MBTA API. The new V3 API provides fast, easy access to MBTA schedules, alerts, and real-time information. The V3 API uses the JSON API format, so you can get started quickly using any of the available libraries V3 API documentation is available using Swagger You can try it out without a key, but we strongly recommend using a key early in the development process. Keys are available for free at api-v3.mbta.com. The V3 API data model is based on GTFS and GTFS-realtime where applicable. The following calls are available: alerts facilities - elevators, escalators, and (coming soon) parking lots, bike racks, etc. predictions - predicted arrival/departure times routes schedules - scheduled arrival/departure times (stop_time) shapes - stops and maps for branches, including route variations stops trips vehicles - vehicle positions