Velocity

In antifraud and risk management, velocity is the rate at which transactions or activities happen within a set time frame. Teams use it to spot normal patterns, out-of-pattern behaviour, and signals of potential fraud.

Example

An online retailer might monitor transaction velocity, such as the number of purchases made by one user or from one IP address over a short period. A customer may usually make one or two purchases in a week, then suddenly place six orders in 10 minutes. That shift can point to a stolen card being used before it is blocked. But context matters. During seasonal periods such as Christmas, normal behaviour often changes, and higher velocity may be expected. If teams rely on rigid business rules with no allowance for seasonality, they can reject legitimate customers who are simply shopping out of their usual pattern. Monitoring and analysing transaction velocity helps businesses find suspicious activity faster, reduce fraud risk, and avoid damaging good customer experiences with rules that are too simple for real-world behaviour.