USDX is a synthetic USD stablecoin built for blockchain ecosystems, particularly Bitcoin. It maintains its peg through a delta-neutral strategy by using BTC as collateral and hedging with derivatives. Users can stake USDX to earn yield, represented by the sUSDX token, which appreciates over time. USDX can be bought or minted using stablecoins or Bitcoin, and redeemed for Bitcoin, with KYC/KYB verification for certain operations.