FIXSIM for Grok
io.github.gammathreetrading/fixsim
Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.
client:Grok
transport:streamable-http
tools:21
Install FIXSIM in Grok
.mcp.json (in your project root)
{
"mcpServers": {
"fixsim": {
"type": "http",
"url": "https://mcp.fixsim.com/mcp"
}
}
}Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs
What Grok can do once it is connected
- fixsim_list_orders_out
- sandbox_get_status
- fixsim_send_order
- fixsim_list_orders_in
- fixsim_list_executions_in
- fixsim_act_on_orders
- sandbox_set_autofill
- fixsim_cancel_order_out
- fixsim_list_sessions
- fixsim_list_executions_out
- fixsim_get_session
- sandbox_act_on_order
- fixsim_get_order_in
- sandbox_get_orders
- sandbox_get_messages
- sandbox_create_session
- sandbox_end_session
- fixsim_send_raw_fix
- fixsim_list_instances
- fixsim_list_securities
- sandbox_get_session