... but will the BXT coin only be used on the BXT exchange? or later will listing in other markets?
BXT ICO is currently in have partnerships with: Binance, Forkdelta, Idex, Yobit. I think now you can answer yourself for your question 
I got information about partnersfrom their telegram admin.
Where did this information came from, do you have links to where I can confirm about this?