alchemy-install-auth

# Alchemy Install & Auth ## Overview Install the `alchemy-sdk` npm package and configure API authentication. Alchemy provides blockchain infrastructure (RPC nodes, Enhanced APIs, NFT APIs, webhooks) across Ethereum, Polygon, Arbitrum, Optimism, Base, and Solana. ## Prerequisites - Node.js 18+ (or Python 3.10+ for alchemy-sdk Python) - Free Alchemy account at [alchemy.com](https://www.alchemy.com) - API key from Alchemy Dashboard ## Instructions ### Step 1: Install the Alchemy SDK ```bash # JavaScript/TypeScript (official SDK) npm install alchemy-sdk # Python (community SDK) pip install alchemy-sdk ``` ### Step 2: Create an Alchemy App 1. Go to [dashboard.alchemy.com](https://dashboard.alchemy.com) 2. Click "Create new app" 3. Select chain: Ethereum, Polygon, Arbitrum, Optimism, Base, or Solana 4. Select network: Mainnet, Sepolia (testnet), or Mumbai 5. Copy the API key ### Step 3: Configure Environment ```bash # Set environment variable export ALCHEMY_API_KEY="your-api-key-here" # Or create .env file cat > .env << 'EOF' ALCHEMY_API_KEY=your-api-key-here ALCHEMY_NETWORK=ETH_MAINNET EOF echo ".env" >> .gitignore ``` ### Step 4: Initialize and Verify ```typescript // src/alchemy-client.ts import { Alchemy, Network } from 'alchemy-sdk'; const alchemy = new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.ETH_MAINNET, }); // Verify connection async function verifyConnection() { const blockNumber = await alchemy.core.getBlockNumber(); consol...