What is the fee rate for Poloniex?

I'm curious, can you please clarify for me the fee rate that Poloniex charges for its users? As a cryptocurrency trader, it's important to know the costs associated with various exchanges in order to make informed decisions about where to conduct my transactions. Is the fee rate a flat fee or does it vary based on factors such as the type of cryptocurrency or the amount being traded? Additionally, are there any other fees or charges that I should be aware of when using Poloniex? Thank you for your assistance in helping me understand the fee structure of this platform.