Soft Liquidation

A gradual, continuous liquidation mechanism that converts collateral incrementally to the borrowed stablecoin as prices fall through a range, rather than triggering a single large liquidation event when a collateral ratio threshold is breached. Standard DeFi lending protocols use hard liquidation: when collateral value falls below a minimum threshold, an external liquidator buys the entire collateral at a discount in a single transaction, instantly closing the position. Soft liquidation, implemented in Curve Finance's LLAMMA algorithm for crvUSD, instead places collateral in a series of price bands within an automated market maker, so that as prices fall, collateral is gradually and continuously sold into the borrowed stablecoin. If prices recover before full liquidation, the mechanism automatically buys collateral back, allowing positions to partially or fully recover their original collateral without any manual intervention required from the borrower. Example: A user who deposits ETH as collateral for a crvUSD loan at 150% collateralization and watches ETH price fall 20% would, under Curve's LLAMMA, see their collateral gradually converted to crvUSD as the price moves through the soft liquidation bands, incurring AMM swap fees but not the full liquidation penalty they would face on Aave or Compound. If ETH then recovers 20%, LLAMMA converts the crvUSD back to ETH, and the user retains most of their original collateral minus accumulated swap fees. Why it matters for DeFi: Soft liquidation materially improves the experience for borrowers by removing the binary cliff-edge of traditional hard liquidation, replacing a catastrophic single event with a gradual, recoverable process. It also reduces the systemic risk from liquidation cascades, where large hard liquidations depress prices further, triggering more liquidations in a self-reinforcing spiral. The mechanism has influenced subsequent lending protocol designs and is likely to become more widely adopted as DeFi matures.

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