Shout out to Namma Yatri [1] app in Bengaluru, India. It is developed by a payments startup called Juspay. It is endorsed by the Auto Rickshaw Drivers Union. It was launched in November of 2022 and has since done about 5m rides and drivers have earned 9m USD [2]. The entire app, backend and protocol is completely open source [3]. Seems like it uses a fair bit of Haskell and Nix!

[1] https://www.nammayatri.in

[2] https://www.nammayatri.in/open/

[3] https://github.com/nammayatri