Blockchain Development Programming Tutorials, Guides & Best Practices

const axios = require('axios');

// Replace with your actual Etherscan API key
const apiKey = 'YOUR_ETHERSCAN_API_KEY';

// Replace with the Ethereum address you want to query
const address = '0xYourEthereumAddress';

// Etherscan API URL to fetch wallet balance
const url = `https://api.etherscan.io/api?module=account&action=balance&address=${address}&tag=latest&apikey=${apiKey}`;

async function getWalletBalance() {
  try {
    const response = await axios.get(url);
    const balanceInWei = response.data.result;

    // Convert balance from Wei to Ether
    const balanceInEther = balanceInWei / 1e18;
    console.log(`Wallet Balance: ${balanceInEther} ETH`);
  } catch (error) {
    console.error('Error fetching balance:', error);
  }
}

getWalletBalance();

• API: This script sends a GET request to Etherscan's API to fetch the balance of the specified Ethereum wallet.
• Use Case: Ideal for applications needing read-only access to Ethereum data.

• ETH: The native asset of Ethereum, does not conform to any token standard.
• WETH: An ERC-20 token, designed to work seamlessly with Ethereum-based DeFi applications and smart contracts.

• ETH: Used for gas fees, transactions, and interacting directly with the Ethereum network.
• WETH: Primarily used within decentralized applications and protocols that require ERC-20 tokens, such as decentralized exchanges (e.g., Uniswap) or lending platforms.

Once the build is complete, deploy the program using the following command:

anchor deploy

Gas is a fundamental concept in the Ethereum blockchain, serving as the unit that measures the computational work required to execute operations in smart contracts. Every transaction or operation on Ethereum consumes gas, and users must pay for it with Ether (ETH). Understanding how gas works and optimizing your smart contracts to minimize gas consumption is crucial for developing cost-effective and efficient decentralized applications (DApps). This tutorial will guide you through the essentials of gas in Ethereum, strategies for gas optimization, and best practices for writing efficient smart contracts.

Gas is the measure of computational effort required to execute operations on the Ethereum network. Each operation, from simple arithmetic to complex smart contract execution, consumes a specific amount of gas. Users must pay for gas in Ether, which compensates miners for the resources required to process and validate transactions.

• Decentralized: Operates on a blockchain network.
• Open-source: The code is public and available for anyone to view and audit.
• Autonomous: Once deployed, it runs independently without human intervention.
• Smart Contract Integration: Relies on smart contracts to execute transactions and operations.

Before you start building your DApp, you’ll need to set up your development environment. Here’s what you need: