> ## Documentation Index
> Fetch the complete documentation index at: https://plain-docs-orca-916-agent-docs-restructure.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# previewBillingPlanChange

> Returns a cost preview for switching to a different billing plan, including the immediate charge and the earliest date the change can take effect. No changes are made to the subscription.