Collateral is an asset a borrower pledges as security for a loan or other financial obligation. In crypto and decentralized finance (DeFi), collateral is typically a digital asset locked in a smart contract to help ensure repayment, or to guarantee performance in a protocol.
How collateral works in crypto lending
In traditional lending, a bank might take a house or car as collateral. In crypto, borrowers commonly deposit tokens such as ETH, BTC, or stablecoins into a lending protocol. The protocol then allows the borrower to withdraw another asset, often a stablecoin, up to a limit defined by a loan-to-value (LTV) ratio. Because crypto markets can be volatile, many DeFi loans are overcollateralized, meaning the collateral value must be higher than the borrowed amount.
A practical example is depositing ETH into a DeFi lending app to borrow USDC. If the value of ETH falls and the position exceeds the protocol’s risk limits, the smart contract can trigger liquidation, selling part of the collateral to repay the loan and protect lenders. This automated enforcement is one reason DeFi can offer loans without relying on credit scores.
Types of collateral and where it is used
Crypto collateral can include fungible tokens like ETH or wrapped BTC, and in some systems even non-fungible tokens (NFTs), although NFT collateral is generally harder to value and can be more risky. Collateral is also used beyond borrowing, such as in derivatives and leveraged trading, where it acts as margin to back a trader’s position.
Collateral matters in the crypto ecosystem because it underpins trust, risk management, and capital efficiency, enabling borrowing, stablecoin issuance, and other DeFi services without centralized intermediaries.