Could work with zaps. Back in the old days before zaps, it would start with an invoice for a small amount. Someone would pay it, then post a note confirming payment with an invoice for double the amount. Someone else would pay that and post invoice for double and so on. As you can probably tell, someone ends up being the yield at the end when the invoice amount gets so high no one wants to pay it. Hence “hot-sat-potato” 😂