Hyperliquid's on-chain perpetual DEX trading volume has decreased to $6.07 billion, according to DefiLlama data as of April 21. Despite this decline, Hyperliquid maintains the largest open interest among perpetual DEXs, totaling $7.31 billion, surpassing the combined open interest of all other platforms. In comparison, TradeXYZ experienced a slight rebound with a 24-hour trading volume of $1.92 billion and an open interest of $1.82 billion. Other notable platforms include Aster with a trading volume of $1.95 billion and open interest of $1.97 billion, EdgeX with $1.95 billion in trading volume and $960 million in open interest, Lighter with $1.53 billion in trading volume and $720 million in open interest, and Pacifica with $485 million in trading volume and $808.9 million in open interest.