With that said, I sold 6 eagles today for $363 a piece; totalpayout: $2178.00
This just means that states can't print their own currency. I suppose a state could pass a law allowing debts owed to the state to be paid in gold or silver, but I doubt any state does that.
So Federal rules are going to prevail. You could pay in $20 gold pieces, which are still legal tender, but you'd be crazy to do so.
However gold can be used in payment if both parties agree to it. By the way, that would have been very illegal 1933 - 1975.
Under the constitution, nothing but gold and silver are legal tender. In other words, only gold and silver are money. The government is charged with "coining money," which means that it can take gold and silver, make it into coins, regulate the weight of the coins and affix value to those coins.
The current Federal Reserrve "Notes," are blatantly unconstitutional. (Please don't cite case law in opposition -- unless you think the Supreme Court's affirmative action ruling makes that abomination constitutional as well.)
The consitution says what it says about money. Why would the Founders have bothered to place that gold and silver language in the constitution and define the feds' money coining power -- except to ensure that the federal government would never have the power to foist worthless paper with no intrisic value on the people?
The fact that our extra-legal monetary system is now so entrenched that no court will ever uphold the gold and silver clause does not change the fact that a constitutional amendment would be necessary to make federal reserve notes actual legal tender.