Gulden Trader Exchange is closed down exchange this is evident from the announcement that can be seen in the homepage when you open the website:
"Guldentrader has seized its operation
Please withdraw all funds before the 1st of april 2020."
Well, this whole announcement actually sums up everything about the exchange. Gulden Trader Exchange doesn't have any information about its concerning its ICO, market cap nor its trading volume. Inability to trade on this exchange means i can't provide a full time personal experience. There is no means of contacting the customer support, i searched all through but the link that i found led me to the customer support but I wasn't able to get any form of response.