<?php
$json = '{"result":{"stats":[{"balance":"1","rejected_speed":"0","accepted_speed":"0"},{"balance":"2","rejected_speed":"0","accepted_speed":"0"},
{"balance":"3.00038357","rejected_speed":"0","accepted_speed":"0"}]}}';
echo array_sum(array_column
($data->result->stats, 'balance'));
PD9waHAKCiRqc29uID0gJ3sicmVzdWx0Ijp7InN0YXRzIjpbeyJiYWxhbmNlIjoiMSIsInJlamVjdGVkX3NwZWVkIjoiMCIsImFjY2VwdGVkX3NwZWVkIjoiMCJ9LHsiYmFsYW5jZSI6IjIiLCJyZWplY3RlZF9zcGVlZCI6IjAiLCJhY2NlcHRlZF9zcGVlZCI6IjAifSwKeyJiYWxhbmNlIjoiMy4wMDAzODM1NyIsInJlamVjdGVkX3NwZWVkIjoiMCIsImFjY2VwdGVkX3NwZWVkIjoiMCJ9XX19JzsKJGRhdGEgPSBqc29uX2RlY29kZSgkanNvbik7CmVjaG8gYXJyYXlfc3VtKGFycmF5X2NvbHVtbigkZGF0YS0+cmVzdWx0LT5zdGF0cywgJ2JhbGFuY2UnKSk7