Rate Limiting

async function requestWithRetry(url, options, maxRetries = 3) {
  for (let i = 0; i < maxRetries; i++) {
    const response = await fetch(url, options);
    
    if (response.status === 429) {
      const retryAfter = response.headers.get('Retry-After') || Math.pow(2, i);
      await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
      continue;
    }
    
    return response;
  }
  throw new Error('Max retries exceeded');
}

const cache = new Map();
const CACHE_TTL = 30000; // 30 seconds

async function getCachedBalance() {
  const cached = cache.get('balance');
  if (cached && Date.now() - cached.timestamp < CACHE_TTL) {
    return cached.data;
  }
  
  const data = await fetchBalance();
  cache.set('balance', { data, timestamp: Date.now() });
  return data;
}