Sports tracker API?

Question

API

Tell me, maybe someone met sports trackers for Android and iOS that have an open API with the ability to upload data? Studied Endomondo, Nike+ - no open APIs.
The task is to hold sports competitions (2-3 per summer), where participants will put a tracker on their phone and register on the site indicating their ID in the tracker. Further, the site will upload data on the participant to be able to compare sports achievements and identify the winner.
For example, a team of cyclists register themselves on the site and turn on their tracker every time they ride. Then, at the end of the month, we upload data for each cyclist by the bike parameter and rank the best.
Writing your own tracker for all platforms under this is not profitable, and it is not necessary, since the reference point is not small groups of people and for holding 2-3 events per season.