Web3 & DApp Development Fundamentals · Aula

Visão geral de DeFi

Empréstimos, DEXs e rendimento

Visão geral de DeFi é uma aula grátis de Web3 & DApp Development Fundamentals no CoddyKit. Esta é a aula 1 de 4. Você pode ler a aula completa abaixo gratuitamente — depois pratica ao vivo no navegador com um editor de código integrado e um tutor de IA 24/7. Faz parte do caminho de aprendizado de Web3 & DApp Development Fundamentals, e seu progresso é sincronizado entre a web e o app CoddyKit. O curso de Web3 & DApp Development Fundamentals inclui 4 aulas no total.

Partes desta aula ainda não foram traduzidas e aparecem em inglês.

What Is DeFi?

Decentralized Finance (DeFi) recreates financial services — lending, trading, borrowing, earning interest — using smart contracts on a blockchain instead of banks or brokers.

Anyone with a wallet can use these services permissionlessly, with no account approval and no intermediary holding the funds.

Smart Contracts as the Backbone

Every DeFi protocol is built from smart contracts: self-executing code deployed on-chain. The contract holds the rules and often the funds.

Because the logic is transparent and runs deterministically, users can audit exactly how a protocol behaves before trusting it.

Lending and Borrowing

Lending protocols like Aave and Compound let users deposit assets to earn interest, while borrowers take out loans against collateral.

Loans are overcollateralized: you must lock more value than you borrow, protecting lenders from default.

Deposit:  Alice supplies 1000 USDC -> earns APY
Borrow:   Bob locks 1.5 ETH collateral
          -> borrows 1000 USDC
If collateral value falls -> liquidation

Decentralized Exchanges (DEXs)

A DEX lets users swap tokens directly from their wallets without a centralized order book or custodian.

Most modern DEXs (Uniswap, Curve) use Automated Market Makers instead of matching buyers and sellers.

Yield and Liquidity Provision

Yield is the return earned by putting capital to work. Liquidity providers earn trading fees, lenders earn interest, and stakers earn protocol rewards.

This is the engine that attracts capital into DeFi.

Composability: Money Legos

DeFi protocols are composable — one contract can call another freely. A single transaction can borrow, swap, and deposit across several protocols.

This stacking of building blocks is nicknamed money legos.

tx {
    1. borrow USDC from Aave
    2. swap USDC -> ETH on Uniswap
    3. deposit ETH into a vault
}  // all atomic

Stablecoins

Stablecoins are tokens pegged to a stable value, usually the US dollar. They are the lifeblood of DeFi, used for trading pairs, loans, and savings.

Examples include USDC, USDT, and DAI (which is crypto-collateralized).

Governance and Tokens

Many DeFi protocols issue governance tokens that let holders vote on parameters like fees and supported assets.

This pushes control toward the community and away from a single company — a step toward true decentralization.

Risks in DeFi

DeFi is powerful but risky:

Smart contract bugs — code exploits drain funds
Oracle manipulation — bad price feeds
Liquidation — collateral sold in a crash
Impermanent loss — for liquidity providers

Oracles

Smart contracts cannot read off-chain data on their own. Oracles like Chainlink bring real-world prices on-chain so protocols know an asset is worth.

Reliable oracles are critical — a manipulated price can trigger wrongful liquidations or drain a pool.

Putting It Together

DeFi rebuilds finance as open, composable smart contracts: lending markets, DEXs, stablecoins, and yield strategies, all coordinated by governance and fed by oracles.

Next we focus on the core trading engine: Automated Market Makers.

Quick Check

Test your DeFi fundamentals.

Recap: DeFi Overview

You learned that:

DeFi recreates finance with smart contracts, no intermediaries
Core pieces: lending, DEXs, stablecoins, yield
Protocols are composable money legos
Oracles feed real-world prices on-chain
Risks include bugs, liquidation, and oracle attacks

Next: how AMMs price trades.

Perguntas Frequentes

A aula “Visão geral de DeFi” é grátis?

Sim — o texto completo de “Visão geral de DeFi” é grátis para ler aqui na web. Para praticá-la interativamente (um editor de código integrado e um tutor de IA 24/7) e desbloquear o restante do curso de Web3 & DApp Development Fundamentals, atualize para CoddyKit PRO. O curso de Web3 & DApp Development Fundamentals inclui 4 aulas no total.

O que vou aprender em “Visão geral de DeFi”?

Empréstimos, DEXs e rendimento Você pratica Web3 & DApp Development Fundamentals com código prático que executa diretamente no navegador, e um tutor de IA 24/7 responde suas dúvidas enquanto trabalha na aula.

Preciso ter experiência prévia para começar Web3 & DApp Development Fundamentals?

Nenhuma experiência prévia é necessária. Web3 & DApp Development Fundamentals no CoddyKit é estruturado para alunos iniciantes até avançados, então você pode começar aqui ou desde o início e aprender no seu ritmo. Esta é a aula 1 de 4.

Quanto tempo leva a aula “Visão geral de DeFi”?

A maioria das aulas CoddyKit leva cerca de 5–10 minutos. Cada uma é compacta e interativa, então você faz progresso constante e retoma exatamente de onde parou entre web e app.

Posso escrever e executar código nesta aula de Web3 & DApp Development Fundamentals?

Sim. Cada aula de Web3 & DApp Development Fundamentals inclui um editor de código integrado, então você escreve e executa código real direto no navegador e recebe feedback de IA instantaneamente — nenhuma configuração local necessária.

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