API Keys & Setup
Free — sign up at ctabustracker.com, then go to My Account → Developer API to apply.
Free — apply at transitchicago.com/developers/traintrackerapply.
CTA's tracker APIs don't allow direct browser requests, so this page routes them through a public CORS proxy. Your API key and coordinates pass through that proxy — don't use this for anything sensitive.
🚏 Nearby Departures
Set your location to see nearby departures.