TransportAPI is a data-as-a-service company that provides transportation data to apps and websites using industry sources like Travelline, Network Rail, and Tfl. The TransportAPI uses REST calls and has a variety of endpoints. Users can make calls to get data on bus routes and times, London underground transit info, and several public trip planners. The API is already being used for live bus departure services, and UK travel option applications. An account is required with service.