> ## Documentation Index > Fetch the complete documentation index at: https://docs.noxus.ai/llms.txt > Use this file to discover all available pages before exploring further. # How billing works > What your plan includes, what counts as usage, and what happens when a limit is reached Your organization pays a fixed price each month. The price includes two allowances: | Allowance | What it measures | | - | - | | **AI Operations** | How many steps your flows, agents and knowledge bases run. | | **AI model usage** | What your calls to AI models cost. | Usage resets on the first day of each month at 00:00 UTC. The Overview shows the date of the next period. You see both on **Settings → Billing → Overview**. Only people with the **Manage billing** permission can open this page. The Overview tab with the monthly price, the AI Operations usage and the AI model usage ## What counts as an AI Operation * Each **node run** in a flow. A node that runs for 10 items counts 10. * Each **agent reply**, also when it fails or is stopped. * Each **file processed** by a knowledge base, also when a file is updated or processed again. * **Genie** replies. * **Basic nodes**: Input, Output, Fixed Value, Combine Text, List Operations, List to Single Value and Single Value to List. ## What counts as AI model usage * The cost of **model responses** in flows, agents and Genie. * **Estimates** for calls that are still running or have no usage report. * **Background calls**, such as guardrail checks and chat titles. * **Model connection checks**. * **Cached responses**. * **Estimates** for interrupted calls. Depending on your plan, AI model usage counts every model call, only the calls on **Noxus-provided models** (models Noxus serves with its own keys), or only the calls on your own provider keys. ## When you use more than your plan includes | Overview shows | What it means | | - | - | | **Overage allowed** | Extra usage is charged at the displayed rates. Any overage cap still applies. | | **Overage disabled** | New usage is blocked when the allowance is used up. | | **Unlimited included** | This allowance has no plan cap. Your usage controls still apply. | ## Usage controls Set your own limits in **Settings → Billing → Usage controls**. Your plan limits still apply. | Limit | What you choose | | - | - | | **AI Operations limit** | A monthly number of operations for the organization or one workspace. | | **Model provider spend limit** | A monthly budget for the organization or one workspace, covering one provider or all providers. | If your organization uses the Noxus provider, a spend limit can also cover **Noxus-provided models** (every call Noxus serves with its own keys) or **Your own provider keys** (every call on the providers you connected). A new limit includes the usage from earlier in the month. A model call's final cost can take spending above the limit. You can get an email when usage reaches 50, 75, 90, 95 or 98% of a limit. To change a limit, select **Edit** in its row menu. The Usage controls tab with operations limits and model provider spend limits ## When a limit is reached New work that counts toward the limit is blocked. A running flow stops at the next step; the steps before it still count. The run or the chat says that a usage limit was reached. | Limit reached | What to do | | - | - | | **Your usage control** | Select **Manage usage controls**. Delete the limit or replace it with a higher one. | | **Plan limit** | Select **View billing**, or **Speak with us** in a chat. Contact Noxus to request a higher limit. | You can also wait for the limit to reset. Billing managers see the reset date in the dialog. People without the **Manage billing** permission see only that a limit was reached. They do not see the numbers. The limit dialog for an AI Operations limit set under Usage controls ## Why work can be blocked before a limit is used up | Why work was blocked | What to do | | - | - | | Unfinished work holds the remaining allowance. | Try again when that work finishes. | | A model call can never fit in the remaining budget. | Try a cheaper model or ask a billing manager to review the limit. | Before work starts, it holds part of your allowance. Running work holds a batch of AI Operations and uses one for each step. A model call holds the most it could cost, up to USD 1. When the work ends, what it did not use goes back. Near a spend limit, a model call waits up to 60 seconds for other calls to give back their holds before it is refused. A call that costs more than USD 1 still counts its full cost, so spending can go above a limit. ## See also * [Billing analytics](/platform/analytics/billing): what the figures on **Settings → Billing → Analytics** mean. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.