FIXSIM

{
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "name": "io.github.GammaThreeTrading/fixsim",
  "description": "Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.",
  "title": "FIXSIM",
  "repository": {
    "url": "https://github.com/GammaThreeTrading/fixsim-mcp",
    "source": "github"
  },
  "version": "0.1.2",
  "websiteUrl": "https://www.fixsim.com/sandbox",
  "remotes": [
    {
      "type": "streamable-http",
      "url": "https://mcp.fixsim.com/mcp",
      "headers": [
        {
          "description": "Optional. Your FIXSIM API key (portal.fixsim.com, API Keys). Leave blank to use only the free sandbox tools.",
          "isSecret": true,
          "name": "x-api-key"
        }
      ]
    }
  ]
}