The rate of a 100-dollar Xbox gift card can vary depending on several factors. One of the main determinants is the market demand. When there is a high demand for Xbox games and services, the value of the gift card might be closer to its face value.

However, in some cases, due to fluctuations in the gaming market or secondary market dynamics, the rate could be different. For example, if there are special promotions or a large number of gift cards being sold in the market, it might influence the rate. Some people might be looking to sell their gift cards quickly, which could lead to a slightly lower rate than the standard 100 dollars.
To accurately determine the current rate of a 100-dollar Xbox gift card, it's advisable to check various online platforms where such gift cards are traded. These platforms can provide insights into the going rate based on recent transactions. Additionally, comparing prices across different sellers can give a better understanding of the prevailing rate in the market at a given time.