What is the flat fee for Gemini?

I'm curious to know, what exactly is the flat fee that Gemini charges for their services? I've heard that some platforms have different fee structures depending on the transaction size or the type of service being offered, but I'm specifically interested in understanding the static, non-variable cost associated with using Gemini. Is there a one-time fee or a recurring fee that users can expect to pay when utilizing this cryptocurrency exchange? Clarifying this point would greatly help me in evaluating the overall cost-effectiveness of Gemini for my needs.