Polymarket Kalshi Trading vs Simmer

In-depth architectural comparison of the Polymarket Kalshi Trading and Simmer MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Polymarket Kalshi Trading when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Polymarket Kalshi Trading Details

Choose Simmer when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Simmer Details

Feature & Specification Comparison

Specification	Polymarket Kalshi Trading Developer Tools	Simmer Developer Tools
Summary	Cross-venue prediction markets for AI agents: Polymarket + Kalshi, costed and attributed	Trade prediction markets with AI agents — skill discovery, autoresearch, and execution.
Category & Scope	Developer Tools	Developer Tools

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "polymarket-kalshi-trading": {
      "command": "uvx",
      "args": [
        "oddsrail"
      ]
    }
  }
}

{
  "mcpServers": {
    "simmer": {
      "command": "uvx",
      "args": [
        "simmer-sdk"
      ]
    }
  }
}

Related MCP Server Comparisons