Bittrex, a U.S.-based cryptocurrency exchange, has issued a trading pair between tether (USDT) and TrueUSD (TUSD), two stable tokens pegged to the U.S. dollar. While tether is issued by Tether, TrueUSD is issued by TrustToken.
Unlike other cryptocurrencies, stable tokens are pegged to the value of traditional money. In this case, tether and TrueUSD are both pegged to the U.S. dollar, so that one token is worth one dollar.