escada
(Escada)
2
Which API are you talking about? The APIs on osm.org are not meant for this purpose, they are meant for editing. You could use one of the Overpass instances, but it would even be better to deploy your own server with OSM data.
None of the osm.org, nor Overpass servers guarantee a 24/7 service and all might come with a usage policy with limits on the number of requests.
Note that you cannot buy a license that allows you to bypass any of those limitation.