curl --request GET \
  --url https://api.gridcertainty.com/v1/api_usage \
  --header 'x-api-key: <api-key>'

{
  "plan": "<string>",
  "requests_today": 123,
  "requests_this_month": 123,
  "limit_per_day": 123,
  "limit_per_month": 123
}