FIXSIM

Official21 toolsLive

by GammaThreeTrading · C#

Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.

io.github.GammaThreeTrading/fixsim MCP Server (Model Context Protocol)

The io.github.GammaThreeTrading/fixsim MCP server provides a way to run and use test FIX sessions. Its description states it supports “free sandbox FIX sessions” and also allows using “your own FIXSIM instances” for testing.

🛠️ Key Features

Test FIX sessions
Free sandbox FIX sessions
Support for your own FIXSIM instances

🚀 Use Cases

Testing FIX messages
Running sandbox FIX sessions
Testing with self-hosted FIXSIM instances

⚡ Developer Benefits

Reusable FIX testing environment
Option to use sandbox sessions or external FIXSIM instances

⚠️ Limitations

Limited details available beyond FIX testing and FIXSIM usage

Topics

claudefixfix-protocolmcpmcp-serversimulatortestingtradingchatgpt

Captured live from the server via tools/list.

fixsim_list_orders_out

Orders FIXSIM sent OUT on a session (created with fixsim_send_order). Pass clOrdId to fetch one.

Parameters5

instance	string	required
session	string	required
clOrdId	string \| null	optional
limit	integer	optional	Max rows to return, newest first (default 25, max 200)
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "clOrdId": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    },
    "limit": {
      "description": "Max rows to return, newest first (default 25, max 200)",
      "type": "integer",
      "default": 25
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session"
  ]
}

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.

Parameters1

sessionId

string

required

Raw schema

{
  "type": "object",
  "properties": {
    "sessionId": {
      "type": "string",
      "format": "uuid"
    }
  },
  "required": [
    "sessionId"
  ]
}

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. Follow up with fixsim_list_orders_out and fixsim_list_executions_in to see what came back.

Parameters10

instance	string	required
session	string	required
clOrdId	string	required	ClOrdID (tag 11) to assign; must be unique on the session
symbol	string	required	Symbol (tag 55)
side	string	required	Side (tag 54): 1=Buy, 2=Sell, 5=Sell short
orderQty	number	required	OrderQty (tag 38)
ordType	string	required	OrdType (tag 40): 1=Market, 2=Limit
price	number \| null	optional	Price (tag 44), required for limit orders
additionalTags	array \| null	optional	Extra FIX tags, e.g. [{tag:59,value:"0"}]
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "clOrdId": {
      "description": "ClOrdID (tag 11) to assign; must be unique on the session",
      "type": "string"
    },
    "symbol": {
      "description": "Symbol (tag 55)",
      "type": "string"
    },
    "side": {
      "description": "Side (tag 54): 1=Buy, 2=Sell, 5=Sell short",
      "type": "string"
    },
    "orderQty": {
      "description": "OrderQty (tag 38)",
      "type": "number"
    },
    "ordType": {
      "description": "OrdType (tag 40): 1=Market, 2=Limit",
      "type": "string"
    },
    "price": {
      "description": "Price (tag 44), required for limit orders",
      "type": [
        "number",
        "null"
      ],
      "default": null
    },
    "additionalTags": {
      "description": "Extra FIX tags, e.g. [{tag:59,value:\"0\"}]",
      "type": [
        "array",
        "null"
      ],
      "items": {
        "type": [
          "object",
          "null"
        ],
        "properties": {
          "tag": {
            "type": "integer"
          },
          "value": {
            "type": [
              "string",
              "null"
            ]
          }
        },
        "required": [
          "tag",
          "value"
        ]
      },
      "default": null
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session",
    "clOrdId",
    "symbol",
    "side",
    "orderQty",
    "ordType"
  ]
}

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, remaining quantity, order status and the raw FIX message. Optionally filter by FIX OrdStatus code (tag 39): 0 new, 1 partially filled, 2 filled, 4 canceled, 8 rejected.

Parameters5

instance	string	required
session	string	required
orderStatus	string \| null	optional	Optional FIX OrdStatus (tag 39) filter
limit	integer	optional	Max rows to return, newest first (default 25, max 200)
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "orderStatus": {
      "description": "Optional FIX OrdStatus (tag 39) filter",
      "type": [
        "string",
        "null"
      ],
      "default": null
    },
    "limit": {
      "description": "Max rows to return, newest first (default 25, max 200)",
      "type": "integer",
      "default": 25
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session"
  ]
}

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). Optionally filter by ExecID (tag 17).

Parameters5

instance	string	required
session	string	required
execId	string \| null	optional	Optional ExecID (tag 17) filter
limit	integer	optional	Max rows to return, newest first (default 25, max 200)
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "execId": {
      "description": "Optional ExecID (tag 17) filter",
      "type": [
        "string",
        "null"
      ],
      "default": null
    },
    "limit": {
      "description": "Max rows to return, newest first (default 25, max 200)",
      "type": "integer",
      "default": 25
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session"
  ]
}

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. FIXSIM emits the matching execution reports on the FIX session. Give one or more ClOrdIDs; for executions supply lastPx and, for a partial, lastQty.

Parameters7

instance	string	required
session	string	required
action	string	required	One of: Ack, FullyExecute, PartialExecute, CancelRemaining, DoneForDay, AckCancelOrdReplaceReq, AcceptCancelOrdReplaceReq, RejectCancelOrdReplaceReq, Reject, Delete, Restate, Expire
clOrdIds	array	required	ClOrdIDs (tag 11) of the inbound orders to act on
lastPx	number \| null	optional	Fill price (LastPx) for executions
lastQty	number \| null	optional	Fill quantity (LastQty) for a partial execution
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "action": {
      "description": "One of: Ack, FullyExecute, PartialExecute, CancelRemaining, DoneForDay, AckCancelOrdReplaceReq, AcceptCancelOrdReplaceReq, RejectCancelOrdReplaceReq, Reject, Delete, Restate, Expire",
      "type": "string"
    },
    "clOrdIds": {
      "description": "ClOrdIDs (tag 11) of the inbound orders to act on",
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "lastPx": {
      "description": "Fill price (LastPx) for executions",
      "type": [
        "number",
        "null"
      ],
      "default": null
    },
    "lastQty": {
      "description": "Fill quantity (LastQty) for a partial execution",
      "type": [
        "number",
        "null"
      ],
      "default": null
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session",
    "action",
    "clOrdIds"
  ]
}

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 (default): orders are acknowledged and wait for sandbox_act_on_order.

Parameters2

sessionId	string	required
enabled	boolean	required

Raw schema

{
  "type": "object",
  "properties": {
    "sessionId": {
      "type": "string",
      "format": "uuid"
    },
    "enabled": {
      "type": "boolean"
    }
  },
  "required": [
    "sessionId",
    "enabled"
  ]
}

fixsim_cancel_order_out

Have FIXSIM send an Order Cancel Request (35=F) for an order it previously sent out with fixsim_send_order.

Parameters6

instance	string	required
session	string	required
clOrdId	string	required	ClOrdID of the order to cancel (becomes OrigClOrdID, tag 41)
newClOrdId	string \| null	optional	New ClOrdID for the cancel request (tag 11); generated if omitted
additionalTags	array \| null	optional
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "clOrdId": {
      "description": "ClOrdID of the order to cancel (becomes OrigClOrdID, tag 41)",
      "type": "string"
    },
    "newClOrdId": {
      "description": "New ClOrdID for the cancel request (tag 11); generated if omitted",
      "type": [
        "string",
        "null"
      ],
      "default": null
    },
    "additionalTags": {
      "type": [
        "array",
        "null"
      ],
      "items": {
        "type": [
          "object",
          "null"
        ],
        "properties": {
          "tag": {
            "type": "integer"
          },
          "value": {
            "type": [
              "string",
              "null"
            ]
          }
        },
        "required": [
          "tag",
          "value"
        ]
      },
      "default": null
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session",
    "clOrdId"
  ]
}

fixsim_list_sessions

List the FIX sessions on an instance with their FIX version, CompIDs, acceptor/initiator role, host/port, enabled and logged-in state, and sequence numbers.

Parameters2

instance	string	required	Instance name from fixsim_list_instances
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "description": "Instance name from fixsim_list_instances",
      "type": "string"
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance"
  ]
}

fixsim_list_executions_out

Execution reports FIXSIM sent OUT on a session (acks, fills, partial fills, rejects, cancels). Pass clOrdId to see the full execution history of one order: ExecType, OrdStatus, LastPx/LastQty, CumQty, LeavesQty, AvgPx and the raw FIX.

Parameters5

instance	string	required
session	string	required
clOrdId	string \| null	optional	Optional ClOrdID (tag 11) to narrow to one order
limit	integer	optional	Max rows to return, newest first (default 25, max 200)
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "clOrdId": {
      "description": "Optional ClOrdID (tag 11) to narrow to one order",
      "type": [
        "string",
        "null"
      ],
      "default": null
    },
    "limit": {
      "description": "Max rows to return, newest first (default 25, max 200)",
      "type": "integer",
      "default": 25
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session"
  ]
}

fixsim_get_session

Get one FIX session's settings and live state (logged in?, sequence numbers, connection details).

Parameters3

instance	string	required
session	string	required	Session name from fixsim_list_sessions
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "description": "Session name from fixsim_list_sessions",
      "type": "string"
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session"
  ]
}

sandbox_act_on_order

Play the exchange for one order the user sent in: fill (full execution), partial (partial fill), reject, or cancel (cancel the remaining quantity). FIXSIM sends the matching execution report back to the user's engine.

Parameters3

sessionId	string	required
clOrdId	string	required	ClOrdID (tag 11) of the order
action	string	required	fill, partial, reject or cancel

Raw schema

{
  "type": "object",
  "properties": {
    "sessionId": {
      "type": "string",
      "format": "uuid"
    },
    "clOrdId": {
      "description": "ClOrdID (tag 11) of the order",
      "type": "string"
    },
    "action": {
      "description": "fill, partial, reject or cancel",
      "type": "string"
    }
  },
  "required": [
    "sessionId",
    "clOrdId",
    "action"
  ]
}

fixsim_get_order_in

Get one inbound order by ClOrdID (tag 11), including its raw FIX message and audit trail. Use this to explain why an order was rejected or what state it is in.

Parameters4

instance	string	required
session	string	required
clOrdId	string	required	ClOrdID, FIX tag 11
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "clOrdId": {
      "description": "ClOrdID, FIX tag 11",
      "type": "string"
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session",
    "clOrdId"
  ]
}

sandbox_get_orders

Working orders the user's engine has sent into the sandbox session: ClOrdID, symbol, side, qty, filled, leaves, price, status.

Parameters1

sessionId

string

required

Raw schema

{
  "type": "object",
  "properties": {
    "sessionId": {
      "type": "string",
      "format": "uuid"
    }
  },
  "required": [
    "sessionId"
  ]
}

sandbox_get_messages

The FIX message log for a sandbox session, oldest first: logons, heartbeats, orders in, execution reports out, rejects. Each message has seq, timeUtc, inbound (true = user's engine sent it), msgType, raw FIX, and parsed tag/value fields. Pass afterSeq (the last seq you saw) to fetch only new messages. Use this to explain what happened on the wire.

Parameters2

sessionId	string	required
afterSeq	integer	optional	Return only messages with seq greater than this

Raw schema

{
  "type": "object",
  "properties": {
    "sessionId": {
      "type": "string",
      "format": "uuid"
    },
    "afterSeq": {
      "description": "Return only messages with seq greater than this",
      "type": "integer",
      "default": 0
    }
  },
  "required": [
    "sessionId"
  ]
}

sandbox_create_session

Create a free, anonymous FIX test session on the FIXSIM Developer Sandbox. No account or API key needed. Returns the connection card: host, port, the SenderCompID the user must put in tag 49, the TargetCompID for tag 56, BeginString, and the expiry (sessions last 4 hours, cap 100 application messages per day). The user's FIX engine connects as the initiator; FIXSIM is the acceptor and acknowledges every order. Keep the returned id; every other sandbox tool needs it.

Parameters1

fixVersion

string

optional

FIX.4.0, FIX.4.2, FIX.4.4 (default) or FIX.5.0SP2 (rides FIXT.1.1)

Raw schema

{
  "type": "object",
  "properties": {
    "fixVersion": {
      "description": "FIX.4.0, FIX.4.2, FIX.4.4 (default) or FIX.5.0SP2 (rides FIXT.1.1)",
      "type": "string",
      "default": "FIX.4.4"
    }
  }
}

sandbox_end_session

End a sandbox session now instead of waiting for it to expire. Frees the slot for the user's IP.

Parameters1

sessionId

string

required

Raw schema

{
  "type": "object",
  "properties": {
    "sessionId": {
      "type": "string",
      "format": "uuid"
    }
  },
  "required": [
    "sessionId"
  ]
}

fixsim_send_raw_fix

Send one or more raw FIX application messages OUT on a session as given (tag=value pairs separated by | or SOH). FIXSIM supplies the session header fields (BeginString, CompIDs, MsgSeqNum, SendingTime) and the checksum. Use for message types the other tools do not cover.

Parameters4

instance	string	required
session	string	required
fixMessages	array	required	Raw FIX messages, e.g. 35=D\|11=ORD1\|55=IBM\|54=1\|38=100\|40=2\|44=150.25\|59=0
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "session": {
      "type": "string"
    },
    "fixMessages": {
      "description": "Raw FIX messages, e.g. 35=D|11=ORD1|55=IBM|54=1|38=100|40=2|44=150.25|59=0",
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance",
    "session",
    "fixMessages"
  ]
}

fixsim_list_instances

List the FIXSIM instances your API key can access. An instance is a hosted FIX engine; each holds one or more FIX sessions. Start here to learn the instance names other tools need.

Parameters1

apiKey

string | null

optional

FIXSIM API key. Omit when the connector sends it as a header.

Raw schema

{
  "type": "object",
  "properties": {
    "apiKey": {
      "description": "FIXSIM API key. Omit when the connector sends it as a header.",
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  }
}

fixsim_list_securities

Securities (symbol, last price, CUSIP, ISIN) configured on an instance. FIXSIM prices fills from these.

Parameters2

instance	string	required
apiKey	string \| null	optional

Raw schema

{
  "type": "object",
  "properties": {
    "instance": {
      "type": "string"
    },
    "apiKey": {
      "type": [
        "string",
        "null"
      ],
      "default": null
    }
  },
  "required": [
    "instance"
  ]
}

sandbox_get_session

Re-fetch a sandbox session's connection card by id, including whether auto-fill is on and when it expires.

Parameters1

sessionId

string

required

Session id from sandbox_create_session

Raw schema

{
  "type": "object",
  "properties": {
    "sessionId": {
      "description": "Session id from sandbox_create_session",
      "type": "string",
      "format": "uuid"
    }
  },
  "required": [
    "sessionId"
  ]
}

README.md5 KBView on GitHub

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

bash

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)

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).

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.

bash

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

Install

Tools (21)

fixsim_list_orders_outsandbox_get_statusfixsim_send_orderfixsim_list_orders_infixsim_list_executions_infixsim_act_on_orderssandbox_set_autofillfixsim_cancel_order_out

Remote endpoint

Streamable HTTP

Hosted server - connect over the network, no local install.

url

https://mcp.fixsim.com/mcp

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "fixsim": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://mcp.fixsim.com/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.

io.github.GammaThreeTrading/fixsim MCP Server (Model Context Protocol)

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

Topics

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

fixsim-mcp

Connect

Tools

Sandbox (no auth)

FIXSIM instances (API key)

Run it yourself

How it works

License

Install

Remote endpoint

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