I’m not sure what you mean by that.
You can configure pacman-mirrors
to only use HTTPS servers if you wish. See man pacman-mirrors
:
-P, --proto, --protocols PROTO [PROTO] ...
Write protocols to configuration, using all or http, https, ftp and ftps.
That’s up to you to configure on your own system.
See Security - ArchWiki for more details about hardening your system.