The FIXSIM MCP server,
connected in one click.
Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances. Connect the official FIXSIM MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add FIXSIM to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http fixsim https://mcp.fixsim.com/mcpRun in your terminal, then restart Claude Code.
FIXSIM · https://mcp.fixsim.com/mcp
What your AI can do with FIXSIM
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “fixsim_list_orders_out”: Orders FIXSIM sent OUT on a session (created with fixsim_send_order). Pass clOrdId to fetch one.”
“Use “sandbox_get_status”: Is the user's FIX engine connected to the sandbox session? Returns state: connected, waiting (nobody logged on yet), disabled, or unknown.”
“Use “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.”
“Use “fixsim_list_orders_in”: Orders the user's trading system sent INTO FIXSIM on a session (FIXSIM is the counterparty). Includes ClOrdID, symbol, side, quantity, remai.”
How secure is the FIXSIM MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how FIXSIM holds up.
Security grade F
gate scanned 21 tools on Sep 16, 2026. A few things are worth a look before you connect.
- mediumfixsim_list_orders_out: References secrets or data exfiltration
- mediumfixsim_send_order: References secrets or data exfiltration
- mediumfixsim_list_orders_in: References secrets or data exfiltration
- +22 more in the full report
Official endpoint
Operated by FIXSIM (fixsim.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If FIXSIM adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick FIXSIM
Choose FIXSIM in the gate directory. No sign-in needed.
Use it anywhere
FIXSIM's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools FIXSIM exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
fixsim_list_orders_out — Orders FIXSIM sent OUT on a session (created with fixsim_send_order). Pass clOrdId to fetch one.
sandbox_get_status — Is the user's FIX engine connected to the sandbox session? Returns state: connected, waiting (nobody logged on yet), disabled, or unknown.
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). Includes ClOrdID, symbol, side, quantity, remai
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 si
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-da
sandbox_set_autofill — Turn automatic fills on or off for a sandbox session. On: every order the user sends is filled immediately at the security's last price. Off
fixsim_cancel_order_out — Have FIXSIM send an Order Cancel Request (35=F) for an order it previously sent out with fixsim_send_order.
+ 13 more tools once connected
Who runs the FIXSIM MCP server?
The FIXSIM MCP server at a glance
https://mcp.fixsim.com/mcpQuestions, answered
Is there an official FIXSIM MCP server?
Yes — FIXSIM operates its own remote MCP server at mcp.fixsim.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect FIXSIM to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick FIXSIM in the directory. No account or sign-in is needed. From then on, FIXSIM's tools are available in every client you've connected to gate.
Do I need to host anything?
No. FIXSIM runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the FIXSIM MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect FIXSIM in minutes. No credit card required.
Connect more than just FIXSIM
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up FIXSIM in: Claude · Claude Code · ChatGPT · Cursor · VS Code