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fixsim-mcp

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fixsim-mcp

An MCP server for FIXSIM, the hosted FIX protocol simulator. Add it to Claude, Cursor, VS Code, or ChatGPT and test FIX from a conversation:

"Create a FIX 4.4 test session for me, then tell me when my engine has logged on and show me the first order it sent."

Two tool families live on one endpoint:

Tools

Who

Auth

sandbox_*

anyone

none. Free, anonymous, 4-hour sessions on the Developer Sandbox

fixsim_*

FIXSIM customers

your FIXSIM API key, sent as an x-api-key header

Connect

Hosted endpoint: https://mcp.fixsim.com/mcp (read-only variant: https://mcp.fixsim.com/mcp/readonly).

Claude Code

claude mcp add --transport http fixsim https://mcp.fixsim.com/mcp --header "x-api-key: YOUR_FIXSIM_API_KEY"

Leave off --header if you only want the free sandbox tools.

Cursor / VS Code (mcp.json)

{
  "mcpServers": {
    "fixsim": {
      "url": "https://mcp.fixsim.com/mcp",
      "headers": { "x-api-key": "YOUR_FIXSIM_API_KEY" }
    }
  }
}

Claude.ai / Claude Desktop: Customize → Connectors → Add custom connector → URL https://mcp.fixsim.com/mcp. Choose authentication None for the sandbox. To use your own instances, add a request header x-api-key (header support in the connector dialog is rolling out; if you do not see it, use Claude Code or Cursor for now).

Related MCP server: FIX MCP Server

Tools

Sandbox (no auth)

Tool

What it does

sandbox_create_session

Provision a free FIX session. Returns host, port, SenderCompID (your tag 49), TargetCompID (tag 56), BeginString, expiry.

sandbox_get_status

Is your engine connected? connected / waiting / disabled.

sandbox_get_messages

The FIX message log, raw and parsed. Pass afterSeq to poll for new messages.

sandbox_get_orders

Working orders your engine sent in.

sandbox_act_on_order

Play the exchange: fill, partial, reject, cancel.

sandbox_set_autofill

Fill every incoming order automatically.

sandbox_get_session

Re-fetch the connection card.

sandbox_end_session

End the session early.

Sandbox limits: 100 application messages per session per day, 4-hour sessions, a handful of sessions per caller.

FIXSIM instances (API key)

Tool

What it does

fixsim_list_instances

Instances your key can access. Start here.

fixsim_list_sessions, fixsim_get_session

Sessions on an instance: FIX version, CompIDs, role, logged-in state, sequence numbers.

fixsim_list_orders_in, fixsim_get_order_in

Orders your system sent into FIXSIM, with raw FIX and audit trail.

fixsim_list_executions_out

Execution reports FIXSIM sent you (acks, fills, rejects). Filter by ClOrdID.

fixsim_list_orders_out, fixsim_list_executions_in

The reverse direction, when FIXSIM is the order sender.

fixsim_list_securities

Symbols and prices on an instance.

fixsim_act_on_orders

Ack, fill, partially fill, reject, cancel, expire… orders your system sent in.

fixsim_send_order

Have FIXSIM send you a New Order Single.

fixsim_cancel_order_out

Have FIXSIM cancel an order it sent.

fixsim_send_raw_fix

Send any raw FIX message on a session.

The /mcp/readonly endpoint exposes the same tools but refuses the ones that send.

Every fixsim_* call is checked against the instances your key is entitled to, and is rate-limited per key (120 calls per minute by default).

Run it yourself

Requires .NET 8.

dotnet run --project src/FixSim.Mcp --urls http://localhost:5199

Configuration (appsettings.json or environment variables such as FixSim__BaseUrl):

Key

Default

Meaning

FixSim:BaseUrl

https://portal.fixsim.com/

The FIXSIM site whose /v1 API the fixsim_* tools call

FixSim:PerKeyCallsPerMinute

120

Per-key rate limit at this server

Sandbox:Enabled

true

Register the sandbox_* tools

Sandbox:BaseUrl

https://sandbox.fixsim.com/

The Developer Sandbox web app

Sandbox:CallerKey

empty

Shared secret sent as X-Sandbox-Caller so the sandbox can trust server-to-server calls

The server is stateless (Streamable HTTP), so it scales horizontally behind any load balancer.

How it works

The server is a thin client. fixsim_* tools call the public FIXSIM REST API (/v1/...) with your key; sandbox_* tools call the Developer Sandbox's session API. Nothing is stored here beyond a one-minute cache of which instances a key may access. Your API key is forwarded to FIXSIM on each call and never logged.

License

MIT

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivityMaintained
ResponsivenessNo issues

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