DeFi Explained: The Structure and Risks of Decentralized Finance

DeFi is a financial system that automatically handles deposits, loans, and exchanges on a blockchain without intermediaries such as banks. This beginner guide explains the core structure and actual risks.

What Is DeFi?

DeFi means Decentralized Finance. Instead of intermediary institutions such as banks or securities firms, programs on a blockchain, or smart contracts, automatically process financial transactions such as deposits, loans, and currency exchanges. A company manages the records in traditional finance, while DeFi lets anyone publicly inspect code and transaction records.

Most DeFi services run on smart-contract-capable chains such as Ethereum and primarily use native coins or price-pegged stablecoins. Users directly connect a personal wallet and take responsibility for asset custody.

Smart Contracts Are the Core

Smart contracts power DeFi. Rules specifying what happens when a condition is met are written in code and execute without human approval. For example, code can specify automatic liquidation if collateral value falls below 110% of the borrowed amount.

Advantages include continuous 24-hour operation, automatic execution, and transparent records. The main weakness is that buggy code also executes as written. Executed transactions are difficult to reverse, and there is no customer-service refund request.

Main Services: Deposits, Loans, Swaps, and Yield Farming

• Deposits: Depositing coins into a protocol earns interest. This resembles a bank deposit, but rates change frequently with demand.
• Lending and borrowing: Assets serve as collateral to borrow other coins. DeFi generally requires overcollateralization, for example 150%, and automatically liquidates when collateral falls below the threshold.
• Swaps: A decentralized exchange instantly exchanges coin A for coin B. Prices come from liquidity pools and formulas instead of an order book.
• Yield farming: Supplying liquidity earns trading fees and reward tokens. Even a high advertised APY can produce much lower actual returns because of falling reward-token prices and impermanent loss, described below.

Essential Risks to Understand

DeFi carries clear loss risks alongside return opportunities. The following occur frequently in practice.

1. Hacking and code vulnerabilities: Attacks exploiting smart contract weaknesses repeatedly drain pools each year. Even audited protocols are not 100% safe.
2. Rug pulls: Developers collect investor funds, remove liquidity, and disappear. Anonymous teams, unrealistic return promises, and unverified new tokens increase the risk.
3. Impermanent loss: When two assets are deposited into a pool, diverging price ratios can leave the position worth less than simply holding them.
   Example Suppose you deposit 1 ETH worth $3,000 and 3,000 USDC. If ETH rises to $4,000, the pool automatically sells ETH to rebalance. The withdrawn position can then be worth less than holding the assets, and earned fees may not cover the difference.

Other risks include forced liquidation of loan collateral during rapid price changes, stablecoin depegging, and high network fees. DeFi does not guarantee returns, and total principal loss is possible. A safer approach uses money you can afford to lose, small tests, and sufficient prior research.