Currency Converter works with different bank webservices to fetch rates. It also may use GoogleFinance API to get rates.
'com.tunyk.currencyconverter:currency-converter-api:1.0'
<dependency>
<groupId>com.tunyk.currencyconverter</groupId>
<artifactId>currency-converter-api</artifactId>
<version>1.0</version>
</dependency>
<dependency org="com.tunyk.currencyconverter" name="currency-converter-api" rev="1.0"/>
"com.tunyk.currencyconverter", "currency-converter-api", "1.0"