Connect to API runkeeper for km data

Hello CodeCrew,

I am building an app that uses kilometers/miles data from apps like Runkeeper and Strava.
How do you connect your app with these companies? Is there an API for these apps?
And is it expensive?

You’d have to google and looking into these specific services like “run keeper API”

Some APIs are paid, others are free, it all depends what that company/developer want to do