You can check out above graph to see how the market cap of GoldCoin has changed over time. The market cap value depends on the value of GoldCoin on that particular day and number of GoldCoin in supply at that day.

How is GoldCoin Market Cap calculated?

The GoldCoin Market cap is calculated using a simple formula. You can find it below:

GoldCoin Market Capitalization in USD = Number of GLD in supply X Price of one GoldCoin in USD

Since the price of GoldCoin is highly volatile you can see the market cap going up and down a lot. Sometimes price and market cap are not linear to each other due to increase in the supply of coins in the market and stable or decrease in the price of the coin. So you can say that it's not simple to predict the market cap of GoldCoin or predict the price of GoldCoin.