# Exchange order matching system/core for local testing

I am looking for a service that can be deployed locally or connected to it and would emulate the order matching system of exchange (a.k.a matching core).

I remember, that I have seen on GitHub repo, with software, which allows simulating NYSE or NASDAQ exchange ECN behavior. So I could send orders to it, and check how they could be executed by the trading system. Of course it's not 100% the exact copy of exchange core, but it allows to simulate different behavior.

I guess I am not the only one with this problem, so I am looking for advice. Could someone remind me or share their own expirience for emulating order-matching behavior?