FIXSIM

Name: FIXSIM
Author: GammaThreeTrading

MCP serverMCP

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

by GammaThreeTradingrepository ↗homepage ↗v0.1.2

Is this yours?

This record is unclaimed

Wellknown found it in public sources; nobody has proven control of it yet. Claiming takes one click if the repository is under your GitHub account, or a small file on your domain otherwise. Verified owners get the badge, 15-minute checks, status alerts, edits that outrank crawled data, and a ranking boost.

Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"fixsim","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.

Claim this record

Observed by Wellknown

Evidence

Everything here was measured by our prober or read from a registry. Nothing is self-reported.

30-day availability95/95 checks ok

when	check	result	http	latency	detail
6 h ago	mcp initialize	ok	200	117 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
12 h ago	mcp initialize	ok	200	127 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
20 h ago	mcp initialize	ok	200	184 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
25 h ago	mcp initialize	ok	200	122 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
32 h ago	mcp initialize	ok	200	117 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
2 d ago	mcp initialize	ok	200	123 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
2 d ago	mcp initialize	ok	200	135 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
2 d ago	mcp initialize	ok	200	105 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
2 d ago	mcp initialize	ok	200	108 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools
3 d ago	mcp initialize	ok	200	290 ms	server fixsim 0.1.2 · protocol 2025-06-18 · 21 tools

Tools observed via MCP handshake

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. Follow up with fixsi
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
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 filt
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 accep
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 a
fixsim_cancel_order_out — Have FIXSIM send an Order Cancel Request (35=F) for an order it previously sent out with fixsim_send_order.
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.
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: Exec
fixsim_get_session — Get one FIX session's settings and live state (logged in?, sequence numbers, connection details).
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
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.
sandbox_get_orders — Working orders the user's engine has sent into the sandbox session: ClOrdID, symbol, side, qty, filled, leaves, price, status.
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 (
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 SenderComp
sandbox_end_session — End a sandbox session now instead of waiting for it to expire. Frees the slot for the user's IP.
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 (Begi
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 nam
fixsim_list_securities — Securities (symbol, last price, CUSIP, ISIN) configured on an instance. FIXSIM prices fills from these.
sandbox_get_session — Re-fetch a sandbox session's connection card by id, including whether auto-fill is on and when it expires.

Provenance

Where this record came from

Every source is kept verbatim. Field changes are logged as events.

Official MCP Registryio.github.GammaThreeTrading/fixsim

first seen 26 d ago · fetched 6 h agoopen ↗

Field history (7 recent events)

26 d ago · declared · summary → "Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances."
26 d ago · declared · description → "Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances."
26 d ago · declared · publisherName → "GammaThreeTrading"
26 d ago · declared · homepageUrl → "https://www.fixsim.com/sandbox"
26 d ago · declared · repoUrl → "https://github.com/GammaThreeTrading/fixsim-mcp"
26 d ago · declared · version → "0.1.2"
26 d ago · declared · protocols → ["mcp"]

FIXSIM

This record is unclaimed

Evidence

What the publisher says

Capabilities

Where this record came from