I wanted to use some larger models in my local ComfyUI workflows but I'm too gpu poor. Currently the only model supported is Flux (schnell, dev, and pro) but I'll probably add more when I find the time.

Setup

Install the extension with the "Install via Git URL" option in comfyUI manager
Create an account at fal.ai
Go to https://fal.ai/dashboard/keys and click "Add key"
Name the key then copy it into a text file in the ComfyUI-fal-api/keys folder. (there is a placeholder nokey.txt file which you can delete)
Consult the models page to get an idea of how much each generation will cost
Go to https://fal.ai/dashboard/billing and top up your account. For your financial well-being I recommend against automated topups, but I can't stop you.