On the evening of March 10, 2026, users of Toss Bank’s digital platform in South Korea were treated—albeit briefly—to what some called a “half-price yen sale.” For about seven minutes, the app displayed the Japanese yen at a jaw-dropping 472 won per 100 yen, roughly half of the prevailing market rate, which hovered around 930 to 934 won per 100 yen that day. The error, which occurred during an internal system inspection, left some users celebrating unexpected windfalls while Toss Bank scrambled to contain the fallout and investigate the root cause.
According to multiple Korean news outlets, including Chosun Ilbo, Digital Today, YTN, and Global Economic, the glitch was first noticed around 7:29 PM KST. For a brief but consequential seven-minute window, the app allowed users to exchange Korean won for Japanese yen at the erroneous rate. Some customers, who had set up automatic purchase orders in advance, managed to complete transactions at this dramatically reduced price. As one user reportedly exclaimed online, “I set up automatic exchange and hit the jackpot!”
Toss Bank quickly acknowledged the error. In a public notice, the company said, “We are identifying and resolving the detailed cause of the exchange rate display error that occurred today.” A spokesperson elaborated to Digital Today, “During an internal inspection, there was a situation where the exchange rate display was not normal for seven minutes. We are currently in the normalization stage and are thoroughly identifying the cause.” The bank also issued an apology, stating, “We sincerely apologize for the inconvenience caused to customers and will thoroughly inspect and improve our systems to prevent a recurrence.”
As the error unfolded, Toss Bank took swift action to limit further disruption. The company temporarily suspended yen exchange transactions and, in certain cases, froze customer accounts that had benefited from the glitch. The incident was reported to South Korea’s Financial Supervisory Service, and the bank said it was “closely investigating the cause and the exact scale of the affected transactions.” On the sensitive question of whether it would attempt to recover the mistakenly exchanged funds, Toss Bank told YTN that “measures regarding refund or recovery of the erroneous transactions are under internal discussion.”
For those who managed to complete exchanges at the discounted rate, the windfall was real—at least for now. Online communities buzzed with stories of users who received push notifications from Toss Bank about the “lowest ever” yen price and rushed to take advantage. Some even posted screenshots of successful transactions, stoking a mix of envy and disbelief among other customers. The rate discrepancy was glaring: with the yen trading at about 933 to 934 won per 100 yen in the broader market, the 472 won rate represented a 50.5% discount, according to Global Economic.
The episode is not the first time a major Korean fintech platform has suffered a costly currency exchange mishap. Chosun Ilbo recalled a September 2022 incident in which Toss Securities, a sister company, incorrectly applied a favorable dollar-to-won exchange rate for 25 minutes. At the time, the dollar was trading above 1,440 won, but the platform allowed exchanges at 1,290 won, enabling many customers to pocket substantial gains. Notably, Toss Securities did not attempt to claw back those profits, a decision that may weigh on Toss Bank’s current deliberations.
Such errors are not unique to Toss Bank. In February 2026, cryptocurrency exchange Bithumb made headlines after mistakenly crediting winners of a promotional event with 620,000 bitcoins—over twelve times the amount the company actually held. The error stemmed from a misentry, where the payout unit was entered as “bitcoin” rather than “won,” resulting in a massive and unintended windfall for some lucky recipients.
Back to the Toss Bank incident, the company’s rapid response did not go unnoticed. Within minutes of recognizing the error, the bank suspended yen exchange transactions and began freezing accounts involved in the anomalous trades. Customers attempting to access the foreign exchange service were met with a system maintenance notice as the team worked to restore order. By around 7:36 PM, the yen exchange rate had returned to normal, and the system was operational once again, according to News1.
For the bank, the focus now shifts to damage control and restoring customer trust. The company emphasized its commitment to transparency, noting that it had reported the incident to financial regulators and was “thoroughly verifying the cause and scale of the affected trades.” As for whether users who profited from the glitch will be allowed to keep their gains, Toss Bank said it would make a decision after internal discussions and consultations with authorities.
The event has reignited debate about the vulnerabilities of digital financial platforms, especially as more South Koreans turn to fintech services for everyday transactions. The speed and automation that make these platforms attractive also mean that errors—when they occur—can spread rapidly and have significant financial consequences. Industry observers note that while system inspections and upgrades are essential, they also introduce risks if not carefully managed.
For customers, the incident is a reminder that technology, for all its convenience, is not infallible. As one Toss Bank official candidly admitted, “We sincerely apologize for any inconvenience caused to our customers and will do our utmost to ensure this does not happen again.”
Meanwhile, the Financial Supervisory Service is expected to scrutinize Toss Bank’s handling of the error, given the potential for market disruption and customer losses. The regulator’s response may set a precedent for how similar incidents are addressed in the future, particularly as fintech platforms continue to play a larger role in the country’s financial ecosystem.
In the wake of this high-profile mishap, Toss Bank faces a critical test—not just of its technical systems, but of its ability to communicate transparently and act fairly toward customers. As the investigation unfolds, all eyes will be on how the bank balances accountability, customer relations, and regulatory compliance. For now, the “half-price yen” moment has passed, but its impact on Korea’s digital finance landscape is likely to linger.