Lending on DeFi
- Author
- CRYPTO PORT Editorial
- Published
- Updated
- Reading time
- 7 min
In short
Lending in DeFi means depositing assets into a contract and receiving a share of the interest borrowers pay. Rates float with supply and demand; they are not fixed. If borrowers' collateral collapses faster than it can be liquidated, or if the contract itself fails, the principal you deposited may not come back.
Key points
- Rates float continuously; a displayed figure describes this moment only
- When most of the deposited pool is lent out, withdrawal can be delayed
- If a borrower's collateral falls faster than liquidation can cover, depositors can absorb the shortfall
- Contract flaws and manipulated price feeds are permanent routes to losing the principal
Definition
Depositing crypto into a lending protocol's contract so that it can be borrowed against collateral, in return for a share of the interest borrowers pay.
The skeleton of the design: a lending protocol keeps a pool per asset, lenders deposit into it, and borrowers take from it after posting a different asset as collateral. Borrowers pay interest on their debt; part goes to the protocol and the rest is distributed to lenders. Your claim is against the pool, not against any individual.
In practice you verify the official domain yourself, connect, choose the asset and amount, and first sign an approval so the contract can move that asset. Then you sign the deposit. Most designs issue a token representing your share, whose balance grows with interest or whose redemption rate rises over time.
On rates, the essential point is that they float. Most protocols set them algorithmically from utilisation — how much of the pool is currently borrowed. Heavy borrowing demand pushes rates up; slack demand pushes them down. Do not plan on the number you saw at deposit persisting. No figures appear here because they move, and would be stale the moment they were written.
Withdrawal depends on the state of the pool. When most of the deposits are lent out, how much you can take back is limited. The design normally responds by raising rates, which attracts deposits and encourages repayment until liquidity returns — but stressed markets are exactly when everyone tries to withdraw at once. Do not assume access on demand.
Finally, how the principal is lost. One route is borrower collateral falling so fast that liquidation cannot keep up, leaving bad debt; some protocols allocate that shortfall to depositors. The other is a contract vulnerability, or manipulation of the price feed used to value collateral. Either way, no rate is high enough to matter if the principal goes to zero.
Watch out for
- · Deposits have been drained in full through contract vulnerabilities and manipulated price feeds. This is unrelated to how attractive the rate was
- · Where borrower collateral collapses and leaves unrecoverable debt, some protocols allocate that loss to depositors
- · In fast-moving markets, withdrawal demand concentrates and you may not be able to take out what you want. Do not assume access exactly when you need it
Frequently asked questions
Shouldn't I just pick the protocol with the highest rate?
A high rate usually reflects strong borrowing demand or elevated risk, so it does not work as a standalone comparison. Any meaningful comparison has to include the chance of not getting the principal back, and that is not visible in the advertised rate. No protocol is recommended here.