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Finance

Building Decentralized Lending

Judith MwauraBy Judith MwauraMay 1, 2025No Comments4 Mins Read
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What is Borrowing and Lending?

Borrowing and lending in decentralized finance (DeFi) is a common financial activity where people can either lend out their crypto assets to earn interest or borrow assets by offering collateral.

This system helps make better use of unused assets and allows people to get quick access to funds for trading or investment opportunities.


How Borrowing and Lending Work

Borrowing

To borrow, users must lock up a certain amount of crypto (called collateral) in a smart contract. The amount they can borrow depends on the value of the collateral and rules set by the lending platform.

Lending

Lenders deposit their crypto into a lending pool, which is managed by a smart contract. Borrowers can then access this pool to get loans. Lenders earn interest from the borrowers in return.

These systems use oracles—services that provide real-time price data—to manage risks, interest rates, and to decide when to liquidate (sell off) a borrower’s collateral if its value drops too much.


Key Parts of the Lending Process

1. Loan Origination

This is the process of creating a loan. The platform checks the value of the borrower’s collateral and calculates how much they can borrow.

2. Collateralization

To protect lenders, borrowers must provide more value in collateral than the amount they want to borrow. The exact amount varies by platform and depends on the risk of the asset.

3. Interest Calculation

Interest is calculated based on how much is borrowed and the agreed rate. This is automatically done by the smart contract.

4. Liquidation

If the value of the collateral drops too low, the platform can automatically sell it to recover the loan. This protects lenders from losing money.

Some platforms reward users who help monitor and trigger these liquidations.


Interest Rate Models

DeFi platforms use different methods to decide interest rates:

  • Algorithmic: Adjusts rates automatically based on demand and supply.
  • Order Book: Matches lenders and borrowers based on offers, like in stock markets.
  • Governance-Based: Interest rates are voted on by token holders.
  • Fixed Rates: Rates stay the same for a set time.
  • Dynamic Rates: Rates change based on factors like volatility and risk.

Pool Models: Shared vs. Isolated

  • Isolated Pools: Each borrower’s assets and loans are kept separate from others. One user’s actions don’t affect others.
  • Shared Pools: All users’ assets are combined. This increases liquidity but also comes with higher risk if something goes wrong.

Borrow/Lending Service Types

  1. Money Markets
    These are on-chain platforms where users can lend and borrow from shared pools.
  2. Peer-to-Peer (P2P)
    Users lend and borrow directly from each other by agreeing on terms like interest and loan duration.
  3. Yield Farming
    Users earn extra rewards by using their crypto in DeFi protocols that generate returns.
  4. Flash Loans
    Short-term loans without collateral that must be repaid in the same transaction.
  5. Synthetic Lending
    Users lend and borrow digital versions of real-world assets.

How Oracles Help Borrow/Lending Platforms

Oracles provide real-time price data for assets, which is crucial for:

  • Valuing Collateral: They calculate loan-to-value (LTV) ratios to ensure loans are properly backed.
  • Triggering Liquidations: If the collateral drops in value, oracles help decide when to sell it off.
  • Setting Interest Rates: Price data helps platforms adjust rates based on market conditions.
  • Collateral Swaps: Some platforms let users change their collateral; oracles help ensure the value is fair.

Oracles like Pyth offer low-latency and accurate pricing. They also give confidence ranges showing how reliable the price is. Wider ranges mean more market uncertainty, helping platforms better manage risk.


Borrowing and Lending Glossary

  • APR (Annual Percentage Rate): Yearly interest rate on a loan.
  • Borrowing Limit: The maximum amount a user can borrow.
  • Collateral: Assets locked to secure a loan.
  • Collateralization Ratio: Loan amount vs. value of collateral.
  • DSCR (Debt Service Coverage Ratio): A measure of whether a borrower can repay their debt.
  • Flash Loan: Instant, no-collateral loan that must be paid back in one transaction.
  • Interest Rate: Cost of borrowing or earnings from lending.
  • Leverage: Borrowing to increase potential profits or losses.
  • Liquidation: Selling collateral when its value drops too low.
  • Loan-to-Value (LTV): Ratio of loan amount to collateral value.
  • Overcollateralization: Putting up more collateral than borrowed to reduce risk.
  • P2P Lending: Lending directly between users without a middleman.
  • Undercollateralized Loan: Loan backed by less collateral than required—high risk.
  • Yield Farming: Earning rewards by locking crypto in DeFi platforms.

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Judith Mwaura
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Judith Mwaura is a dedicated journalist specializing in current affairs and breaking news. She is passionate about delivering accurate, timely, and well-researched stories on politics, business, and social issues. Her commitment to journalism ensures readers stay informed with engaging and impactful news.

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