GMO Aozora Net Bank announced on November 11th that its banking API, which had been temporarily suspended after detecting unauthorized communication from external sources, was resumed at 6:25 AM on the same day. At cryptocurrency exchange Binance Japan, deposits and withdrawals of Japanese Yen via the bank became temporarily unavailable.
Banking APIs are mechanisms that allow external services to connect with a bank's system to perform tasks such as checking deposit/withdrawal statements and making transfers. The bank initially halted the API at 8:42 PM on the 10th for security reasons, then resumed it at 10:30 PM. Subsequently, it detected unauthorized communication again and re-halted the API at 1:02 AM on the 11th. In an announcement made at 6:30 AM on the 11th, the bank stated that it had confirmed security and resumed operations, explaining that no personal information leaks or unauthorized fund outflows had occurred.
In its suspension notice on the 10th, Binance Japan explained that while Japanese Yen deposits and withdrawals via GMO Aozora Net Bank were unavailable, deposits and withdrawals via PayPay Money and Docomo SMTB Net Bank remained accessible. Later that evening, it announced the resumption of deposits and withdrawals via GMO Aozora Net Bank, adding that any deposit/withdrawal operations made during the suspension would be reflected sequentially.
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