Jaap Stefels & Itzel Belderbos Share How to Tackle Card Testing Fraud at PyData Amsterdam 2025 🚀

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Card testing is one of the largest growing fraud problems within the payments landscape, with fraudsters launching millions of attempts globally each month. These attacks can cost companies thousands of euros in lost revenue and lead to the distribution of private card details. Detecting this type of fraud is extremely difficult without confirmed labels to train standard supervised ML classifiers. In this talk, we’ll describe how we built a production-ready ML model that now processes hundreds of transactions per second and share the key take-aways from our journey.

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