Quick answer
A lending protocol uses smart contracts to let users supply or borrow assets according to collateral and interest rules.
What is Lending protocol?
A DeFi lending protocol matches supplied liquidity with borrowers through an on-chain ruleset. Interest rates, collateral ratios, liquidation thresholds, and available assets are determined by the protocol’s design and current utilization.
The useful way to approach this term is to separate its definition from the assumptions people often attach to it. In crypto, the same word can appear in a protocol rule, a user interface, a market-data label, or a marketing claim. Check which layer the explanation is describing.
Why does lending protocol matter?
Borrowing can create liquidation risk, while supplying can expose users to oracle failures, bad debt, contract bugs, and liquidity constraints. A variable rate can change rapidly.
Concrete example
See it in a real situation
A user deposits ETH as collateral and borrows a stable-value token. If ETH falls below the protocol’s threshold, part of the collateral may be sold to repay the loan.
Common misconceptions
What this term does not mean
- Overcollateralization does not make liquidation impossible.
- The protocol’s displayed supply rate is not a bank-insured deposit rate.
Related terms
Sources and further reading
Definitions are written for education and checked against the sources below where relevant. A source can explain a protocol or rule without endorsing every product built around it.