Creating an exchange


suppose i would like to create an cryptocurrency exchange…besides the makers and takers fees can i charge coins for listing on my exchange? Are there examples of exchanges doing so now?

Not sure what you are after. But from hearsay there are coins paying for a listing on an exchange. This will unlikely be coins in the top 50 or so with decent volumes. Usually new coins or pumps and dump schemes. I don’t think it is a sustainable model but I might be wrong.