On October 10, Toss Bank experienced a critical error that resulted in Japanese yen being traded at approximately 472 KRW per 100 yen, which is about half of the normal market rate of around 934 KRW. This anomaly lasted for approximately seven minutes, during which some users took advantage of the significantly lowered price to purchase yen automatically. At the same time, the app's automatic exchange rate notification indicated that this was the lowest rate in the past three months, further incentivizing users to exchange yen during this period.

Toss Bank recognized the issue shortly after it occurred and temporarily suspended transactions involving yen exchange. By around 9 PM, the bank reported that services had returned to normal. The bank has since stated that the incorrect rates were due to internal checks, and they are currently assessing the scale of the transactions that took place during the error. This incident raises concerns about software reliability and user trust, especially in financial services where accurate exchange rates are crucial.

As the situation unfolds, customers who may have purchased yen at the erroneous rate may have expectations for reimbursement or further communication from Toss Bank. The implications of this error could affect customer loyalty and the bank's reputation in the competitive financial landscape of South Korea, where fintech solutions like Toss Bank are increasingly popular among consumers.