What's the best global address verification API you've used?

Of the half dozen or so I tested (not super scientifically, but with a moderately sized sample dataset that I ran through several APIs), Smarty seemed to be the most accurate: https://www.smarty.com/

It was expensive though.

And there's the Google Maps API, of course:https://developers.google.com/maps/documentation/address-val...

I thought Maxmind was the gold standard or am I old?

here.com is good also radar.io