Oops, that's what I get for not reading closely enough! In my defense, my eyes glazed over after the fourth Apple-product-OS version number ;) but yes, my bad on that

Looks like it's 500k calls per month per Apple Developer Program account, so essentially $99/yr. Not totally unreasonable pricing, although I wish I could buy it a la carte. It's a bit out of my price range for hobby projects. If I ever start developing apps for my family members (who mostly have iPhones at this point) though this will be a nice freebie to come with that. Ah well.