Around 22:30 UTC+8 on November 23, the price of the WBTC/USDT trading pair on Binance crashed, and the price fell to 5209 USDT at one point, and then quickly returned to normal; the 15-minute trading volume also increased from less than 1 WBTC per day to 88.6 WBTC. The reason for the flash crash may be that the liquidity of the trading pair is low, and the price is abnormal when there is a large market sell order.