There is no federal statute mandating that a private business, a person, or an organization must accept currency or coins as payment for goods or services.
When you want to buy something, that isn’t a debt. It’s only a debt if you already own the thing and haven’t paid for it yet, so the law about accepting dollars in payment for debt doesn’t apply.
Only for debts owed. That’s how stores can say they only accept credit card. If you’re just buying something, a store can refuse US currency.
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The federal reserve disagrees with you. https://www.federalreserve.gov/faqs/currency_12772.htm
When you want to buy something, that isn’t a debt. It’s only a debt if you already own the thing and haven’t paid for it yet, so the law about accepting dollars in payment for debt doesn’t apply.