Black Market & Underground Exchange

The Underground Exchange trades goods through the janitorial service. After it is unlocked, put the required goods in the trash bin and use the service; the exchange returns goods by morning. It is separate from ordinary Black Market customers buying and selling at your counter.

See Sawyer and the Black Market for the introduction and reputation rules. At −40 Black Market standing, the Blacklisted penalty bars you from the Exchange.

Regular recipes

Counts mean distinct matching item objects. “Two ammunition items” does not mean two loose rounds inside one ammunition item. Item condition is also checked; a matching name alone may not make damaged or otherwise invalid goods eligible.

Give	Possible return
3 × Water Filter	1 × Water Filter (replacement)
2 items tagged as Modules	A random module from the pool below, or Neural Core Module (Capped)
2 × Vial of “Dream Dust”	Random supplies from the regular Dream Dust pool below
1 × Disposable Keycard (Command)	One at random: Disposable Keycard (Security), Disposable Keycard (Medical), Disposable Keycard (Engineering)
2 items tagged as Poison	Energy cell; charge depends on the inputs
2 items tagged as Ammunition	Food or drink from the ammunition pool below
1 × Oxymore Injector + 1 × Smuggler’s Bay	1 × Smuggler’s Bay (Modified)

Promotional recipes

These seven recipes are registered as promotional. They only apply while offered, rather than all being active every night.

Give	Possible return
1 × Vial of “Dream Dust”	Medical rewards from the promotional Dream Dust pool below
1 × Disposable Keycard (Security)	Security Department Supply Crate
1 × Disposable Keycard (Medical)	Medical Bay Supply Crate
1 × Disposable Keycard (Engineering)	Engineering Foundry Supply Crate
1 item tagged as Seed	Energy cell with 100 charge
1 × Scavenger’s Token	+25 Black Market reputation
1 × Oxymore Injector	Genuine Immunivax Injector

Every recipe in this build has a one-acceptance-per-night limit. Bringing twice the inputs is not a promise of two uses of the same recipe. Overlapping recipes compete for physical items, so check the active list before leaving supplies for the cleaners.

Module reward pool

These are possibilities, not seven rewards for a single exchange. Generated module properties can vary.

• Eco Module
• Efficiency Module
• Neural Core Module (Capped)
• Overclock Module
• Performance Module
• Quality Module
• Refinement Module

Regular Dream Dust reward pool

The reward routine reads the input’s purity and uses random branches. These are all named item possibilities and prepared-item outputs in that routine; they are not one guaranteed bundle.

• Birth Control Pill
• Blood Bag
• Box of REX Condoms
• Electronic Parts (Common)
• Energy Cell
• Food Stamp
• Kitchen Knife
• Meat Cleaver
• Medical Supplies (Common)
• Metal Ingot
• Peat
• Raw Meat (Small)
• Scavenger's Token
• Self Charging Energy Cell
• Water Filter

Promotional Dream Dust reward pool

This is a separate, medical-focused recipe. Its Immunivax branches include both genuine and expired prepared variants. Inspect what you receive; do not assume every injector in this pool is fresh.

• Bag of "Blue Blood"
• Blood Bag
• Immunivax Injector
• Medical Supplies (Common)
• Oxymore Injector
• Synaprest Injector

Ammunition reward pool

• Cat Chocolate Bar
• Galaxy Blend
• Peat
• Pilk
• Soda

Crates are containers, not fixed bundles

A crate exchange gives the specified crate. Its contents are generated by a separate loot-crate factory, so the recipe is not a guarantee of a particular gun, drug or module inside. Keycard exchanges and opening a locked crate are different actions.

Sources: all fourteen ExchangeList factories registered by ExchangeManager.Init; acceptance callbacks and the static module pool; ExchangeBarter.CanAccept/GetRequiredItems, BarterCondition.IsItemValid and ExchangeManager. Demo build 049-Rev3-L. The SeedBarter callback passes 100 to EnergyCredit; BMRepBarter passes 25 to ModBMReputation.