Sweatcoin is an iPhone and Android app which pays you in tokens to walk. These tokens can be exchanged for prizes which vary over time.
See my review for a more detailed description of the software.
Previously Sweatcoin only counted outdoor steps as their algorithm relied on using GPS for step verification. However, this is no longer the case as within the last month they have started accepting indoor steps.
Their official FAQ page is available here for some additional details.
To acklowledge the decrease in activity for most people due to the current Covid-19 pandemic the Sweatcoin team have decreased the number of steps required to obtain bonus coins through watching ads.
Spare Time Income 