curl --request GET \
  --url https://api.production.hyperoru.com/api/hyperliquid/accounts/{account_id}/balance \
  --header 'Authorization: Bearer <token>'

{
  "available": 123,
  "environment": "<string>",
  "exchange": "<string>",
  "total_equity": 123,
  "margin_used": 123,
  "unrealized_pnl": 123
}