The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much a 500-dollar Amazon gift card is worth in naira today, one needs to check the current exchange rate.

Exchange rates are influenced by various factors such as economic conditions, monetary policies, and market forces. Financial institutions and currency exchange platforms provide the most accurate and up-to-date rates. By looking up the prevailing rate, one can calculate the equivalent amount in naira.
For example, if the exchange rate is 1 dollar = x naira, then a 500-dollar Amazon gift card would be worth 500 * x naira. It's essential to stay informed about the currency market to get the best conversion value when dealing with such transactions.