# Currencies | Big Mech Energy Idle Wiki

- **Scrap**, primary soft currency from kills. Levels your Chassis and the drone bay.
- **Components**, upgrade Parts and the Mech Core. Also the drone bay's main yield.
- **Cores**, prestige currency from Ascension; buys permanent Core upgrades.
- **Alloy**, melted spare parts (the Smelter); buys permanent capacity upgrades.
- **Parts**, the loot that builds your MechMaxxing. The infinite sink.