Sell and buy items/fluids/energy on the black market using trading chests/tanks/accumulators, choosing the frequency of exchanges and related fees. You can now sell your overproduction and buy things that you don't want to craft by yourself. You can also use these trading units as a paying shipment system. All mod parameters and prices are fully configurable and the major modpacks are working as of Factorio 1.0.0.
Major feature improvements and full mod write-up coming soon!