Cardano isn’t usually the first place people look for DeFi innovation. But projects like FluidTokens are beginning to challenge that assumption, focusing on fundamentals like decentralization, fee stability, and long-term scalability. That vision starts with Aquarium, FluidTokens’ system for making Bitcoin usable within Cardano DeFi. It introduces Babel Fees, which allow users to cover transaction costs with any Cardano Native Token—including bridged Bitcoin—without needing ADA
source: https://beincrypto.com/ceo-matteo-coppola-fluidtokens-vision/