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 — right here on this page. No account. No install. No counterparty paperwork.

Your sandbox session has ended and its history is gone.
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Sandbox sessions expire, CompIDs are assigned, nothing persists. Need persistent sessions, your own CompIDs, custom fills and scenarios, TLS? Start a free 7-day trial of FIXSIM — full product, no credit card.