https://liberapay.com/ https://liberapay.com/ Liberapay sort of does it that way, though their payment processor has made it somewhat difficult. Basically you

https://liberapay.com/ https://liberapay.com/ Liberapay sort of does it that way, though their payment processor has made it somewhat difficult. Basically you pay them 50$ and then you decide how much you're going to sent to projects and how often. For example, I donate about 0.50ct each month to mastodon (sadly I do not have much expendable income at the moment). But it means I can spread little money into donations over an entire year. I think they still need to make a percentage-mode, where I allocate money from my pool on percentages (ie, 20% of the money to mastodon over a year, every month, results in 0.83$ every month being transferred, or 10$ over the year)