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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

  1. Buy ETH or a stablecoin on a reputable exchange.
  2. Set up a non-custodial wallet like MetaMask and never share your seed phrase.
  3. Bridge or transfer assets to the same network the protocol runs on.
  4. Start small — test a lending protocol or DEX swap with an amount you can afford to lose.
  5. 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.

Further Reading