Struct IsolatedPosition 

pub struct IsolatedPosition {
    pub qty: Decimal,
    pub avg_entry_px: Decimal,
    pub leverage: Decimal,
    pub isolated_margin_reserved: Decimal,
    pub maintenance_margin_rate: Decimal,
    pub realized_pnl: Decimal,
    pub fee_paid: Decimal,
}

Per-instrument isolated margin position.

Tracks all state needed for accurate perp simulation: position size, average entry, reserved margin, PnL, and fees.

Fields

qty: Decimal

Signed position quantity: positive = long, negative = short

avg_entry_px: Decimal

Weighted average entry price

leverage: Decimal

Leverage for this position (e.g., 10x)

isolated_margin_reserved: Decimal

USDC locked as isolated margin for this position

maintenance_margin_rate: Decimal

Maintenance margin rate = 1 / max_leverage Used for liquidation price calculation

realized_pnl: Decimal

Accumulated realized PnL from partial/full closes

fee_paid: Decimal

Accumulated fees paid

Implementations

impl IsolatedPosition

pub fn unrealized_pnl(&self, mark_price: Decimal) -> Decimal

Unrealized PnL at given mark price. Long: profit when price goes up. Short: profit when price goes down.

pub fn liquidation_price(&self) -> Option<Decimal>

Liquidation price for this isolated position (Hyperliquid formula).

For a long position: liq_price = entry - margin_available / |qty| / (1 - mmr) For a short position: liq_price = entry + margin_available / |qty| / (1 + mmr)

Returns None if position is flat.

pub fn required_margin_for_order( notional: Decimal, leverage: Decimal, fee_rate: Decimal, ) -> Decimal

Required initial margin for a new order at given notional and leverage. Includes a fee buffer for entry + exit (2x fee_rate).

pub fn is_liquidated(&self, mark_price: Decimal) -> bool

Check if this position is liquidated at the given mark price.

A long is liquidated when mark drops below liq_price. A short is liquidated when mark rises above liq_price.

pub fn is_order_reducing(&self, order_side: OrderSide) -> bool

Check if an order on this instrument is reducing the current position.

Trait Implementations

impl Clone for IsolatedPosition

fn clone(&self) -> IsolatedPosition

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for IsolatedPosition

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for IsolatedPosition

fn default() -> Self

Returns the “default value” for a type.