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Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.
FIXSIM is an MCP server entry in ChatHome Skills, sourced from Official MCP Registry and scored 73/100. As a Model Context Protocol server, it exposes tools that MCP-compatible LLM clients such as Claude, Cursor, and Copilot can call directly, extending an agent's reach beyond its built-in capabilities. ChatHome Skills discovered this entry through its daily ingest of official registries and GitHub discovery queries, and re-verifies repository facts, freshness signals, and install metadata on every run. The quality score weighs official-registry presence, a working install command, license clarity, GitHub star trajectory, and repository freshness — the full formula is on the Sources page. The install command above is ready to copy. Review the last-pushed date and repository status before adding FIXSIM to a production agent workflow; the snapshot facts below are point-in-time values from the most recent ingest.
mcp add io.github.GammaThreeTrading/fixsim https://mcp.fixsim.com/mcpReview the upstream source before running this command.
{
"_meta": {
"io.modelcontextprotocol.registry/official": {
"status": "active",
"isLatest": true,
"updatedAt": "2026-09-13T03:14:07.041606Z",
"publishedAt": "2026-09-13T03:14:07.041606Z",
"statusChangedAt": "2026-09-13T03:14:07.041606Z"
}
},
"server": {
"name": "io.github.GammaThreeTrading/fixsim",
"title": "FIXSIM",
"$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
"remotes": [
{
"url": "https://mcp.fixsim.com/mcp",
"type": "streamable-http",
"headers": [
{
"name": "x-api-key",
"isSecret": true,
"description": "Optional. Your FIXSIM API key (portal.fixsim.com, API Keys). Leave blank to use only the free sandbox tools."
}
]
}
],
"version": "0.1.2",
"repository": {
"url": "https://github.com/GammaThreeTrading/fixsim-mcp",
"source": "github"
},
"websiteUrl": "https://www.fixsim.com/sandbox",
"description": "Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances."
}
}