Claude Desktop

FIXSIM for Claude Desktop

io.github.gammathreetrading/fixsim

Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.

client:Claude Desktop transport:streamable-http tools:21

Install FIXSIM in Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json · windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "fixsim": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://mcp.fixsim.com/mcp"
      ]
    }
  }
}

Claude Desktop has no remote transport in its config file, so this bridges through mcp-remote. Restart the app after saving. Claude Desktop docs

What Claude Desktop can do once it is connected

FIXSIM in other clients

FIXSIM MCP server