There is no doubt that one of the main characteristics of cryptocurrencies is their volatility. Depending on how you look at it, it can be a positive thing if you know how to "play" or something negative if you take the surprise that the currency in which you invested has gone down in price.
In this case Theter is a cryptocurrency that always has the same price, the value equal to 1 USD. It is likely that if you look right now, the price is not exactly one dollar, but it is always around that value. Also, the founders say that each Theter in circulation is backed by a dollar in the company's accounts.
This cryptocurrency is not minable. In this way they ensure that its value does not fluctuate so it is perfect for traders who want to enter the world of Blockchain but do not want to take the risk with fluctuations.
If you want to know which Wallet use to store your USTD we recommend you take a look at this article where we are talking about the most recognized Wallets of this cryptocurrency.
To track any Wallet or transaction made with USTD you just have to access this website, it is an explorer that gives you the available information of the transactions.