Crypto exchanges

Hello,
I would like to know if with a paid crypto exchange DLL (e.g BitMEX) it's possible to use native orders and specific features of the exchange, to be able to exploit every aspect of the API of the exchange.

Another question: I see that 1 exchange costs 400$ and all exchanges 2700$. There could be some promotions to purchase, let's say a package of 3 exchanges?