I had this idea / pet project once where I did exactly this for email. Emails would immediately bounce with payment link and explanation. If you paid you get credit on a ledger per email address. Only then the mail goes through.
You can also integrate it in clients by adding payment/reward claim headers.
I had this idea / pet project once where I did exactly this for email. Emails would immediately bounce with payment link and explanation. If you paid you get credit on a ledger per email address. Only then the mail goes through.
You can also integrate it in clients by adding payment/reward claim headers.