It can be offered as it is recognized as legal tender. It doesn’t have to be accepted.
https://www.federalreserve.gov/faqs/currency_12772.htm
Thanks. I wonder what that means as a purchaser and goods or services are owed for, if the buyer says, “My policy is to pay in currency only, and I am offering in that lawful and court-acceptable form, so take it or leave it.”