What is the monthly maintenance fee?

I'm curious about the cost structure associated with maintaining my cryptocurrency investments. Specifically, what is the monthly maintenance fee that I can expect to incur? Is this fee standard across all cryptocurrency platforms, or does it vary depending on the specific platform or service provider? Furthermore, what services or benefits does this fee cover, and are there any potential ways to reduce or avoid this cost altogether? Understanding these details will help me make more informed decisions about managing my investments in the cryptocurrency space.