curl --request GET \
  --url https://api.modal.beeble.ai/v1/account/billing \
  --header 'x-api-key: <api-key>'

{
  "billing_period_start": 123,
  "billing_period_end": 123,
  "hard_limit": 123,
  "prepaid_balance": 123,
  "current_period_usage": 123,
  "meters": [
    {
      "id": "<string>",
      "label": "<string>",
      "unit": "<string>",
      "total_usage": 123
    }
  ]
}