@rebbeccaryan mam.....
One of the site’s major strengths is the depth of the variety of its listings. Bittrex currently lists hundreds of coins and also offers users hundreds of cryptocurrency trading pairs, with the site showing over 450 BTC pairs. Bittrex offers good options for trading via Bitcoin and Ethereum, however, it does not currently offer fiat trading pairs (trading via USD, EUR, GBP). Users can though purchase Bitcoin, Ethereum, or USDT via bank wire transfer. For this to take place an “enhanced verified” account is necessary along with a purchase amount worth a minimum of $10,000.
Additionally the site does provide 11 USDT trading pairs.

USDT is a cryptocurrency asset issued on the Bitcoin blockchain and each USDT unit is backed by a U.S Dollar held in the reserves of the Tether Limited. USDT is linked or “tethered” to the price of the US Dollar and acts as a stable digital currency that gives traders additional options. USDT as a “tether” and can be transferred, spent, and stored in the same way as other cryptocurrencies. In order to trade USDT for fiat currency users can purchase and redeem tethers directly on the Tether Platform.
Cheers~~~