curl -X GET \
  "https://api.buena.ai/api/v2/keys/key_123/stats?period=7d&granularity=day" \
  -H "x-api-key: YOUR_API_KEY"

const response = await fetch('https://api.buena.ai/api/v2/keys/key_123/stats?period=7d&granularity=day', {
  headers: {
    'x-api-key': 'YOUR_API_KEY'
  }
});
const stats = await response.json();

{
  "key_id": "key_123",
  "period": "7d",
  "total_requests": 1250,
  "successful_requests": 1180,
  "failed_requests": 70,
  "usage_by_endpoint": {
    "/api/v2/leads": 450,
    "/api/v2/enrich": 380,
    "/api/v2/linkedin": 420
  },
  "daily_usage": [
    {
      "date": "2024-01-01",
      "requests": 180,
      "successful": 175,
      "failed": 5
    }
  ]
}