Stable coin is needed to wait out the drawdown of the market someone uses Steem Dollar, bitUSD, NuBits coins to stay stable at the moments of market drawdowns but the volumes are very small. There is a Tether(USDT) with good volume and smooth reputation but they got problem with registration, the issue is under the Committee, who decided the issue of registration share your experience? But there are still some coins which are backed by real assets, plants, factories etc in them, I believe it is much less but still as a temporary Spasenie from the pit can be viewed for a very short entrance.