DeFi Reflections: Four stablecoins go to zero in one week, firmly say NO to 'black-box operations' Yield-based stablecoin xUSD experienced a flash crash due to Stream's $93 million loss, triggering a chain reaction in the DeFi market. This led to four stablecoins going to zero within a week and caused a combined $285 million in bad debt for major lending protocols like Morpho and Euler.