curl --request GET \
  --url https://api.example.com/usage \
  --header 'Authorization: Bearer <token>'

{
  "plan_type": "free",
  "period": "<string>",
  "session_count": 123,
  "function_count": 123,
  "browser_usage_cost": 123,
  "proxy_usage_cost": 123,
  "llm_usage_cost": 123,
  "function_usage_cost": 123,
  "total_cost": 123,
  "subscription_limit_amount": 123,
  "topup_limit_amount": 123,
  "subscription_balance_amount": 123,
  "topup_balance_amount": 123,
  "balance_amount": 123,
  "is_usage_limit_exceeded": true
}