Lending is one of the oldest financial activities, and one of the first that crypto tried to rebuild. This guide follows credit from traditional banks to DeFi protocols and explains why the move from overcollateralized to uncollateralized lending is the central problem of on-chain credit.
Lending in traditional finance
In traditional finance (TradFi), banks and other lenders sit between savers and borrowers. They assess creditworthiness, set rates, hold collateral where needed and enforce repayment through the legal system. This intermediation makes credit possible without collateral, through credit scores, financial statements and legal contracts, but it is slow, costly and closed to many borrowers and investors.
The DeFi model: code instead of intermediaries
DeFi lending protocols replace the intermediary with smart contracts. Lenders deposit into pools, borrowers lock collateral and take loans, and the code calculates interest and liquidates positions automatically. Anyone with a wallet can participate.
The catch is overcollateralization. Because smart contracts cannot assess identity or enforce repayment in court, every loan must be backed by more collateral than it lends. That keeps lenders safe but limits borrowing to people who already hold crypto, mostly for trading and leverage.
Uncollateralized lending: putting credit back on-chain
From around 2021, a new group of protocols tried to offer loans with little or no collateral, aimed at institutions such as market makers, crypto companies and fintechs. They combined on-chain pools with off-chain credit assessment and legal agreements.
From crypto institutions to real-world credit
The 2022 market crash and a series of defaults showed that lending to crypto institutions without collateral was risky. Many protocols shifted toward real-world borrowers: fintechs, trade finance providers and businesses with revenue. That shift created today’s on-chain private credit market, where blockchain handles funding and settlement while legal structures handle recourse.
TradFi vs DeFi vs on-chain credit
| TradFi lending | DeFi lending | On-chain credit | |
|---|---|---|---|
| Who decides on credit | Bank or lender | Collateral rules in code | Underwriter plus lenders |
| Collateral | Varies | Overcollateralized | Low or off-chain |
| Access for lenders | Limited | Open | Open or KYC-gated |
| Recourse on default | Legal | Liquidation | Legal |
Next: learn how to borrow against crypto, how crypto lending works, or explore on-chain credit use cases.
