Science & Tech · AI · 2 hrs ago
K Bank uses AI to flag suspicious transactions by teenagers
South Korean bank K Bank has added AI checks designed for teenage customers to its system for detecting suspicious financial activity.
The change responds to concerns about illegal gambling among teenagers; 4,715 minors were arrested for illegal gambling in 2024.
Earlier checks were built around adults, whose transactions are typically larger and whose activity patterns differ from teens'.
K Bank's system looks at small, repeated transactions at vulnerable late-night hours, as well as amounts, merchants, transfer recipients and device information.
Because young customers often have little account history, the system compares them with typical patterns among teenage customers and learns from cases flagged for review.
From July to September, it monitored about 180,000 teen transactions during late-night hours and flagged about 1,800 as suspicious, without establishing that they involved crime or harm.
K Bank says it plans to expand automated responses as accuracy improves and review how information is shared between parents and children.
K Bank has added artificial intelligence-based detection rules for transactions by minors to its fraud detection system.
The system looks for patterns such as repeated small transactions at night, which adult-focused rules could miss.
From July to September this year, it monitored about 180,000 transactions by minors during vulnerable overnight hours and flagged about 1,800 as suspicious.
The system was developed after concerns about youth illegal gambling and a recommendation to strengthen protections for minor customers.
K Bank plans to expand automated responses as its data improves and to review how financial information is shared between parents and children.
- Who
- K Bank, including its product, fraud-response and data teams.
- What
- It developed an AI-supported fraud detection system with rules tailored to minors’ transactions.
- When
- The system was built over about five months. It monitored transactions from July to September this year.
- Where
- South Korea.
- Why
- Existing fraud detection rules were designed for adults and could miss minors’ small, frequent or overnight transactions, amid concerns about illegal youth gambling.
This story does not have two clearly opposing sides.
A total of 4,715 minors were arrested for illegal gambling during the year.
K Bank teams built the system after an internal committee recommended stronger protections for minor customers.
The system monitored about 180,000 transactions by minors during vulnerable overnight hours and flagged about 1,800 as suspicious.
Jang Ji-eun received an individual award from the Financial Services Commission for her contribution to building the tailored system.
- Monitoring period
- July–September this year
- Transactions monitored
- About 180,000 minor transactions during vulnerable overnight hours
- Flagged as suspicious
- About 1,800 transactions, or 1%
- Minor arrests for illegal gambling
- 4,715 in 2024
- Build time
- About five months
What people are saying
I thought that, because I am in a position to see the transactions of teenage customers most closely, I should look at the risks that could arise during use as well as the convenience and benefits of the products.
We cannot conclude that these were actual crimes or cases of harm, but we see value in filtering out risk signals that are not visible on the surface in advance.
We used the general usage patterns of all minor customers as the standard.