What is a 0.05% fee tier?

Excuse me, could you clarify what exactly is meant by a "0.05% fee tier" in the context of cryptocurrency transactions or financial services? Is this a reference to a specific type of transaction fee structure where a certain percentage of the transaction amount is charged, and in this case, that percentage is 0.05%? Is this fee tier offered by a particular exchange, wallet, or financial institution? Understanding the context and specifics of this fee tier would be greatly appreciated.