Retrieve a list of currently supported currencies by the currency API
https://api.upcdatabase.org/currency/history?base=XXX&date=YYYY-MM-DD
The response contains an array of all the currently supported currencies in JSON format.
{ "success": true, "date": "2010-12-15", "timestamp": 1585177234, "base": "USD", "rates": { "AUD": 1.01, "CAD": 1.005, "CHF": 0.963, "EUR": 0.754, "GBP": 0.641, "JPY": 84.026, "NZD": 1.345, "SEK": 6.811, "USD": 1 } }