This tutorial aims to equip you with the basic knowledge and skills needed to get started with Decentralized Finance (DeFi) platforms.
By the end of this tutorial, you should be able to:
Basic understanding of Ethereum's blockchain, smart contracts, and programming languages like JavaScript would be useful but not strictly necessary.
DeFi stands for "Decentralized Finance". It is an umbrella term for financial services on public blockchains, primarily Ethereum. DeFi users can lend or borrow funds, speculate on price movements on a range of assets using derivatives, trade cryptocurrencies, insure against risks, and earn interest in savings-like accounts.
To interact with a DeFi platform, you will need a web3 provider like Metamask, which allows you to make transactions on the Ethereum network.
DeFi platforms offer a variety of protocols. These protocols can be thought of as open-source software that anyone can use. For instance, you can interact with protocols like Uniswap for token swapping or Compound for interest earning.
const Web3 = require('web3');
// Initialize a Web3 instance using Metamask's provider
const web3 = new Web3(window.ethereum);
// Request account access
async function getAccount() {
const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });
return accounts[0];
}
The above code snippet is for initializing a Web3 instance and requesting account access using Metamask.
const ethers = require('ethers');
// Connect to the network
let provider = ethers.getDefaultProvider('mainnet');
// Connect to the Uniswap contract
let contractAddress = "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D"; // Uniswap address
let uniswap = new ethers.Contract(contractAddress, [], provider);
The above code snippet connects to the Ethereum mainnet and creates a contract instance for Uniswap.
In this tutorial, you learned about DeFi platforms, how to connect to these platforms using a web3 provider, and how to interact with DeFi protocols. You also got hands-on experience with code examples.
To expand your knowledge, you could explore different DeFi protocols and learn how to interact with them. You might also want to learn more about smart contracts and the Solidity programming language.
Exercise 1: Connect to a different DeFi platform using web3.js.
Exercise 2: Interact with a different DeFi protocol using ethers.js.
Exercise 3: Write a function that retrieves the balance of a specific token using ethers.js.
Solutions:
We encourage you to find the solutions yourself as it is a part of the learning process. However, if you are stuck, you can refer to the Ethereum and ethers.js documentation provided in the additional resources.
Tips for Further Practice
Try to explore other DeFi platforms and protocols. Also, learn about yield farming and liquidity mining in DeFi.