The AUR is down, so there's nothing wrong with Yay, Paru or any other AUR helper

[Bryanpwo]

The AUR is down at the moment. This will cause error messages when you want to update your system with any AUR helper.
We just have to wait until the service is available again.

You can also discuss this topic further here:

AUR is down

I got this message this morning when trying to update: $ yay :: Synchronizing package databases... endeavouros is up to date core is up to date extra is up to date multilib is up to date :: Searching AUR for updates... :: Searching databases for updates... -> 1 error occurred: * response decoding failed: invalid character '<' looking for beginning of value When checking for issues with yay, I checked the main AUR page from the Arch WiKi and it’s not responding.

EDIT: It seems to be solved, the AUR was steadily available for the past hours.