Portfolio margin on Hyperliquid has been live for six months and is now in beta with increased limits.

Users with account value <$25M can use BTC and HYPE as collateral to trade perps, spot, and outcome markets with greater capital efficiency.

See the Docs for borrow and supply caps, account requirements, and more: https://hyperliquid.gitbook.io/hyperliquid-docs/trading/portfolio-margin
See the Support Guide for frequently asked questions: https://hyperliquid.gitbook.io/hyperliquid-docs/support/faq/portfolio-margin