> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/feature-management-experimentation/management-and-administration/account-usage.md).
# Usage Data
This page describes the usage reports, billing details, and service limits available in Harness Feature Management & Experimentation (FME). Navigate to the **Usage** and **Billing and limits** pages in **FME Settings** to access the following information:
* [Usage metrics](#view-usage-data) such as Monthly Tracked Keys (MTKs), impressions, and events
* [SDK usage](#view-sdk-usage-data), displaying which SDKs are actively sending traffic
* [Account-level billing information and service limits](#view-billing-and-service-limits)
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**UPCOMING CHANGE TO USER-BASED BILLING**
Harness FME is transitioning away from seat-based pricing. **User seats** will be replaced with active users, defined as any user who accesses an FME capability (including view-only usage).
Until this update rolls out, the **Billing and limits** page will continue to show registered seats.
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{% tab title="Usage" %}
Harness FME provides three primary usage metrics on the **Usage** tab, and usage data (MTKs, impressions, and events) updates daily.
#### Monthly Tracked Keys (MTKs)
Monthly Tracked Key (MTKs) are the number of unique [traffic type identifiers](/feature-management-experimentation/management-and-administration/traffic-types.md) (e.g. users) evaluated by an SDK in a calendar month.
* MTKs represent the number of unique keys evaluated for treatments.
* Keys are de-duplicated across projects, environments, traffic types, and feature flags.
* A key evaluated across multiple flags or traffic types counts once.
* MTKs do not represent impressions.
* MTKs typically approximate the number of unique end users interacting with your application.
#### Impressions
[Impressions](/feature-management-experimentation/use-fme/feature-management/monitoring-and-analysis/impressions.md) are unique event records generated each time an SDK evaluates a treatment for a tracked key.
#### Events
[Events](/feature-management-experimentation/use-fme/release-monitoring/events/index.md) capture user or system behavior.
For example:
* Page views
* Button clicks
* Transaction metadata
* Performance metrics such as response time
### View usage data
To access your usage data:
1. From the FME navigation menu, click **FME Settings**.
2. Under **Account Settings**, select **Usage**.
You can export each usage report as a CSV file by clicking the **Download CSV by environment and project** link under each chart.
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For additional usage data, contact [Harness Support](/feature-management-experimentation/troubleshooting-and-resources/fme-support.md).
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{% tab title="SDK Usage" %}
Harness FME displays which SDKs are actively sending traffic over the last seven days on the **SDKs** tab.
This data helps you monitor:
* Which SDKs are integrated in your application
* The environment each SDK is reporting from
* The version that is currently detected vs. the latest available version
If a newer version is available, update the SDK to ensure compatibility and access to the latest features.
### View SDK usage data
To access your SDK usage and versioning data:
1. From the FME navigation menu, click **FME Settings**.
2. Under **Account Settings**, select **Usage** and click on the **SDKs** tab.
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{% tab title="Billing and Service Limits" %}
On the **Billing and limits** page, you can view the following:
* Your current billing plan
* Plan expiration date
* Support plan
* Billing limits (for example, MTKs and user seats)
The **Service limits** section includes a table that displays your usage toward FME object-level limits and any feature-gated consumption thresholds. These limits help ensure platform reliability and prevent unexpected usage spikes.
### View billing and service limits
To access your billing and service limits data:
1. From the FME navigation menu, click **FME Settings**.
2. Under **Account Settings**, select **Billing and limits**.
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Service limits do not affect billing. Harness FME service limits require that you request limit increases manually by contacting [Harness Support](/feature-management-experimentation/troubleshooting-and-resources/fme-support.md).
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