Routes
https://digitransit.fi/en/developers/apis/1-routing-api/routes/

Stops
https://digitransit.fi/en/developers/apis/1-routing-api/stops/

Bicycling
https://digitransit.fi/en/developers/apis/1-routing-api/bicycling/

Real-time arrival prediction
https://digitransit.fi/en/developers/apis/1-routing-api/3-realtime-arrival-prediction/

Cancelled trip times
https://digitransit.fi/en/developers/apis/1-routing-api/cancelled-triptimes/

Disruption info
https://digitransit.fi/en/developers/apis/1-routing-api/disruption-info/

Examples
https://digitransit.fi/en/developers/apis/1-routing-api/x-advanced/