Our API is online since 2016 via Currency API at RapidAPI
Currency API

Convert money from one currency to another.
Supported currencies:

"AUD", "BGN", "BRL", "CAD", "CHF", "CNY", "CZK", "DKK", "GBP", "HKD",
"HRK", "HUF", "IDR", "ILS", "INR", "ISK", "JPY", "KRW", "MXN", "MYR",
"NOK", "NZD", "PHP", "PLN", "RON", "RUB", "SEK", "SGD", "THB", "TRY",
"USD", "ZAR"