It is a GT World Challenge America support series, managed by SRO and sanctioned by the United States Auto Club.

SprintX races are 60 minutes in length and feature mandatory driver and tire changes.

[1] For 2021 the original single-driver Sprint races (which ran alongside SprintX) were moved into the multiclass GT America series,[2] which means all GT4 America races preserved the two-driver 60-minute format but dropped the SprintX name.

Beginning in 2019, GT4 America began two regional series integrated into its Sprint X Championship.

The regional series consist of five rounds each in the eastern and western sides of North America in a two-driver, pro-am format.