it has happened to US coins in modern times/
The Coinage Act of 1965 debased the coinage of silver from the dimes and quarter dollars and diminished the silver content of the half dollar from 90% to 40% before it, too, lost all of its silver content about 5 years later. The US government...
I've had a workaround for years. that is why these sites are of no use to me. if they should be simpler to use then my current method I will consider them.
the real question is can they be used in Iran or China?
I assume this is a useful service at an institutional level. however I suspect for a retail trader with a short term horizon.there are too many hoops to jump through. what minimum position size position or dollar value position are we talking about.