I don’t think anyone is paying the alt-right foot soldiers, but there is a lot of money out there.
Largest is the Heritage Foundation, which took a swing to the far right years ago:
Koch Bros’
https://umbraxenu.no-ip.biz/mediawiki/index.php/Category:Cato_Institute
I don’t know where Judicial Watch really stands:
https://umbraxenu.no-ip.biz/mediawiki/index.php/Category:Judicial_Watch
Gatestone Institute & friends:
https://umbraxenu.no-ip.biz/mediawiki/index.php/Category:Gatestone_Institute
Backing a lot of the Islamophobia:
https://umbraxenu.no-ip.biz/mediawiki/index.php/Category:Jihad_Watch
https://umbraxenu.no-ip.biz/mediawiki/index.php/Category:David_Horowitz_Freedom_Center
And then there’s Robert Mercer’s clump of organizations.
The listed assets don’t always tell the story, some are money funnels.