alt Hacker News> IN the continental US, you cannot refuse to accept a dollar note.
Minor side note: this is true only for repayment of debts. Some local jurisdictions require private parties to accept cash for new purchases, but there's no federal requirement to do so.
If I purchased a stick of 32GB DDR4 RAM from you for $100, am I now not in $100 debt to you? We are private parties - can you refuse to accept a legal $100 and force me into paying you by Zelle?