A lending pool is a pool of cryptocurrency locked in a smart contract (or managed by a platform) that lets users lend and borrow assets without matching directly with a specific counterparty. Lenders deposit tokens into the pool and earn yield, while borrowers take loans from the shared liquidity, typically by posting collateral.
How lending pools work in DeFi
In decentralized finance (DeFi), lending pools are usually governed by algorithmic rules that set interest rates based on supply and demand. When many people borrow an asset, available liquidity drops and rates tend to rise, which attracts more deposits and discourages additional borrowing. Depositors often receive a receipt token that represents their claim on the pool and accrues interest over time, for example interest-bearing tokens used by protocols such as Aave or Compound.
Borrowing is commonly overcollateralized. A user might deposit ETH as collateral and borrow a stablecoin from the pool. If the collateral value falls too far relative to the loan, the protocol can trigger liquidation, selling collateral to keep the pool solvent. This automated risk management is central to keeping lending pools functional without a traditional credit check.
Practical uses and key risks
Lending pools enable use cases like earning passive yield on idle assets, accessing liquidity without selling long-term holdings, and supporting leverage in margin and derivatives venues that integrate borrow-lend markets. They can also be implemented in centralized platforms, where a company pools user funds and manages loans, though that introduces additional custodial and counterparty risk.
Common risks include smart contract bugs, oracle failures that misprice collateral, liquidity crunches during market stress, and governance or parameter changes that affect rates and safety. Lending pools matter because they provide on-chain credit and liquidity, forming core infrastructure for DeFi markets and broader crypto capital efficiency.