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FIXSIM

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

Connector by GammaThreeTrading · GitHub account verified by the MCP Registry

IndexedMITRemote (HTTP)★ 1
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Install

Works with Claude Code, VS Code, Cursor, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install connector/gammathreetrading-fixsim

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

Remote endpoint

  • https://mcp.fixsim.com/mcp Remote (HTTP)

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About

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

Reviews

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools
13 read · 7 write · 1 delete
Secrets
1 (API keys, tokens or passwords)
Install scripts
Nothing to install (hosted)
Runs as
Hosted (remote endpoint)

Tools by what they do 21

From the running server's own tool list (tools/list) on Oct 25, 2026.

Read 13 · Look things up without changing anything.

  • fixsim_get_order_in
  • fixsim_get_session
  • fixsim_list_executions_in
  • fixsim_list_executions_out
  • fixsim_list_instances
  • fixsim_list_orders_in
  • fixsim_list_orders_out
  • fixsim_list_securities
  • fixsim_list_sessions
  • sandbox_get_messages
  • sandbox_get_orders
  • sandbox_get_session
Show 1 more tools
  • sandbox_get_status

Write 7 · Create, change, send or run things.

  • fixsim_act_on_orders
  • fixsim_cancel_order_out
  • fixsim_send_order
  • fixsim_send_raw_fix
  • sandbox_act_on_order
  • sandbox_create_session
  • sandbox_set_autofill

Delete 1 · Delete, drop, revoke or wipe things.

  • sandbox_end_session

Secrets and settings it asks for

Secrets: values you paste in that let it act as you.

  • x-api-key

Network hosts it talks to 1

  • mcp.fixsim.com · found in remote endpoint, install command

Tools (21)

As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • fixsim_act_on_ordersAct on inbound 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.

  • fixsim_cancel_order_outSend an Order Cancel Request

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

  • fixsim_get_order_inGet inbound orderread-only

    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.

  • fixsim_get_sessionGet FIX sessionread-only

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

  • fixsim_list_executions_inList inbound execution reportsread-only

    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).

  • fixsim_list_executions_outList outbound execution reportsread-only

    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.

  • fixsim_list_instancesList FIXSIM instancesread-only

    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.

  • fixsim_list_orders_inList inbound ordersread-only

    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.

  • fixsim_list_orders_outList outbound ordersread-only

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

  • fixsim_list_securitiesList securitiesread-only

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

  • fixsim_list_sessionsList FIX sessionsread-only

    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.

  • fixsim_send_orderSend a New Order Single

    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.

  • fixsim_send_raw_fixSend raw FIX messages

    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.

  • sandbox_act_on_orderFill, reject, or cancel a sandbox 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.

  • sandbox_create_sessionCreate sandbox FIX 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.

Show 6 more tools
  • sandbox_end_sessionEnd sandbox sessioncan change or delete data

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

  • sandbox_get_messagesRead sandbox FIX message logread-only

    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.

  • sandbox_get_ordersList sandbox ordersread-only

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

  • sandbox_get_sessionGet sandbox sessionread-only

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

  • sandbox_get_statusCheck sandbox connection statusread-only

    Is the user's FIX engine connected to the sandbox session? Returns state: connected, waiting (nobody logged on yet), disabled, or unknown.

  • sandbox_set_autofillSet sandbox auto-fill

    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.

Signals

Stars
1
Forks
0
Open issues
0
Last commit
Sep 13, 2026 (1 month ago)
Last release
Sep 13, 2026 (1 month ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name
io.github.GammaThreeTrading/fixsim
Version
0.1.2
Auth
API key
License
MIT
Repository
github.com/GammaThreeTrading/fixsim-mcp
Website
www.fixsim.com/sandbox
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registrygithub-graphql
Cite this page

FIXSIM MCP server. Agent Mart. https://agentmart.dev/connectors/gammathreetrading-fixsim (last updated 2026-10-24)