$ISA is the core fuel of the YISAYA ecosystem, used for all in-game value interactions, including: dungeon entry, NFT upgrades, gear enhancement, and Auction House trading. It is also deeply tied to the Contribution Score system, directly impacting a player's daily earnings. Future Use Case(s): In the future, the use cases for $ISA will expand to include community governance (via the Dual-Core Governance structure), access to advanced gameplay (such as 10v10 Guild Wars), and potential cross-chain ecosystem interactions.