Polymarket Kalshi Arbitrage

MCP server · by oddsrail

AI Agents Python v0.10.0

Cross-venue prediction markets for AI agents: Polymarket + Kalshi, costed and attributed

View source ↗ Generate config for multiple servers More servers

Install

Pin version registry version 0.10.0

Python
uvx oddsrail

Python
uvx oddsrail@0.10.0

Setup by client

Pick your client — the config below is generated for this server (local stdio). Copy respects the “Pin version” switch above.

claude_desktop_config.json

{
  "mcpServers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

{
  "mcpServers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail@0.10.0"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

Format verified against the official Claude Desktop docs ↗.

terminal

claude mcp add --env POLYMARKET_PRIVATE_KEY=<YOUR_POLYMARKET_PRIVATE_KEY> polymarket-kalshi-arbitrage -- uvx oddsrail

claude mcp add --env POLYMARKET_PRIVATE_KEY=<YOUR_POLYMARKET_PRIVATE_KEY> polymarket-kalshi-arbitrage -- uvx oddsrail@0.10.0

Format verified against the official Claude Code docs ↗.

.cursor/mcp.json

{
  "mcpServers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

{
  "mcpServers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail@0.10.0"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

Format verified against the official Cursor docs ↗.

.vscode/mcp.json

{
  "servers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

{
  "servers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail@0.10.0"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

Format verified against the official VS Code docs ↗.

mcp_config.json

{
  "mcpServers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

{
  "mcpServers": {
    "polymarket-kalshi-arbitrage": {
      "command": "uvx",
      "args": [
        "oddsrail@0.10.0"
      ],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "<YOUR_POLYMARKET_PRIVATE_KEY>"
      }
    }
  }
}

Format verified against the official Windsurf docs ↗.

Environment variables

Defined in the server's official registry manifest. Required secrets are shown as <YOUR_…> placeholders in the configs above.

ODDSRAIL_DRY_RUN — 1 (default) simulates orders; 0 enables real trading
ODDSRAIL_BUILDER_CODE — bytes32 Polymarket builder code for on-chain attribution
POLYMARKET_PRIVATE_KEY secret — operator wallet key; only needed for real trading
POLYMARKET_WALLET_ADDRESS — proxy/deposit wallet address, if used

GitHub

⭐ 1 stars · 最近更新于 22 天前 · MIT license

These star and push figures are for the shared repository — 4 listings on this site point at the same repository.

About this server

oddsrail Give your AI agent Polymarket tools, with local signing and spending limits. If oddsrail is useful to you, a ⭐ on this repo helps other people find it. oddsrail is an open-source MCP server. It gives Claude, Cursor or any MCP client live market data, costed fills and order routing on Polyma…

Summary from the project README — github.com/hmesutozsoy/oddsrail

Distributed as Python, listed under AI Agents. Review our MCP security guide before granting access to real data.

Frequently asked questions

What does the Polymarket Kalshi Arbitrage MCP server do?

How do I install Polymarket Kalshi Arbitrage?

Run the install command shown above, then paste the config for your client (Claude Desktop, Claude Code, Cursor, VS Code or Windsurf) into its MCP settings and restart the client.

Is Polymarket Kalshi Arbitrage free to use?

The MCP server itself is free to install. The source is public on https://github.com/hmesutozsoy/oddsrail. Any third-party service it calls may require its own API key and account.

Which clients support Polymarket Kalshi Arbitrage?

Any MCP-compatible client can use it, including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf and custom agents.

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