The theme of stablecoins (stable coins), unlike cryptocurrencies, until recently, was not given much attention. However, the projects for creating stablecoins Libra (Facebook) and JPM Coin (JPMorgan Chase), the project of the largest banks in the world to create an institutional stable coin (USC), secured by bank deposits in the central bank, caused a heated discussion about the nature, types, functions and consequences of various types of stablecoins on the monetary policy of central banks and the global financial system as a whole. Research on stablecoins are analyzed, including global stablecoins, carried out by the G 7 working group, the European Central Bank, the Bank for International Settlements, the Council for Financial Stability, the Swiss financial market supervision authority FINMA, and the work of scientists and specialists on this topic, published in 2018-2019. In most studies, stablecoins are considered as a kind of cryptocurrency, which eliminates their most important drawback - high volatilit