Calling the Gadi Hills a city-state is a bit of a misnomer. The Gadi Hills is a number of tribal herder-gatherer nomadic groups. They have a nominal ‘ruler’ the Kohr who is ‘elected’ by the elders of the various tribes in their once-a-decade Kohrus meeting, at some hidden location deep in the hills.
The Gadi Hills consists mainly of ‘humanoids,’ but 2 of the strongest tribes are nearly entirely Half-orc, and that is how many view the Hills. Many of the races considered monstrous or barbarous by other races live- if not in peace, at least in balance- in the Gadi Hills. The tribes make ‘war’ on themselves and other city-states seemingly at whim.
The Gadi is not a major trade stop, and such not a import/export partner for the rest of the city-states, generally. However, the tribes buy food stuffs and artisan crafts as they can; usually paying in animal products, mounts, and rare herbs. The only thing the Hills can be thought to export is mercenaries- it produces fine scouts, irregulars and light calvary.