quicknode-sdk-patterns

# QuickNode SDK Patterns ## Overview Production-ready patterns for blockchain development with QuickNode: provider singletons, retry logic, batch RPC calls, and multi-chain support. ## Prerequisites - Completed `quicknode-install-auth` - ethers.js or @quicknode/sdk installed ## Instructions ### Step 1: Provider Singleton ```typescript import { ethers } from 'ethers'; let _provider: ethers.JsonRpcProvider | null = null; export function getProvider(): ethers.JsonRpcProvider { if (!_provider) { _provider = new ethers.JsonRpcProvider(process.env.QUICKNODE_ENDPOINT, undefined, { staticNetwork: true, // Skip chainId lookup on every call batchMaxCount: 10, // Enable batch RPC }); } return _provider; } ``` ### Step 2: Retry Wrapper with Backoff ```typescript async function withRetry<T>(fn: () => Promise<T>, maxRetries = 3): Promise<T> { for (let attempt = 0; attempt <= maxRetries; attempt++) { try { return await fn(); } catch (err: any) { const isRetryable = err.code === 'SERVER_ERROR' || err.code === 'TIMEOUT' || err.status === 429; if (!isRetryable || attempt === maxRetries) throw err; const delay = Math.min(1000 * Math.pow(2, attempt), 10000); await new Promise(r => setTimeout(r, delay)); } } throw new Error('Unreachable'); } // Usage const balance = await withRetry(() => getProvider().getBalance(address)); ``` ### Step 3: Multi-Chain Client Factory ```typescript const ENDPOINTS: Record<string, ...