Trade depots send out trade ships to do their work. However, it is better to spread your ports out, so you expand the length of your longest trade route and boost your income more. For example, if you have a continuous trade route 4 jumps long, you would earn 1.3 credits per second at each of your ports. 0.075 credits per second are added to the income for each of your trade ports for each jump in the longest trade route you have. The base income rate for a trade port is 1 credit per second.

The Transcendia Starbases can be upgraded to function as a Trade Port as well. Trade Ports can be built faster depending on how many constructors you have in your gravity well through the Communal Labor ability. The Trade Port additionally functions as a refinery for the Advent through Resource Focus. The Advent are the only race that cannot directly upgrade their base trade income. Multiple trade ports can be built on a planet that will also increase the income from that particular planet's trade. You can optimize trade growth by creating trade routes. Trade ports give your empire a constant flow of credits, the galaxy's standard currency. Trade Ports allow your civilization to conduct trade between the various planets in the system, which earns the player credits.

Sins of a solar empire advent