Spend & inference credit

Running a model costs money. ZeroWidth meters that spend against two pools:

• Included inference — an amount that comes with your plan each month. It resets at the start of each UTC month and doesn't roll over.
• Prepaid balance — credit you buy and top up. It persists until you use it.

A run draws down your included amount first, then your prepaid balance. So a light month never touches what you bought, and a heavy month spills smoothly into prepaid credit instead of hard-stopping.

What draws it down

Most spend is work you asked for: running a flow, an eval, an interview, a scheduled routine, a question to zv1, an agent working something out in a sidebar.

Rooms also do a little on their own. When someone writes in a room, ZeroWidth looks at what was said — to see whether one of the room's AI members was being asked for something, to catch a decision worth keeping, to notice when a side conversation has reached its answer, and to keep the room's summary current. Nobody presses a button for any of that, and it's metered like everything else.

It's deliberately small and deliberately bounded. The check that runs most often — whether anyone was being asked — costs a tiny fraction of a cent, because it's a classifier rather than a language model; the fuller work only happens when that check says someone was. Each room does a limited amount of this per hour, and your workspace has its own limit across all its rooms. A room that reaches its limit stops doing this background work until the hour turns, and everything a person asks for keeps working normally.

Topping up

Add credit from the billing page — pick an amount and pay through a one-time Stripe checkout. The balance updates once the payment settles, and it's there for whenever your included amount runs out.

Alerts and what happens at zero

As your balance gets low, ZeroWidth notifies the workspace's billing managers — a heads-up before anything stops. If both the included amount and the prepaid balance are exhausted, flow runs stop with a quota error until you add credit (or your monthly amount resets). Enterprise workspaces run against their contracted cap instead.

The billing page keeps a credit history — top-ups and daily usage — so you can see where the spend went.