Free videos with your own Higgsfield key Viblu AI Film Studio works with your own Higgsfield API key. With a free account, single videos in Stage are free on Viblu: Higgsfield bills each render to your own Higgsfield account, and renders on your key never use Viblu credits. Add the key after signing up, in My Account → API Settings. Credits pay for the AI writing work - breakdown, bible, prompts.