Check the source on the donation page. It looks like they actually use something called Gr4vy above all that to handle payments. https://gr4vy.com https://gr4v

Check the source on the donation page. It looks like they actually use something called Gr4vy above all that to handle payments. https://gr4vy.com https://gr4vy.com Using a platform with its own fee on top of payment processor fees would explain the 6.4%.