QFS  Ledger uses Stablecoins which are a viable solution to volatility issues surrounding cryptocurrency and helping Defi gain prominence. The name says it all, stable coins  value is tied to a relatively stable asset, like gold or the US dollar, to keep its price consistent. Stablecoins become useful during risk-off moments in the crypto space, providing a safe haven to investors and traders. Stability makes them a reliable collateral asset. 

Stablecoins also play an important role in liquidity pools - an integral part of the DeFi ecosystem and DExs.