{
  "error": "Rate limit exceeded. Please slow down your requests.",
  "code": "RATE_LIMITED",
  "retryAfter": 12
}

async function retryOnRateLimit(fn: () => Promise<Response>, maxRetries = 3) {
  for (let i = 0; i < maxRetries; i++) {
    const response = await fn();
    if (response.status === 429) {
      const retryAfter = parseInt(response.headers.get('Retry-After') || '5', 10);
      await new Promise((r) => setTimeout(r, retryAfter * 1000));
      continue;
    }
    return response;
  }
  throw new Error('Rate limited after max retries');
}