> For the complete documentation index, see [llms.txt](https://wp.warped.games/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wp.warped.games/sui-network/closed-loop-tokens.md).

# Closed-Loop Tokens

In-Game Economies On-Chain

Closed-loop tokens are digital currencies that operate exclusively within a specific ecosystem. Because they cannot be traded externally, their value stays stable and tied directly to in-game use, creating a predictable and player-friendly economy.

**Koju**

In Warped Universe, Koju functions as a closed-loop currency used solely for purchasing cosmetics and Nexus Passes. It behaves like any standard in-game currency. All transactions are handled seamlessly in the background, so players never need to interact with wallets or approve transactions manually.

This keeps the in-game economy stable and familiar regardless of what is happening in broader markets, while still giving us the infrastructure benefits of running it on the Sui Network.