xDeFi is a well-established DeFi protocol stack. Many practices have been introduced in the xDeFi ecosystem, including but not restricted to: xDEX as one of the optimized AMM DEXes, xHalfLife as a money stream protocol for delayed unlocking of tokens, xOption as an European call and put option with AMM pools, xPerp as a perpetual protocol with shadow AMM, xSTA as a stablecoin minted from crypto assets, xNFTEX as a NFT market with high liquidity, and other DeFi building blocks.