INDIVIDUAL MCP TOOL

sandbox_create_session

Create a free, anonymous FIX test session on the FIXSIM Developer Sandbox.

fixsim.comnone authenticationAvailability not checked

LIVE ENDPOINT

https://mcp.fixsim.com/mcp/readonly

No auth detected

Connect to this endpoint to inspect the live schema for sandbox_create_session and invoke it with your own arguments.

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Potential side effects detected · medium confidence · heuristic, not a guarantee.

CONNECT WITH APPROVAL

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.fixsim]
url = "https://mcp.fixsim.com/mcp/readonly"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "fixsim": {
      "type": "http",
      "url": "https://mcp.fixsim.com/mcp/readonly"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: fixsim
Remote MCP URL: https://mcp.fixsim.com/mcp/readonly

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "fixsim": {
      "url": "https://mcp.fixsim.com/mcp/readonly"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "fixsim": {
      "type": "http",
      "url": "https://mcp.fixsim.com/mcp/readonly"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "fixsim",
  "transport": "streamable-http",
  "url": "https://mcp.fixsim.com/mcp/readonly"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

fixsim_list_orders_out — Orders FIXSIM sent OUT on a session (created with fixsim_send_order).
sandbox_get_status — Is the user's FIX engine connected to the sandbox session?
fixsim_send_order — Have FIXSIM send a New Order Single (35=D) OUT on a session to the user's system, so they can test how their system handles inbound orders.
fixsim_list_orders_in — Orders the user's trading system sent INTO FIXSIM on a session (FIXSIM is the counterparty).
fixsim_list_executions_in — Execution reports the user's system sent INTO FIXSIM on a session (when FIXSIM is the order sender and the user's system is the executing side).
fixsim_act_on_orders — Respond to orders the user's system sent into FIXSIM: acknowledge, fully or partially execute, reject, cancel remaining, expire, done-for-day, restate, or accept/reject a pending cancel/replace.
sandbox_set_autofill — Turn automatic fills on or off for a sandbox session.
fixsim_cancel_order_out — Have FIXSIM send an Order Cancel Request (35=F) for an order it previously sent out with fixsim_send_order.