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

How is Halcyon Market Cap calculated?

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

Halcyon Market Capitalization in USD = Number of HAL in supply X Price of one Halcyon in USD

Since the price of Halcyon 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 Halcyon or predict the price of Halcyon.