According to the statement released by the Bitfinex cryptoexchange, for many years the only dominant stablecoin option was USDT aka tether, and for quite some time the said exchange was the only way one could successfully cash in their USDT tokens, with withdrawal being charged by Bitfinex, but a 1:1 redemption offer, which, by the way, has been recently revoked, making Tether LLC to restore its own redemption initiative complete with a doubtfully high fee schedule.
Apart from USDT, USDC, and PAX, the dollar-pegged tokens which are seemingly being integrated everywhere, both Bitfinex and Ethfinex also offer Dai, an Ethereum-based stablecoin, as well as TUSD and GUSD. The inclusion of the latter is worth noting, due to the fact that Bitfinex is one of the first dominant cryptoexchanges apart from Gemini to include its usage, which, in turn, helped the rise of the adoption rate for the stablecoin presented by the Winklevoss brothers. It also has to be mentioned that Bitfinex now also offers EURT, which is the EUR version of Tether.
Whereas previously utilizing tether tokens meant that you were guaranteed a 1:1 USD ration at Bitfinex, currently they will have varying, although rather little, rates in accordance with the supply and demand. Apparently tiny arbitrage chances will therefore be set up over the stablecoins and currencies. Now and then, users will become enabled to purchase one of the included dollar-pegged tokens for less than 1 USD it costs from its issuer, and then sell it back for a slightly bigger amount at a later date. Such tactics is not very profitable for those who own small portfolios, but big and institutional financiers will acknowledge the offered potential, and the implementation of this initiative in itself will probably boost the renewal of volume at both platforms of Bitfinex and Ethfinex.