Iterate all the markers that the map has (foreach (OnlineMapsMarker marker in OnlineMapsMarkerManager.instance)), calculate the distance from the marker to the target location (OnlineMapsUtils.DistanceBetweenPoints), and take the nearest ones.

P.S.
Your question is not related to the original question at all.
Next time please use your own threads.

You can use any service you like.
But in this case, you will need to make a request and process the response yourself.
It's very easy too.
The mapbox documentation has all the endpoints, request parameters and response fields.
https://docs.mapbox.com/api/search/geocoding/

I would like to do the same as this example

http://infinity-code.com/atlas/online-m … ample.html

but using a mapbox api instead of google api. Is that easily possible somehow?

Thanks,

Jürgen