Is there an online tool that shows true currency exchange rates? \ stacker news ~econ

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Using relative BTC prices, instead of “official” rates?

I sometimes use trading view to view the price/rate. It's usually up-to-date. Did I answer your question?

Does it show the “black market” unofficial exchange rate fiat/fiat? Like USD/ARS blue dollar rate instead of govt exchange rate?

what is ARS?

Blue dollar? can you explain?
What is the name of the bond or ticker