Ethena Labs proposed integrating its synthetic stablecoin, sUSDe, into World Liberty Financial (WLFI) on Dec. 18.The partnership aims to boost capital efficiency and liquidity in WLFI's new Aave instance.sUSDe has become the third-largest stablecoin with a $6.1 billion market cap.Integrations with major DeFi protocols and its high annual percentage yield (APY) of 27% contributed to the rise of sUSDe.