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

# engageAudienceUniqueCount

> Estimate the unique audience size for a given combination of segments,
customer tags, and/or explicit customer ids — without creating a campaign.

Use before [`engageMessageAdd`](/api-reference/mutations/engageMessageAdd) to preview reach.

<small>

*Auth* · `x-app-token` · authenticated

*Related:* [`engageMessageAdd`](/api-reference/mutations/engageMessageAdd)

</small>



## Related topics

- [engageMessageStart](/api-reference/mutations/engageMessageStart.md)
- [engageMessageAdd](/api-reference/mutations/engageMessageAdd.md)
- [EngageAudienceTag](/api-reference/types/EngageAudienceTag.md)
- [engageMessageCounts](/api-reference/queries/engageMessageCounts.md)
- [EngageSegment](/api-reference/types/EngageSegment.md)