Kickstarter's got one, but it's invite-only right now. https://d.rip - I could find no sign of their fee structure anywhere on the site.
There's also https://liberapay.com - a non-profit Patreon clone, whose code is public. You may have to be creating open source content, I'm not sure. Seems to pay weekly, does not take any cut themselves (?!?!?).