N1 Engine Changelog

v15

Added

• Posted reduce-only orders for perps — now supports Limit and PostOnly (in addition to IOC and FOK)
• In-engine reduce-only maintenance — resting orders are automatically shrunk or cancelled (worst price first) to prevent over-allocation or position flips
• New backstop take-all liquidation path for deeply distressed accounts
• New liquidation visibility surfaces — websocket updates and take history
• Partial-cancel propagation for resting orders — in-place size reductions are now visible downstream
• WebSocket topic: liquidations
• HTTP endpoints: /accounts/liquidations/takes, /markets/live, /health
• Atomics now support cancel by client ID
• Nord.subscribe({ liquidations: true }) in TypeScript SDK

Modified

• Terminal liquidation now flows through take-all / backstop instead of the legacy final-step liquidation
• Position and order payloads now expose more accurate post-maintenance state — original size, current size, trading PnL
• Liquidation history now reports terminal events as BankruptcyOrTake

Removed / Replaced

• Legacy final liquidation actions / receipts — replaced by the new take-all flow and its related events

Wire Changes

• PlaceOrderResult adds reduced_orders
• Account websocket updates add reduced_orders
• OrderUpdate now uses currentSize
• OpenOrder exposes originalOrderSize
• PositionSummary.perp uses PerpPositionUpdate
• PerpPositionUpdate adds tradingPnl (sizePricePnl deprecated)
• Liquidation history terminal kind is now BankruptcyOrTake

SDK Updates

• @n1xyz/nord-ts → 0.4.2
• placeOrder() returns normalized fill data
• WebSocket clients now emit liquidation events

API References

• OpenAPI Spec 
• Protobuf Schema