As the debate over sports betting heats up in Oklahoma, the Chickasaw Nation is rolling the dice on a different type of gambling.

The southern Oklahoma tribe is launching a mobile gaming app that will take and pay out real money, a change from phone games where no cash changes hands. It will only work at the Winstar World Casino and Resort in Thackerville, the tribe’s largest gaming hub near the Oklahoma-Texas line.

Even with that limitation, the new app is significant, because most forms of online wagering are not yet legal in Oklahoma. It could give the Chickasaw Nation an early foothold in the fast-growing mobile gaming world.