I'm not sure if what I'm looking for exists, or if it's even possible to build.

I would like to have a central place where I can donate some monthly amount. I set up my profile and say, from my monthly donation, I want x percent to go to this project, y percent to that project, and so on. So instead of setting up some number of donations for all the projects I use and want to support, I have a single donation to support multiple projects.

Is there already a platform like this?