AbstractWe examine the impact of changes in real‐time data access fees on price discovery in the crude oil futures market. Specifically, we examine differences in price discovery in the West Texas Intermediate crude oil futures contracts traded on two exchanges around three events corresponding to changes in real‐time data access fees. We document a decrease in price discovery following two events that increase data access costs. These findings are consistent with the theoretical predictions of Cespa and Foucault that increases in data access costs reduce the number of market participants trading on real‐time data and adversely impact price discovery.