The market cap is the current USD price times total supply at 1 billion coins that will exist when all periods are over. EOS is just about $2.7 billion now. I thought $888 million valuation in end of first period was a cheap as it gets so I loaded then. Who knows maybe it falls back down past the first 5 day price but I doubt it. Too many people thought they would be clever by waiting for later to buy but the space is moving so fast, its probably only going to get more expensive.