This was initially demoed at FediCon 2025, but CrowdBucks is an open source, self-hostable fundraising system that allows people to financially support one another. You use your existing Fediverse account to hold a fundraiser, and can also donate to other people’s fundraisers as well. The form factor is kind of similar to Kickstarter or Patreon.
Ah. My mistake then.
They are ubiquitous here, even when paying by card it goes through klarna.