Is Phemex free to use?

I'm curious, is Phemex a free platform to use for cryptocurrency trading and finance? Are there any hidden fees or charges that users should be aware of before signing up and starting to trade? I'm looking for a reliable and cost-effective solution for my trading needs, so it's important for me to understand the full financial picture before making a decision. Can you provide me with more information on the costs associated with using Phemex?