FIXSIM
FIXSIM Developer Sandbox: a Free Hosted FIX Test Endpoint
A live FIX counterparty, free, in one click. Create a sandbox session, point your FIX engine at it, and watch your logons, orders, and fills parse into readable FIX in your browser. No account. No install. No counterparty paperwork.
How It Works
- Create a session. Pick a FIX version and click once. You get a host, port, and assigned CompIDs.
- Connect your engine. QuickFIX, your own stack, anything. The sandbox answers your logon immediately.
- Trade against yourself. Send an order and it lands in a working-order blotter on the page. Click Fill, Partial, Reject, or Cancel and watch the execution report stream back to your engine in real time.
What You Get, Free
- A hosted FIX acceptor with a real internet network path (test the connectivity a localhost setup cannot)
- FIX 4.0, 4.2, 4.4, and 5.0 SP2 over FIXT 1.1
- A live message viewer: every message parsed into readable fields, with the raw FIX underneath
- A mini blotter where you act as the counterparty: fill, partial fill, reject, or cancel incoming orders
- Automatic acks, optional auto-fills, session recovery by URL
Sandbox limits: one session at a time, 100 application messages per day, 4-hour sessions, assigned CompIDs, nothing persists. That is the point: it is a sandbox. Need persistence, your own CompIDs, the Rule Builder, replay, or the REST API? Those live in the full product, from $500 per month with a 7-day free trial.
Common Questions
Is there a free version of FIXSIM?
Yes. The FIXSIM Developer Sandbox is a free, hosted FIX test endpoint: create a session in one click, connect any FIX engine, and act as the counterparty yourself. No account required. For real testing work, paid plans start at $500 per month.
Do I need an account to use the FIXSIM sandbox?
No. There is no signup, no email, and no login. Click Create sandbox session, point your FIX engine at the assigned host, port, and CompIDs, and start sending messages.
Which FIX versions does the free sandbox support?
FIX 4.0, 4.2, 4.4, and 5.0 SP2 over FIXT 1.1. The sandbox runs the same engine as the commercial FIXSIM platform.
What are the sandbox limits?
One session at a time, 100 application messages per day, and sessions expire after 4 hours. Heartbeats and session traffic are free. Nothing persists: for persistent sessions, your own CompIDs, and automated scenarios, FIXSIM plans start at $500 per month with a 7-day free trial.
How is the sandbox different from a self-hosted FIX simulator?
It is already running. There is nothing to install, build, or configure: the sandbox is a real network endpoint with actual TLS-capable internet connectivity, so you can test the network path a localhost simulator cannot.
