Gulden Trader Exchange is a centralized exchange which sprang from Netherlands, it is one if the few exchanges that have come from that region. I wasn't able to trade on this exchange as it is practically impossible. When i opened the website through the link provided by Revain, but i was actually surprised about what i saw, the exchange has stopped functioning. Gulden Trader Exchange had clearly stated that they had seized operations and were advising users to withdraw their funds. As of now there is no clear indication whether the exchange has or even had a mobile trading app before it closed down.