Margin

Margin is the collateral backing a leveraged position, and Hyperliquid lets you choose whether that collateral is shared across your whole account or walled off to a single position. Cross margin uses your full balance as a buffer against liquidation; isolated margin caps the damage to what you put up for that one trade. Neither choice changes your leverage, only what happens when a trade goes wrong. These guides explain how each mode calculates liquidation price and when isolating a position actually protects the rest of your account. Decide which mode you want before you open a position, since switching mid-trade is rarely as clean as picking it up front.