The Reciprocity Agreement was a treaty between the Republic of Cinnabar and the neutral Commonwealth of Kostroma.

It granted Cinnabar the right to land warships on Kostroma instead of staying ten light-minutes out like those of other nations.

As a matter of unofficial policy that was part of the agreement, neutral Kostroman vessels carried cargoes to Cinnabar but not to worlds of the Alliance. (RCN1)