Two examples of a so-called Antimatter Spigot are known in Connected Space, one orbiting the star Hamarsus in the Symphonate, and the other found in the periphery of the League, a breakaway faction from the Symphonate. The known examples are highly similar and this article discusses both.
The spigot is thought to have been produced by the Builders of the wormhole network forming connected space, but there are some hints that they might have been built by a different, older civilization; there appear to be some technological differences between the spigots and other artifacts attributed to the Builders. The Great Religion teaches that they are indeed made by the same Builders as the wormholes, but disagreement on this point exists among clerics.
Theoretical understanding of the operation of the spigot is limited, but it appears that it operates as a wormhole that inverts the matter-antimatter relation, i.e. a hydrogen atom entering one end of the spigot emerges as an antiproton with a positron. The wormhole is small compared to the ones used for interstellar transport in spacecraft. As with other wormholes, though, it is surrounded by hyperstructures controlling an exotic matter physics package to maintain its stability. The outer gate structures of the spigot harvest mass from a large gas giant in the host star system. The spigot dispenses antimatter as anti-hydrogen slush.
The spigot will dispense antihydrogen slush upon request, to all comers. Although the self-maintaining structure obviously possesses considerable intelligence, it does not discuss its origin or policies, and identifies its purpose only as "to provide antimatter." On rare occasion, the Hamarsus antimatter spigot is known to have defended itself violently against perceived threats. For this reason, as well as the obvious strategic importance of it as a resource, the Hamarsus system and its counterpart in the League are off-limits to unofficial business.