Lending by code, not by branch
A decentralized-finance lending app replaces much of a bank’s administrative role with a smart contract: software on a blockchain that automatically follows preset rules. A borrower supplies cryptocurrency as collateral, and the contract releases a loan when the deposit meets its requirements. Lenders can add assets to a shared pool; borrowers draw from it and pay interest, which helps compensate pool participants.
That setup can make borrowing available to people who cannot use a conventional bank, provided they can access the app and meet its collateral rules. But it does not eliminate intermediaries in every sense. The protocol’s developers, governance arrangements, wallet providers, and blockchain infrastructure can all matter, and transactions may carry network or protocol fees.
Why the collateral rules are strict
Crypto prices can move sharply, so these systems commonly require collateral worth more than the loan. If its value falls too far, the contract may automatically sell some of it to repay the debt. This is called liquidation. It protects the lending pool from being left with an unpaid loan, but it can force a borrower to lose collateral during a market drop—sometimes quickly, without the time or flexibility a bank might offer to renegotiate.
Interest rates can also change as borrowing demand and available pool funds shift. A posted yield is therefore not a guaranteed return: it depends on borrowers paying, the protocol operating as intended, and the value of the assets involved.
The tradeoff behind wider access
Traditional banks screen customers and manage loans through institutions; DeFi apps instead make access depend heavily on having compatible digital assets and navigating automated rules. That can reduce reliance on a bank’s approval process, but it shifts more responsibility to users. A person may avoid a branch and still face price swings, technical failures, or a liquidation triggered by a sudden drop in collateral. The decisive moment can be a line in code—an asset crossing a threshold—and a sale that follows automatically.
