Quick answer
Sawyer opens the exchange on Day 25. Leave the input items in your store trash can before you sleep, keep the Janitorial Service active, and collect the reward the next morning. Each trade works once a night, and it also raises your Black Market reputation.
On this page
How to unlock it
Sawyer arrives on Day 25 and leaves the Underground Exchange Directive on the ledge. The Sawyer's Crew perk unlocks it from Day 1, and the Fence start has it straight away.
How a trade works
- Put the input items in your store's trash can before you sleep.
- Keep the Janitorial Service active. Without it, no trade happens.
- Collect the reward from the trash can the next morning.
You can run several different trades in one night if the can holds everything, but each trade only works once a night.
Why your trade failed
Check that Janitorial was on and that the can wasn't full. A full can forfeits the reward, and anything not used in a trade is thrown out as garbage. At -40 Black Market reputation you're blacklisted from the exchange.
Permanent trades
| Put in | Get back | Notes |
|---|---|---|
| 3 Water Filters (any condition) | 1 new Water Filter | Good for used filters |
| Any 2 modules | 1 random module | Never the same type as the input |
| 2 Vials of Dream Dust | Random legal goods | Higher purity gives more |
| 1 Disposable Keycard (Command) | 2 random keycards | Security, Engineering or Medical |
| 2 Poison | 1 Energy Cell | Charge depends on the poisons' value, up to 100 |
| 2 Ammunition | At least 2 food items | Contraband ammo gives more food |
| Smuggler's Bay + 8 Oxymore Injectors | Smuggler's Bay (Modified) | Value rises from 250 to 400 |
The module trade usually gives Performance, Efficiency or Quality modules. Overclock, Eco and Refinement are less common, and the Neural Core Module is extremely rare.
One player tried the Smuggler's Bay trade and got an empty bay back the next day, so check the bay really was modified before you repeat it.
Weekly promotional trades
Three of seven promotional trades are picked each week, and the selection resets on Monday. Your Monday Nightly Report announces the change.
| Put in | Get back |
|---|---|
| 4 Vials of Dream Dust | Medical goods, better at higher purity |
| 4 Disposable Keycards (Medical) | Medical Bay Supply Crate |
| 4 Disposable Keycards (Engineering) | Engineering Foundry Supply Crate |
| 3 Disposable Keycards (Security) | Security Department Supply Crate |
| Any 5 Seeds | A fully charged Energy Cell |
| 1 Scavenger's Token | Black Market reputation |
| 2 Oxymore Injectors | A Genuine Immunivax Injector |
Dream Dust at 99% purity or better returns Synaprest Injectors and Bags of "Blue Blood". Low purity returns only two bandages.
Sources
- Every Underground Exchange trade — AllThings.How, 2026-10
- Discussion: Smuggler’s Bay upgrade came back empty — Steam Community, 2026-10-31
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