What is the Loopring swap fee?

As a keen observer of the cryptocurrency market, I'm curious to know about the economics behind decentralized exchanges. Could you elaborate on the Loopring swap fee? I understand that Loopring aims to provide a non-custodial, decentralized exchange protocol, but I'm particularly interested in how its swap fee works. Does it vary depending on the type of transaction or the amount being exchanged? Is it a flat fee or does it scale with the transaction size? Furthermore, how does this fee compare to other decentralized exchanges? Your insights would be invaluable in helping me make informed decisions about my trading activities.