This is actually a great way for projects to get listed in your exchange especially new ones. What is the criteria for the evaluation of a project and determining a project's "potential". Also, what are the listing fees. Could you provide more details on the trading voulme of your exchange?
Most important criteria is legit team and usecase of token; there is something moe. There is no fixed listing fee. It is also up to project's potential. For volume:
https://api.felixo.com/v1/ticker