Too Long; Didn't Read
Mapbox, OpenCageData, LocationIQ and GeoCodIO are now using Google's Autocomplete API. Mapbox is not the cheapest of all options, but it strikes a good balance between affordability and data relevance. Google's reporting is hell on earth, but Mapbox's reporting seems to be better than Google's. The company's first 100,000 API calls are free every month, and we'll be paying $0.75 per extra 1000 calls, at a maximum of $94.