Decentralized finance is digital assets that work on the basis of blockchain technology, as well as cryptocurrencies like Bitcoin or Ether. But unlike the cryptocurrency payment systems Bitcoin and Ethereum, Defitrading services use derived crypto assets - tokens. These are digital units issued on the basis of already working blockchain platforms like Ethereum. Defitrading are tokens having the functions of traditional financial assets. An example is DAI tokens based on the decentralized Maker platform. The cost of DAI on the cryptocurrency exchanges is equal to $1, that is why this token is called a "dollar stablecoin".