Helloes!
This staking feature is on Hive-Engine!
It is still very basic but will be improved with automation and delegation features over time.
Currently I am working on frontend features for Styx that will bring Hive elements to the website proper. What's more is that we will be able to have several blockchains in parallel, so you may discover sites that have elements of Styx, Polygon and Hive (for example)!
We are also working on dedicated staking features on Styx. At the moment it's more a scientific interest than an economic one though. You can see an early example here: https://styx.nyx-labs.com/stakes/mumbai/
Styx also has the "Spirit Stakes" modules which function as game elements and prototypes. The plan is that they too will influence your Hive, Eth, MATIC, Styx, etc. experience ^^