How much does SimpleSwap charge?

I'm curious to know, what are the fees associated with using SimpleSwap for cryptocurrency exchanges? Do they have a standard rate for all transactions, or do the fees vary depending on the type of cryptocurrency being swapped or the amount being exchanged? Is there a clear breakdown of the fees on their platform, or do customers need to do some digging to find out? Additionally, do they offer any discounts or promotions to reduce the cost of transactions for frequent users?