> For the complete documentation index, see [llms.txt](https://docs.usesparx.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.usesparx.com/sparx-documentation/product-overview/cloud/underutilization-insurance.md).

# Underutilization Insurance

Sparx's underutilization insurance model ensures that any underutilized Reserved Instances purchased on your behalf by Sparx are automatically transferred and sold out of your account and the difference is refunded in the form of a credit on the following month’s bill.

For example, Sparx recommends a t2.xlarge instance in `us-east-1` (N Virginia). After running for 300 hours, the instance becomes underutilized. When this happens, Sparx will automatically transfer the instance to another company in our customer pool or list it on the EC2 Reserved Instance marketplace so that it is sold to another company. Sparx is constantly scanning the marketplace for the most liquid instance types and will re-size and re-list your instance accordingly. The cost of the window from when the instance became underutilized would then be credited to you out of the next month's bill. 

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Note: Any over-provisioning that occurs as a result of user action is not covered by this guarantee.
{% endhint %}