Форматирование дампа, позволяет не задавать таких "глупых" вопросов
Вот так же намного лучше и сразу понятно структуру массива
Array (
[data] => Array (
[ActionsResult] => Array ( )
[Accounts] => Array (
[0] => Array (
[Login] => pl4tpass
[Discount] => 0
[Currency] => RUB
[AmountAvailableForTransfer] => 0
[SmsNotification] => Array (
[MoneyOutSms] => No
[PausedByDayBudgetSms] => Yes
[SmsTimeTo] => 21:00
[MoneyInSms] => No
[SmsTimeFrom] => 09:00
)
[Amount] => 0
[AgencyName] =>
[EmailNotification] => Array (
[SendWarn] =>
[MoneyWarningValue] => 20
[PausedByDayBudget] => Yes
[Email] => pl4tpass@yandex.ru
)
[AccountID] => 49797112
)
)
)
)
И сразу понятно как добраться до баланса
$balance['data']['Accounts'][0]['Amount']