I gave it a quick try and:

1. I find it counter-intuitive. I was expecting something like cryptrader.com, but whatever I do I am sent around in circles. Clearly I won't put API keys in just like that, I wanted to see various exchanges all in one view without them.
I open trading terminal, I am sent to a presentation page, I am asked to sign up although I am signed in and if I press sign up I am sent back to main view.

2. As long as it works for free with known disposable mail addresses, nobody will pay those 4$/month.


I guess that you should work on improvements first. (And for API keys, trust has to be built in time).