Knull's AI work runs on one currency: Knull Credits (KC). Every priced action shows its KC cost before it runs, and every completed action leaves a receipt you can trace.
| What you do | How it's billed |
|---|---|
| AI work | KC — research, writing, analysis, images, video, skills, browser sessions. |
| Ad spend | Paid directly to the ad platform on your own connected account. Knull takes no cut and never fronts ad money. |
Each plan (Free, Starter, Pro, Scale) includes a monthly allocation. You can top up anytime — there's a balance in the top bar that's always one click from a refill — and turn on auto-top-up so you never run dry mid-task. When you're running low, Knull warns you visually and drops a card in your Inbox before anything breaks.