> For the complete documentation index, see [llms.txt](https://fingerate.gitbook.io/fingerate-whitepaper-v3.1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fingerate.gitbook.io/fingerate-whitepaper-v3.1/4.-tokenomy-and-ecosystem/4.2-tokens-and-mileage-unit/4.2.2-som-sot-mileage-app-mileage.md).

# 4.2.2 SoM (SoT Mileage) App Mileage

SoM is a unique in-app currency designed to both reward users and facilitate survey creation within the platform. With SoM, users can purchase various digital items for their avatar like clothing and footwear, as well as redeem coupons, gift cards, and even exchange cryptocurrencies, including MSOT tokens.