Strike (strike.me) is a Venmo-like app that lets users connect their bank account and then hold a USD balance. The only difference is that users can use their USD to send Bitcoin to the other end. They’re not exposed to bitcoin’s price volatility.
On nostr, users are sending micro tips to other each other fairly successfully. The UX isn’t great right now, but I recommend trying it out- it is a functioning version of social micro payments.