Its new Pay by Flywheel service lets you hail a taxi and pay after you're on your way -- the app uses your phone's motion sensors to tell when you're in mid-ride.
It's theoretically just as speedy as flagging down a conventional taxi, but saves you the hassle of fumbling with your wallet at the very end. The option is available today in every Flywheel area, including the just-added city of Portland.
Source: Flywheel, App Store, Google Play