IANAL but from what I've read anyone can refuse any kind of payment prior to the transaction happening, such as $100 bills or being cash only. (https://www.fede

IANAL but from what I've read anyone can refuse any kind of payment prior to the transaction happening, such as $100 bills or being cash only. (https://www.federalreserve.gov/faqs/currency_12772.htm https://www.federalreserve.gov/faqs/currency_12772.htm) I believe it's wide open, you could say only accept gold bars and feral chickens for instance.(https://money.stackexchange.com/questions/77001/can-i-accept-gold https://money.stackexchange.com/questions/77001/can-i-accept...) The argument is that me buying a sandwich for $10 could also be validly viewed as the sandwich shop buying a $10 bill from me with the currency of a sandwich. Thus the method of payment is as subject to variation as the product being exchanged. The robust utility of cash and why this isn't usually done is that I can have two $10 banknotes, one crisp and well preserved and the other ragged, dogeared and blemished but for the sake of the transaction they are both worth exactly $10 without any negotiation. That's a fairly unique property of money, it doesn't lose value with wear and tear or defects. Anyways, when it comes to accepted payments, vendors are given a lot of liberties