This article explains in detail the Lybra Finance project, an LSDfi stable currency protocol. Its main business model is to mortgage ETH or stETH to mint the stable currency eUSD, and use the proceeds of LSD to repurchase eUSD to earn interest on the stable currency. The annualized rate is between 7% and 9%. The interest on the stable currency comes from the interest on the ETH pledge. , so the higher the mortgage rate, the higher the interest. eUSD is maintained stable by over-collateralization, liquidation, and arbitrage. The LSDfi track has relatively good fundamentals, narrative value and user demand. Lybra Finance is currently the LSDfi protocol with the highest TVL. The first interest-bearing stable currency eUSD has a certain attraction for funds in the market. Therefore, this product deserves attention.