> For the complete documentation index, see [llms.txt](https://xtop-pet.gitbook.io/xtoppet-whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xtop-pet.gitbook.io/xtoppet-whitepaper/pet-system/pet-upgrading/manual-upgrade-payment.md).

# Manual Upgrade Payment

If players wish to upgrade their pets faster, they can opt for a manual upgrade. The cost for manual upgrading is calculated based on the required food energy's XTO value. Upon payment of the appropriate XTO, pets are immediately upgraded to the next level.

* **Cost Calculation:** The total required food energy is directly converted into the XTO expense. For example, upgrading from level 2 to level 3 would cost 75 XTO if each energy point is valued at 0.1 XTO.