The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much a $15 Amazon 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, market forces, and central bank policies. These fluctuations can cause the value of the conversion to vary significantly from one day to another.
To find the exact amount, it is advisable to refer to reliable financial news sources, currency exchange platforms, or banks. They can provide the most accurate and up-to-date exchange rate, allowing for a precise calculation of how much the $15 Amazon card would be equivalent to in naira at present.