There's a minimum to the amount you can exchange per transaction, making it difficult to shift small amounts of currencies, but otherwise you're free to swap as you see fit. (investinblockchain.com)
Once you find one, you can also craft it by spending current items and a certain amount of currency. (softpedia.com)
Unlike other survey companies, even if you fail the initial screening, they will still give a token amount of currency for your effort. (austravelpoints.com)