code: public boolean isAvailable(CurrencyUnit base, CurrencyUnit term){
          return isAvailable(ConversionQueryBuilder.of().setBaseCurrency(base).setTermCurrency(term).build());
      }
docs: Checks if an {@link javax.money.convert.ExchangeRate} between two {@link javax.money.CurrencyUnit} is
  available from this provider. This method should check, if a given rate
  is <i>currently</i> defined.
  
  @param base the base {@link javax.money.CurrencyUnit}
  @param term the term {@link javax.money.CurrencyUnit}
  @return {@code true}, if such an {@link javax.money.convert.ExchangeRate} is currently
  defined.