Does PicX Studio require a subscription, or can I pay as I go?

Both work. You can start free — your first image is on us. After that, one-time credit packs from $5 (500 credits) need no subscription, and their credits never expire. Monthly plans from $11.99 (3,600 credits) give you a much lower price per credit, and either one covers video generation; you can cancel anytime and keep the credits already granted. See pricing.