The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much 20 dollars in Amazon card is worth in naira today, one needs to check the current exchange rate. This rate can be obtained from financial news sources, online currency exchange platforms, or even some banks.

When converting, it's important to note that different platforms may offer slightly different rates. Some might have a margin for profit, which could affect the final amount in naira received. For example, if the exchange rate is around 410 naira per dollar, then 20 dollars would be approximately 8200 naira. However, this is just an estimate based on a given rate.

To get the most accurate conversion, it's advisable to look at multiple sources and compare the rates. Additionally, economic factors such as inflation, interest rates, and global market trends can also impact the exchange rate. So, the value of 20 dollars in Amazon card to naira today can vary depending on these circumstances.