In a significant development, Hyperliquid has released the fee structure for its outcome tokens, which are the foundation of its prediction market-style trading platform, hinting at an imminent mainnet launch. The prediction market space has witnessed tremendous growth, with trading volumes skyrocketing over 300% in 2025 to reach $63.5 billion, and Hyperliquid is developing infrastructure to compete with established players like Kalshi and Polymarket.
A key aspect of the fee structure is that opening a position is free, with fees only applicable when closing or settling a trade. The document outlines six scenarios, including minting, trading, burning, and settlement. Traders utilizing Hyperliquid's aligned quote tokens are offered preferential rates, with taker fees reduced by 20% and maker rebates increased by 50% compared to standard rates. The comprehensive fee formula has been made available for developers.
The introduction of outcome tokens, as part of the HIP-4 upgrade, will enable users to trade binary contracts on real-world events, in addition to Hyperliquid's existing perpetuals and spot positions, all within a single account, as the platform aims to rival platforms like Polymarket, which recently announced the upcoming launch of perpetual trading. Hyperliquid's previous upgrade, HIP-3, which introduced permissionless perpetuals for developers, has garnered significant traction, accounting for over 35% of the platform's total trading volume since its introduction in October 2025.
Currently, outcome tokens are only available on the testnet, with no confirmed mainnet launch date.