make sure EVENTGRAPH_API_KEY is your actual key starting with eg_live_
  4. Test the key directly: curl https://app.eventgraph.ai/api/v1/status -H "X-API-Key: YOUR_KEY"
The find_arbitrage, compare_markets, and get_market_history tools require a Pro API key. Upgrade here →

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Example conversation

You: What are the biggest prediction markets by volume right now? Claude: [calls search_markets with sort=volume] Here are the top markets by volume across all platforms:
  1. Will the Fed cut rates in June 2026? — Polymarket — 67% Yes — $2.4M volume
  2. 2026 US House majority — Kalshi — 54% Republican — $1.8M volume
  3. …
Claude remembers the context across tool calls in a conversation. You can ask follow-up questions like “How has that first market moved over the last week?” and Claude will call get_market_history automatically.