I'd recommend pb <https://github.com/ptpb/pb>. It is free and open-source (so you can easily host your own deployment of it—it's even in the AUR for Arch users: <https://aur.archlinux.org/packages/pb-git/>), provides a ton of features that no other pastebin offers and provides most (if not all) of the features provided by other common cli-accessible pastebins (like ix and sprunge). You can find the reference deployment at <https://ptpb.pw>.