Activitypub micropayments idea:
what if instead of some digital token like Taler or Monero, I send a digital “cheque” instead, which is a signed payment intent, signed with the other actor’s e.g. Liberapay pubkey.
At the end of the month, the other person can take all these micropayment cheques and prove to liberapay that other people owe them money, and everything is settled in one transaction.