The test network is running first, and the bounty program is still ongoing—this official move both expands the access channels and leaves safety redundancy in place, making it far more reliable than rushing straight into the mainnet.

Hyperliquid announces support for USDT as a borrowable asset for Portfolio Margin on the testnet, and will officially launch on the mainnet after the next mainnet upgrade. The official also states that vulnerabilities related to Portfolio Margin are still applicable to the mainnet bug bounty program. Previously, Hyperliquid's margin system was primarily built around USDC.