The Xepolites were a neutral, spacefaring race.
In the 24th century, Xepolites often worked as intermediaries for the Cardassians, and many of the arrangements they were involved in were illegal. This included the smuggling of weapons to Cardassian colonists in the Demilitarized Zone. Unlike the Lissepians however, they had never been discovered until 2370, when Commander Sisko and Gul Dukat encountered a Xepolite Free Trader, commanded by Hetman Drofo Awa. (DS9: "The Maquis, Part II")
According to Star Trek: Star Charts (p. 47) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), there was a star system named Xepolite, which might possibly be the system of origin for this species, in the Alpha Quadrant. The system's primary was an A-class star. In the late 24th century, this was an independent system.