The premium currency — earned in-game or deposited, spent on instant actions and the market.
Space Energy (SE) is the premium currency. You can earn it through gameplay — missions, achievements, and onboarding rewards — or add it by depositing. SE is held in two pools: an Earned pool (from gameplay) and a Withdrawable pool (from deposits). When you spend, your Earned SE is always used first, protecting your deposited balance.
SE pays for instant-finish on building upgrades and ship training, permanent extra builder slots, market commissions, and store purchases such as shields, stamina refills, and resource packs. See the Economy section for exchange rates, fees, and deposit/withdrawal rules.