curl "https://api.mor.org/api/v1/billing/usage/month?year=2026&month=5&limit=20" \
  -H "Authorization: Bearer sk-your-api-key"

{
  "items": [
    {
      "id": "0192a1b2-c3d4-7890-abcd-ef1234567890",
      "created_at": "2026-05-15T09:12:00Z",
      "model_name": "llama-3.3-70b",
      "endpoint": "/api/v1/chat/completions",
      "tokens_total": 512,
      "amount_paid": "0.00",
      "amount_staking": "0.0088",
      "amount_total": "0.0088"
    }
  ],
  "total": 42,
  "limit": 20,
  "offset": 0,
  "has_more": true
}