curl --request GET \
  --url https://api.oneinbox.ai/v1/usage \
  --header 'Authorization: Bearer <token>'

{
  "calls_made_today": 123,
  "max_calls_per_day": 123,
  "calls_remaining_today": 123,
  "calls_this_month": 123,
  "minutes_used_this_month": 123,
  "cost_cents_this_month": 123,
  "kb_token_budget": 123,
  "period_start": "2023-11-07T05:31:56Z"
}