The trading post is a building found at 20 km of depth, traders comes in for one hour every three hours, this time could be accelerated with chests and scientists' excavations, or skipped with a ticket. You can also upgrade Trading Post in Craft Center to decrease the time between every new trade.
The traders come with deals that are often, but not always rentable, evolving with the in-game progression.
|level||earth post||time per(hours)||moon post||time per(hours)|
|1||4 hours||4 hours|
|2||3 hours 30 mins||3 hours 30 mins|
|3||3 hours||3 hours|
|4||2 hours 30 mins||2 hours 30 mins|
|5||2 hours||400 Bm