Gulden is a lesser-known virtual currency that has nonetheless enjoyed a bigger audience than was once the case. This means it has also risen in value, as might be expected. Watch for the exchange rate on Gulden before you buy or sell any, just as you would with any other currency. It is popping up as an option at some online vendors as an accepted form of payment. Online casinos tend to like adding cryptocurrencies to their banking methods, so you may find Gulden included as one of the available methods there.