Abstract: Approaches provide for evaluating lift associated with supplemental content based on a synthetic exposure event. Users may be separated into groups of exposed users that have interacted with supplemental content and an unexposed group that has not interacted with the supplemental content. Users within the unexposed group may be ranked and sorted into a subset control group. The subset control group may be presented with synthetic exposure events that monitor conversions for the supplemental content in the same manner as the exposed group. Thereafter, conversion rates may be compared to determine the impact of the supplemental content.