Thanks ! > where "top-k" is the number of results they want back. Some systems will do that, so I get the confusion. I think the YouTube API for instance has

Thanks ! > where "top-k" is the number of results they want back. Some systems will do that, so I get the confusion. I think the YouTube API for instance has a quota system that takes internal operations into account, so getting back 10 results in a query effectively weights 10+ credits. I better understand the kind of issues you are facing, as these kind of subtilities are inherently hard to explain. For better or worse, that's another advantage of starting with a small trial account and actually see how the operations are billed for typical operations.