You can do this with a centralized service that offers redeemable bearer tokens for arbitrary amounts that transfers a predefined amount from requester’s account to the redeemer’s account.
The problem is that AML and KYC regulations around payments mean that only heavily regulated and licensed entities can process payments, and this is why the MC/Visa gross margins on processing transactions is like a billion percent or something (and why they have per-tx fee minimums which basically nuke the possibility of micropayments).
Regardless of intent, the government is protecting their revenue streams. It’s illegal to build a frictionless and anonymous microtransactions system.
They say it’s for AML purposes but I think the real reason the state wants 100% ID-based surveillance on all payments is because if you could make secret payments that they can’t observe, censor, and interdict, then you could raise and pay your own army, which is the main thing keeping the state the state - no other armies are allowed. Their monopoly on violence is anticompetitive. :)