You can see the currency Rates from Magento Admin
System -> Manage Currency Rates
You can change base currency and allowed currencies from
System -> Configuration -> GENERAL -> Currency Setup -> Currency Options
Now, here I will show you how you can get currency rates values for any given currency code.
Here, I will be fetching currency rates for base currency. You can keep any currency code instead of basecurrency.
/**
* Get the base currency
*/
$baseCurrencyCode = Mage::app()->getBaseCurrencyCode();
/**
* Get all allowed currencies
* returns array of allowed currency codes
*/
$allowedCurrencies = Mage::getModel('directory/currency')
->getConfigAllowCurrencies();
/**
* Get the currency rates
* returns array with key as currency code and value as currency rate
*/
$currencyRates = Mage::getModel('directory/currency')
->getCurrencyRates($baseCurrencyCode, array_values($allowedCurrencies));
Similarly, you can get currency rates for any currency code. But remember that the currency should be set as allowed currency in
System -> Configuration -> GENERAL -> Currency Setup -> Currency Options -> Allowed Currencies
$allowedCurrencies = Mage::getModel('directory/currency')
->getConfigAllowCurrencies();
/**
* Get currency rates for Nepalese Currency
*/
$currencyRates = Mage::getModel('directory/currency')
->getCurrencyRates('NPR', array_values($allowedCurrencies));
Hope this helps. Thanks.