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

# Billing and Usage

> Learn about the billing and usage details for SaaS deployments

<Note>
  Alpha features described in this document are provided by Splunk to you "as is" without any warranties, maintenance and support, or service-level commitments. Splunk makes this alpha feature available in its sole discretion and may discontinue it at any time. These documents are not yet publicly available, and we ask that you keep such information confidential. Use of alpha features is subject to the [Splunk Pre-Release Agreement for Hosted Services](https://www.splunk.com/en_us/legal/pre-release-agreement-for-hosted-services.html).
</Note>

## Billing usage for SaaS deployments

Billing usage in Splunk Agent Observability is measured with the following dimensions:

* Spans: The number of agentic spans ingested and analyzed. A span represents a single operation, and related spans make up a trace. [SaaS system limits](#system-limits-for-saas-deployments) include a maximum number of agentic spans per minute.
* Luna tokens: The count of tokens used for Luna evaluation requests. The exact Luna billing calculation is determined by your subscription agreement.

## System limits for SaaS deployments

SaaS deployments have the following system limits that help ensure high performance, stability, and reliability.

| Limit name             | Default limit value | Notes                                                                                                  |
| ---------------------- | ------------------- | ------------------------------------------------------------------------------------------------------ |
| Bytes per minute (BPM) | 5MB per SKU unit    | Also known as trace volume. Spans are dropped after you reach the limit.                               |
| Spans per minute (SPM) | 10                  | Maximum number of spans per minute ingested and analyzed. Spans are dropped after you reach the limit. |

System limits scale with the number of SKU units purchased. For more information, contact your Splunk account team.

## Track subscription usage for SaaS deployments

<Note>
  To view the **Subscription usage** page, you must have the admin or usage role.
</Note>

To view your Splunk Agent Observability subscription usage, follow these steps:

1. From the Splunk Observability Cloud main menu, select **Settings** > **Subscription usage**.
2. Select the **Agent Observability** tab.
3. Use the panels to monitor your usage of traces, spans, total users, and monthly active users. You can filter by project or time period.

For questions about subscription usage, [contact support](https://www.splunk.com/en_us/about-splunk/contact-us.html).