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Decentralized Finance, nicknamed briefly as DeFi, is all about a new monetary system built on blockchains. This term gathers a diversity of monetary applications with the purpose of getting rid of financial intermediaries and brokers. DeFi is represented by decentralized applications, which are also known as DApps. These plug-and-play tools facilitate access to financial services for any individual by means of a smartphone, at low expenses. The potential to reduce the financial costs for users is estimated to an amazing 50%.