Nekem erre:
https://api.open-elevation.com/api/v1/lookup?locations=41.161758,-8.583933|40,39|65,33
Ezt válaszolta:
{"results": [{"latitude": 41.161758, "elevation": 117, "longitude": -8.583933}, {"latitude": 40.0, "elevation": 1967, "longitude": 39.0}, {"latitude": 65.0, "elevation": 110, "longitude": 33.0}]}