They are often marketed towards investors who may not have the stomach for the volatility associated with Bitcoin, Ethereum and other popular cryptos--which have been known to see-saw widely in value on a day-to-day basis.... Here is what experts say investors should know about the novel class of cryptos dominating headlines in recent weeks. What are stablecoins?... Stablecoins are essentially cryptocurrencies that are backed by a reserve asset--usually a traditional currency such as the U.S.