Stablecoins are cryptocurrencies whose rate is stabilized by being tied to the value of tangible assets. The most famous example is the USDT token, worth $1. These tokens are convenient for mutual settlements since the value of other cryptocurrencies tends to change unpredictably and significantly over time. In addition to dollars, such tokens can be backed by precious metals, oil, or other cryptocurrencies. Sometimes, they are not supported by anything, but the increase and decrease of the money supply in circulation is controlled by intelligent contract algorithms, which ensures their relatively stable rate.