In a Lil sci-fi universe I'm currently writing
Humanity has reached the stars, quickly establishing an impromptu interstellar colonial empire made up of hundreds of star systems, puttering along the Milky Way on their ships on the backs of nuclear fission and fusion and traveling faster than light via warp drives that convert matter into energy and information and slip it through the space between universes to where they need to be, with a book 4-9 Expanse-style civilization and ship aesthetic, a vast internal interstellar economy regulated by a republic based on Earth, for Earth. basically, Humans are transiting from a type 0 to a type 1 civilization.
They're one of the last know sentient races to do so, the Milky Way is populated by dozens of other, more advanced races that have arisen and have done the same thing, only earlier.
One of these is a race of Corvid-like humanoids from a world of lesser gravity and a thick atmosphere made of the same stuff Earth's atmosphere is but with more O2, they've advanced to the point of anti-gravity and full-on antimatter-based tech (reactors, propulsion, etc.) with a parliamentary monarchy government and were one of the first races Humanity met on their expansion into the Milky Way.
But the question is,
What does mankind have to offer that these other races don't have or do need?
- Can't have to do with something like slave labor
- Humans are trading for advanced technology or exotic resources
- Safe to assume that these races have similar access to the same resources humans do
- Human economy is mostly based on interstellar colonies sending materials back to Sol (our solar system) in exchange for needed supplies and funding
- Other races are willing to trade for information, territory, passage through human space, or lifeforms