In an effort to help passengers find taxis faster, the Didi Dache app allows you to bid on cabs in your area. Based in China, the app uses a tip bidding system to allocate taxis. Users can choose how much they're willing to tip and how long they're willing to wait. Cabbies can then use the app to accept or deny requests. As a result, those who're willing to pay more get faster service while those who are less generous are made to wait longer.
Didi Dache works using an incremental system. Users can choose a tip of either RMB 5, RMB 10 or RMB 20. If the request isn't successful, the app gives users the choice to increase the tip or wait for a longer period of time.