st-yBOLD is Yearn’s auto-compounding vault for BOLD deposited in Liquity V2’s Stability Pools. When a borrower’s position drops below the required collateral ratio, the pool uses your BOLD to repay their debt and receives collateral at a discount. These rewards—liquidation gains and interest payments—are automatically harvested, swapped, and reinvested, steadily increasing the value of your st-yBOLD over time.