> For the complete documentation index, see [llms.txt](https://docs.capnco.gg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.capnco.gg/game-guide/how-to-play/4.-currencies.md).
# 4. Currencies
## Premium Currency
**Nuggies** are the premium in-game currency. They are non-tradeable and can only be purchased, never earned through play. Nuggies are used to make [Auction House](/game-guide/how-to-play/7.-auction-house.md) purchases, pay crafting fees, and place Bounties.
## Progression Currency
**Doubloons** are the soft in-game progression currency. They are earned through play and are non-tradeable. You collect them by completing objectives in Pillage Wars, such as capturing towers, and they are the main reward dropped by loot chests, fishing, and bosses. Doubloons are used for crafting, rankings, and to mint [ecosystem currencies](#ecosystem-currencies).
## Ecosystem Currencies
Captain & Company connects to several blockchain ecosystems, and each one has its own ecosystem currency:
* **mXP** on Abstract
* **mScore** on Soneium
* **mXP** on Enjin
The Abstract and Soneium promotions are currently live.
For every Doubloon you earn in game, you earn the right to mint the same amount of ecosystem currency to its chain. Minting is only available to players with an active [Pirate Pass](/game-guide/how-to-play/11.-pirate-pass.md), and is handled from your profile at [capnco.gg/profile](https://capnco.gg/profile).
You can also mint a soulbound ecosystem badge for each ecosystem. Each badge is an NFT that levels itself up from bronze to silver to gold based on where you rank against every other player, measured by your rolling 30-day minted total for that ecosystem.
Individual ecosystems may run their own reward campaigns that look at how much ecosystem currency players mint through Captain & Company, but we do not promise or guarantee any particular campaign.