The conversion rate between the US dollar and the Nigerian naira fluctuates constantly. To determine how much 300 dollars in 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, market trends, and central bank policies. Financial institutions and currency exchange platforms provide the most up-to-date rates. By looking up the latest rate, you can calculate the exact amount in naira.

It's important to note that the value can change throughout the day. So, when considering the conversion of a 300-dollar Amazon gift card to naira, it's advisable to get the most recent exchange rate to ensure an accurate determination of its worth in the Nigerian currency.