Uptime (30d)%100.0

Latency (p50)772 msfaster than 23% of servers

Protocol eradual

Tools21

FIXSIM

Description

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

What our measurements say

FIXSIM is a remote MCP server published at mcp.fixsim.com. It has been probed 5 times since 9/13/2026. It answered in 5 of them (100.0%), a near-uninterrupted record. Median response time is 772 ms, a delay an agent will notice. It exposes a broad tool surface of 21 tools. On the protocol side it speaks the 2026-07-28 stateless spec.

Dual-era2026-07-28 ✓Website ↗Version: 0.1.2First probe: 2026-09-13 04:35:29Last probe: 2026-09-13 12:47:19

Agent readability score

Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.

Agent readability score

No AI summary has been generated for this server yet. Summaries are prepared on request — ask for one and it will appear on this page within a few minutes.

Event narrative

Raw observations

Run	Era	Modern	ms	Legacy	ms	Versions
2026-09-13 12:47:19	Dual-era	200	740	200	698	2026-07-28
2026-09-13 10:45:14	Dual-era	200	791	200	772	2026-07-28
2026-09-13 08:43:04	Dual-era	200	836	200	807	2026-07-28
2026-09-13 06:40:42	Dual-era	200	775	200	735	2026-07-28
2026-09-13 04:35:29	Dual-era	200	661	200	660	2026-07-28

Supported versions

2026-07-28

as declared by server/discover + initialize

Capabilities

logging, tools

Schema score

100

21 tools

Schema compliance

tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.

100/100

Excellent21 tools

tools/list schema valid
inputSchema is valid JSON Schema
Smoke test not run this round
Cold-start: cold 156ms → warm 120ms (penalty 36ms)

Tools

Tools the server advertised in the latest measurement — measured, not catalog-claimed.

fixsim_list_orders_out5 params · 2 required
Orders FIXSIM sent OUT on a session (created with fixsim_send_order). Pass clOrdId to fetch one.
- instancestringrequired
- sessionstringrequired
- clOrdIdstring
- limitinteger
- apiKeystring
sandbox_get_status1 param · 1 required
Is the user's FIX engine connected to the sandbox session? Returns state: connected, waiting (nobody logged on yet), disabled, or unknown.
- sessionIdstringrequired
fixsim_send_order10 params · 7 required
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.
- instancestringrequired
- sessionstringrequired
- clOrdIdstringrequired
- symbolstringrequired
- sidestringrequired
- orderQtynumberrequired
- ordTypestringrequired
- pricenumber
- additionalTagsarray
- apiKeystring
fixsim_list_orders_in5 params · 2 required
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.
- instancestringrequired
- sessionstringrequired
- orderStatusstring
- limitinteger
- apiKeystring
fixsim_list_executions_in5 params · 2 required
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).
- instancestringrequired
- sessionstringrequired
- execIdstring
- limitinteger
- apiKeystring
fixsim_act_on_orders7 params · 4 required
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.
- instancestringrequired
- sessionstringrequired
- actionstringrequired
- clOrdIdsarrayrequired
- lastPxnumber
- lastQtynumber
- apiKeystring
sandbox_set_autofill2 params · 2 required
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.
- sessionIdstringrequired
- enabledbooleanrequired
fixsim_cancel_order_out6 params · 3 required
Have FIXSIM send an Order Cancel Request (35=F) for an order it previously sent out with fixsim_send_order.
- instancestringrequired
- sessionstringrequired
- clOrdIdstringrequired
- newClOrdIdstring
- additionalTagsarray
- apiKeystring
fixsim_list_sessions2 params · 1 required
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.
- instancestringrequired
- apiKeystring
fixsim_list_executions_out5 params · 2 required
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.
- instancestringrequired
- sessionstringrequired
- clOrdIdstring
- limitinteger
- apiKeystring
fixsim_get_session3 params · 2 required
Get one FIX session's settings and live state (logged in?, sequence numbers, connection details).
- instancestringrequired
- sessionstringrequired
- apiKeystring
sandbox_act_on_order3 params · 3 required
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.
- sessionIdstringrequired
- clOrdIdstringrequired
- actionstringrequired

Availability history

Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.

Era history

Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.

Era distribution

Dual-era100%

Dual-era13.09 12:47

13.09 04:35Measurements: 513.09 12:47

Dual-era

Response time history

The two probe legs separately: modern server/discover and legacy initialize.

server/discoverinitialize

Event log

Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.

11 hours agoAdded to watch — era: Dual-era

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Add this badge to your README — it updates automatically as measurements change.

Markdown

[![mcpmetrics](https://mcpmetrics.io/badge/io.github.GammaThreeTrading/fixsim/era.svg)](https://mcpmetrics.io/servers/io-github-gammathreetrading-fixsim)

HTML

<a href="https://mcpmetrics.io/servers/io-github-gammathreetrading-fixsim"><img src="https://mcpmetrics.io/badge/io.github.GammaThreeTrading/fixsim/era.svg" alt="mcpmetrics"></a>

Raw observations

You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.

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