Three common pricing shapes
AI credits pricing usually falls into three shapes. First, subscriptions with monthly allotments: you pay a flat fee and receive messages, “fast” hours, or platform credits that reset on a schedule. Second, prepaid packs and top-ups: buy a bucket of credits when you need a burst, sometimes with long expiry. Third, pure usage billing: attach a card and pay for tokens, images, or seconds as you go.
Many vendors combine shapes—a free tier plus paid packs, or a subscription with overage at list rates. When you land on /ai-credits or /api-credits, identify the shape before comparing headline numbers. A $20 chat plan and a $20 API voucher fund completely different workflows.
This guide is about reading pricing honestly across a broad catalog of labs and tools, not about declaring a single winner brand.