code: public static boolean isConversionAvailable(String currencyCode, String... providers){
          return getMonetaryConversionsSpi()
                  .isConversionAvailable(Monetary.getCurrency(currencyCode), providers);
      }
docs: Checks if a {@link javax.money.convert.CurrencyConversion} is available for the given parameters.
  
  @param currencyCode The currency code, resolvable by {@link javax.money.Monetary#getCurrency
  (String, String...)}
  @param providers    Additional providers, for building a provider chain
  @return true, if a conversion is accessible from {@link #getConversion(String, String...)}.