DeFi Explained
DeFi — decentralized finance — is a set of financial services built on blockchains that anyone can use without a bank or broker. Instead of a company holding your money, code (smart contracts) enforces the rules. This guide explains how DeFi works, the main services, and the risks.
What Is DeFi?
Decentralized finance replaces intermediaries — banks, exchanges, brokers — with smart contracts on public blockchains, mostly Ethereum. Anyone with a wallet and internet access can lend, borrow, trade, and earn interest. All activity is public and verifiable on-chain.
Core DeFi Services
- Lending and borrowing — Protocols like Aave and Compound let you deposit assets to earn interest or borrow against your holdings with overcollateralization.
- Decentralized exchanges (DEXs) — Uniswap and similar protocols use automated market makers (AMMs) so anyone can swap tokens without a matching order book.
- Stablecoins — Dollar-pegged assets (USDC, USDT, DAI) provide a stable unit of account and the base currency for most DeFi activity.
- Yield and staking — You can earn yield by staking proof-of-stake assets or providing liquidity to pools.
- Derivatives and insurance — Perpetual futures, options, and coverage protocols extend traditional finance onto the blockchain.
How to Get Started
- Buy ETH or a stablecoin on a reputable exchange.
- Set up a non-custodial wallet like MetaMask and never share your seed phrase.
- Bridge or transfer assets to the same network the protocol runs on.
- Start small — test a lending protocol or DEX swap with an amount you can afford to lose.
- Check protocol audits and TVL (total value locked) before depositing.
Key Risks
- Smart contract exploits — hacks have drained billions from DeFi protocols.
- Impermanent loss — providing liquidity can lose value relative to just holding.
- Volatility and liquidation — leveraged positions can be liquidated in seconds.
- Scams and rug pulls — anonymous teams can drain liquidity pools.
- Regulatory uncertainty — DeFi rules are still being defined worldwide.