What is decentralized lending?

What Is DeFi?

In traditional finance, users must have a bank account and undergo complex identity verification procedures to access basic financial services. Especially when borrowing, they’re required to submit sensitive personal information, provide high-value collateral, and go through multiple rounds of rigorous screening by financial institutions. This process is often cumbersome, time-consuming, and costly.

With DeFi’s decentralized financial services, anyone who supplies collateral can directly complete a loan without revealing personal information to third parties. Borrowers can quickly and transparently secure loans and pay interest by pledging their crypto assets. Meanwhile, lenders can earn attractive yields by depositing assets on decentralized lending platforms.

At its core, DeFi enables lending relationships to be executed via smart contracts, where all terms are pre-programmed into the contract. Once conditions are met, the lending relationship between parties is fulfilled automatically without third-party maintenance or oversight. This model ensures high transparency, fairness, and efficiency throughout each transaction.

Decentralized lending has broken down traditional barriers in finance. On one hand, it dramatically increases the utilization of crypto assets, putting idle funds in wallets to productive use. On the other, it enables users to generate passive income by holding and lending cryptocurrencies. These advantages have fueled DeFi’s explosive growth and driven the rapid development of the broader crypto ecosystem.

DeFi Lending Models

The primary lending models in DeFi can be grouped into three main categories, each with distinct features, strengths, and weaknesses.

Peer-to-Peer Model

In this model, borrowers and lenders are listed directly on the platform, which functions as an aggregator and connector. If a borrower fails to repay on time, the platform automatically initiates liquidation using pre-programmed smart contracts.

Leading platforms like dYdX and Dharma exemplify this peer-to-peer approach. However, peer-to-peer lending can be hindered by complex aggregation and matching processes, resulting in lower transaction efficiency. Users may wait a long time to find a suitable counterparty for their loan.

Stablecoin Model

The most prominent stablecoin-based lending platform is MakerDAO on Ethereum. Within MakerDAO’s ecosystem, users can deposit ETH as collateral to borrow the stablecoin DAI, which is pegged to the US dollar (USD). To maintain system safety, the platform requires a minimum collateralization ratio of 150% or higher.

MakerDAO stands out because its interest rate isn’t set by any individual or organization; instead, it’s determined through democratic voting by MKR token holders. This system, however, results in highly volatile interest rates. For example, MakerDAO’s rates once surged from 2.5% to 19.5% in just over a month, highlighting the governance model’s instability.

Liquidity Pool Model (Liquidity Pool)

This is the most popular and widely adopted DeFi lending model. Leading platforms Compound and Aave have successfully implemented it, attracting billions in total value locked (TVL).

The liquidity pool model resembles traditional bank lending but offers far more flexibility. Users can deposit and withdraw at any time, without fixed terms. The system aggregates all lenders’ funds into a common pool. As long as there’s sufficient liquidity, borrowers can access loans instantly without waiting. Interest rates are dynamically adjusted by smart algorithms to balance market supply and demand.

Compound pioneered this model, allowing users to deposit assets into the platform’s liquidity pool and receive representative tokens. Compound’s unique proof-of-interest token mechanism has become an industry standard. When users supply assets, they receive cTokens as proof of interest. The cToken exchange rate is based on the cumulative interest rate of the underlying asset and automatically increases over time. Users simply hold cTokens in their wallet to earn interest without any manual action.

Aave is also a liquidity pool-based lending platform, offering numerous innovations. Users can deposit assets at any time to earn interest or borrow other assets flexibly. Notably, Aave introduced the industry’s first uncollateralized lending product—“flash loan” (flash loan), which was revolutionary for DeFi.

Aave’s flash loans require no collateral, marking a major breakthrough compared to traditional lending. However, the key condition is that both borrowing and repayment must occur within a single Ethereum block (approximately 15 seconds). If this deadline isn’t met, the smart contract automatically reverses all prior transactions, ensuring complete safety and protecting lender assets.

Security Challenges in DeFi Lending

The above models provide a basic understanding of decentralized finance products. Still, a critical question remains: How can DeFi transfers remain uncensored, fast, and efficient, yet still guarantee absolute safety for lenders and platform assets?

Since traditional credit ratings don’t exist in the DeFi space, mainstream platforms rely on over-collateralization and strict, automated liquidation processes executed by smart contracts.

Default risk is minimized through over-collateralization. For example, to borrow 100 USDT, a platform may require at least 150 USDT worth of ETH or another asset as collateral. If the collateral value drops near 100 USDT due to market fluctuations, the borrower receives a warning and must add more collateral to maintain safety. If they fail, the smart contract triggers automatic liquidation, selling collateral to repay lenders.

In practice, DeFi platforms often impose even stricter standards. When collateral value falls below a warning threshold (typically 130-140% of the loan), the platform issues a warning to the borrower. If it drops below the liquidation threshold (usually 120-125%), the system automatically liquidates part or all collateral to protect lender interests.

Yet, due to crypto’s high price volatility, flash crashes—though infrequent—can still occur. When a “black swan” event causes a sharp, sudden price drop, it can seriously threaten the security and stability of an entire DeFi platform. Additionally, asset theft resulting from smart contract vulnerabilities is still common, leading to significant user losses.

Therefore, users enjoying DeFi’s flexibility, convenience, and attractive returns must also practice prudent capital management. Avoid investing all assets in a single platform, diversify your portfolio, and only invest risk-tolerant capital to prevent severe losses after earning yield.

Summary

Decentralized finance (DeFi) has ushered in a new era for finance by enabling lending relationships via smart contracts, without third-party intervention. This greatly lowers user barriers to entry, eliminates cumbersome procedures, and creates a fairer, more transparent financial system.

The decentralized lending sector continues to evolve rapidly, with innovative models emerging. New products such as leveraged lending, cross-chain lending, and lending insurance solutions are being developed to improve capital efficiency and mitigate risk. With ongoing technological innovation and growing community interest, we believe the DeFi lending market holds enormous growth potential and will continue to play a key role in reshaping the global financial system.

FAQ

What Is Decentralized Lending (DeFi) and How Does It Work?

DeFi is a blockchain-based financial system with no intermediaries. It uses smart contracts, allowing users to lend, borrow, and transact cryptocurrencies directly. DeFi removes the need for traditional banks, offers higher returns, and gives users full control over their assets.

How Does Decentralized Lending Differ from Traditional Lending?

Decentralized lending is more flexible, doesn’t require stringent KYC, and offers fast approval. Traditional lending involves strict credit checks, complex procedures, and longer processing times.

What Are the Main Risks of Decentralized Lending?

Key risks include collateral liquidation from price drops, volatile interest rates, smart contract vulnerabilities, and asset loss if loan terms aren’t managed properly.

How Do I Start Using Decentralized Lending Platforms?

Create a digital wallet, connect to a decentralized lending platform, deposit crypto, select assets to lend or borrow, and start earning high yields or using lending services.

How Are DeFi Lending Interest Rates Determined?

DeFi interest rates are set by market supply and demand and community token voting. Protocols like MakerDAO let the community vote on rates, adjusting them based on market conditions and borrowing demand.

What Are Today’s Leading Decentralized Lending Platforms?

Leading decentralized lending platforms use smart contracts on blockchains such as Ethereum to deliver financial services without intermediaries. These platforms enable users to borrow and lend directly through DeFi technology.