FYI, my site (NetToolKit) offers per-request pricing, in increments of $10 (for 100,000 requests): https://www.nettoolkit.com/docs/geo/overview/geocoding -- no monthly fees if you do not make requests.

well the pricing models are per request, but just in easy to understand buckets (small, medium, large). Our experience is most people prefer this as they know exactly what they will spend, there is never a surprising bill.

That said we do have enterprise customers with other pricing models to meet their exact needs. Please get in touch if we can help you.