> ## Documentation Index
> Fetch the complete documentation index at: https://docs.moxus.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Billing

> Understand quota, top-ups, invoices, usage logs, and cost calculation in Moxus AI.

Model calls consume account quota. Costs depend on the selected model, input size, output size, billing mode, and account group multiplier.

## Quota sources

* Trial quota for new accounts, if enabled.
* Online top-up through supported payment methods.
* Redemption codes issued by the platform.

## Cost calculation

```text theme={null}
cost = (input tokens x input price + output tokens x output price) x group multiplier
```

Some multimodal or task-based models charge per call instead of by token count.

## Next steps

* [Models and pricing](/en/overview/models-and-pricing)
* [Dashboard and usage](/en/platform/dashboard-and-usage)