Every avatar HeyGen bills as studio_avatar, which is the 12 credits/min
row. Photo avatars are excluded, so nothing here can quietly cost $0.99.
Click any card to play its preview. Previews stream from HeyGen and cost
nothing. Judge two things: are the hands in frame, and do they move.
What a preview cannot tell you: how it looks rendered through the API on Avatar III. The one
I did render this way came back static — mouth moving, hands still.