The chance of winning the biggest prize (The $15,000 Rolex) is 1 in 2 billions.
The chance of winning the $1500 iphone is 11 in 1 billion.
The chance of winning the $500 Amazon gift card is 3 in 100 million.
You can calculate the winning chance of each of other prizes using the following table easily.
https://i.imgur.com/WExkPe3.jpgWe had this discussion before and came to the conclusion that the odds of winning the Rolex are really 1 in 4.294967295 billion. For the other prizes it is just as easy as looking at the prize table.
After reading this post I decided to read through the details of how the spins are calculated. It says that the decimal is rounded down to the the nearest whole number. That would make the odds for winning the Rolex 1 in 4294967295 since there is nothing that can be rounded down to 1 billion and only the maximum 8 digit hexadecimal number is able to get a result of exactly 1 billion.
