This is an instance of skinprox, a caching skin resolver proxy for DDNet and other Teeworlds (0.6) mods.
You can find out more about skinprox on its homepage here: https://codeberg.org/Scrumplex/skinprox

If you want to use this as your skin provider in game, run the following command in the console:

    cl_skin_download_url "https://skins.scrumplex.net/skin/"


This instance queries the following sources (in the specified order):

https://scrumplex.rocks/skin/
https://skins.ddnet.org/skin/community/
https://skins.tee.world/
https://assets.ddstats.org/skins/