Is ndax free?

Hello, I'm curious about the platform NDAX and I've heard some great things about it. However, I'm a bit hesitant to sign up without knowing if there are any fees associated with using the platform. Can you clarify if NDAX is free to use or if there are any charges that I should be aware of? I'd appreciate any information you can provide, as I'm looking to make a decision about which cryptocurrency exchange to use. Thank you in advance for your help!