# Account & Billing

CloudSigma uses **Credit** as its unified billing unit. AI Studio and OmniFabric consume Credit from the same CloudSigma account balance.

Use Billing Center to review the available balance, understand where Credit is being consumed, trace balance changes, and add Credit when required.

## Billing records

Billing Center presents several types of records. Each answers a different question:

| Record | Use it to answer |
| --- | --- |
| Cost overview | How much Credit remains, and how is consumption changing? |
| Usage details | Which product, workspace, instance, or billable item consumed Credit? |
| Transaction details | Why did the account balance change? |
| Monthly bills | How much Credit was consumed during a billing period? |

Usage records explain why Credit was consumed. Transaction records explain why the account balance changed. Do not treat them as the same record.

## Recommended path

1. Read [Credits and billable items](https://omnifabric.cloudsigma.com/docs/guides/billing/credit-and-pricing.html.md) to understand the billing fields.
2. Use [View costs and usage](https://omnifabric.cloudsigma.com/docs/guides/billing/cost-and-usage.html.md) to review the balance and trace consumption.
3. Use [Top up Credits](https://omnifabric.cloudsigma.com/docs/guides/billing/manage-billing.html.md) when the account needs additional Credit.
4. Review [Bills and invoices](https://omnifabric.cloudsigma.com/docs/guides/billing/invoices.html.md) for billing-period summaries and any documents available to the account.
5. Read [OmniFabric billing](https://omnifabric.cloudsigma.com/docs/guides/billing/matrixone-billing.html.md) when investigating a database instance cost.

## Documentation tree