In the dynamic world of cryptocurrency trading, managing risk is paramount. For traders using leveraged products like perpetual swaps, understanding platform-specific risk management mechanisms is crucial. This guide explains the forced partial reduction rules for Coin-Margined Perpetual Swaps on a major exchange, designed to protect both the user and the market from extreme volatility and liquidation events.
What is Forced Partial Reduction?
Forced partial reduction is a risk control measure implemented to mitigate the market impact and potential insurance fund losses that can occur when large positions are liquidated entirely. Instead of triggering a full liquidation immediately when a position becomes under-margined, the system may reduce the position size incrementally. This process helps avoid creating excessive market slippage and protects the overall stability of the trading environment.
The primary goal is to lower a large, high-level position by two levels (or "tiers") to a point where its margin ratio becomes healthy again, thus preventing immediate and total liquidation.
Detailed Rules for Forced Partial Reduction
The process is triggered under specific conditions related to your position's "level" or "tier" and its margin ratio.
Trigger Conditions:
A forced partial reduction occurs when a user's position is at Level 3 or higher and its margin ratio falls below the maintenance margin ratio + taker fee rate for its current level. However, this only happens if the margin ratio is still above the maintenance margin ratio + taker fee rate required for the lowest level (Level 1).
The Reduction Process:
Once triggered, the system calculates the number of contracts that need to be reduced to lower the position's level by two tiers. This partial reduction is executed automatically. After the reduction, the system rechecks the new margin ratio against the requirements of the new, lower level.
- If the margin ratio now meets the maintenance requirement for the new level, the process stops.
- If the margin ratio is still insufficient, the forced partial reduction cycle repeats until the position is either fully liquidated or becomes properly margined.
Partial Reduction in Isolated Margin Mode
In Isolated Margin mode, the entire margin for a position is isolated and designated for that specific trade.
The Process:
- The system places a forced reduction order for the calculated number of contracts at a price slightly better than the last traded price.
- During this process, the affected position is frozen. You cannot perform any operations on this specific contract and direction (e.g., adding margin, closing the position manually).
After a short period (approximately one minute), the system checks the order's status:
- If the order fills (fully or partially) and the resulting margin ratio becomes sufficient for the new position level, any remaining unfulfilled reduction orders are canceled. The process stops, and the position is unfrozen.
- If the order does not fill, or if the margin ratio remains insufficient after a partial fill, the system cancels any outstanding orders. It then recalculates based on the current market price and position size and repeats the forced partial reduction process.
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Partial Reduction in Cross Margin Mode
In Cross Margin mode, the entire balance of your perpetual swap wallet for that coin is used as margin for all positions in that coin, which allows for more flexibility but also carries different risks.
For Single-Direction Positions:
If you hold only long or short positions for a specific coin-margined contract, the forced partial reduction process is identical to the one described for Isolated Margin mode.
For Hedged Positions (Holding Both Long and Short):
If you simultaneously hold both long and short positions for the same coin-margined contract, the process is more efficient:
- The system first nets off the overlapping amount between your long and short positions. This means it effectively closes the hedged portion at the market price.
It then checks if the margin ratio after this netting is sufficient for the remaining position's new level.
- If sufficient, the process stops.
- If insufficient, the standard forced partial reduction process continues for the remaining unhedged position.
During any forced partial reduction process in Cross Margin mode, your entire perpetual swap wallet for that specific coin is frozen and cannot be used for transactions.
Understanding Full Liquidation (Forced Close)
Forced partial reduction is a preventative measure. If a position deteriorates beyond the point where partial reduction can help, it will be fully liquidated.
Rules for Full Liquidation
A full liquidation is triggered in two scenarios:
- For positions at Level 2 or lower: When the margin ratio falls below the maintenance margin ratio + taker fee rate for its current level.
- For positions at Level 3 or higher: When the margin ratio falls below the maintenance margin ratio + taker fee rate required for Level 1 (the lowest level).
When triggered, the system delegates the entire position to the liquidation engine to be closed at the bankruptcy price—the price at which the remaining margin for that position is completely exhausted.
This mechanism is designed to prevent a cascade of liquidations and "auto-deleveraging" (ADL) events that can occur during periods of extreme volatility.
Mode Specifics:
- Isolated Margin: The specific under-margined position is liquidated.
- Cross Margin: All positions for that specific coin-margined contract are liquidated.
The Role of the Insurance Fund
The insurance fund (or risk准备金) is a critical component of the exchange's risk management system.
- Surplus from Liquidations: When a position is liquidated at the bankruptcy price, if the execution price is better than the bankruptcy price, a surplus is generated. This surplus is injected into the insurance fund.
- Covering Losses: If a position is liquidated at a loss worse than the bankruptcy price (a "flash crash" loss), this loss is first covered by the insurance fund.
Auto-Deleveraging (ADL) and Socialized Loss
If a liquidation event results in a loss so significant that it cannot be fully covered by the insurance fund, a process called auto-deleveraging or loss socialization is initiated.
The Process:
- The system calculates the total flash crash loss.
- The insurance fund is used to cover as much of the loss as possible.
- If a loss remains, it is socialized among all profitable traders on that specific contract from the previous 24 hours.
- The分摊 ratio is calculated as:
(Total Loss - Insurance Fund) / Sum of All Profitable Users' Net Profit. - Each profitable user's share of the loss is deducted directly from their realized profits.
This ensures losses from extreme, unpredictable market events are distributed fairly across the community of traders who profited from the same market.
Frequently Asked Questions
Q: What's the main benefit of forced partial reduction?
A: It prevents large "whale" positions from being dumped on the market all at once, which minimizes slippage and protects both the position holder and other traders from excessive price impacts during liquidations.
Q: Can I stop a forced partial reduction once it starts?
A: No. Once the process is triggered, your position or wallet is frozen until the reduction is complete or the position is deemed healthy again. You cannot add margin or manually intervene during the process.
Q: How does cross margin mode affect my risk?
A: While cross margin prevents liquidation from isolated price moves in one position, it also means a major loss in one contract can put your entire wallet balance for that coin at risk, potentially leading to the liquidation of all your positions in that coin.
Q: Is the bankruptcy price the same as the liquidation price?
A: No. The liquidation price is the point where your maintenance margin is breached, triggering the risk process. The bankruptcy price is the theoretical price where your initial margin is completely depleted; it's the price at which the exchange's liquidation engine takes over.
Q: How can I avoid forced reduction or liquidation?
A: Maintain a healthy margin ratio by using appropriate leverage, monitoring your positions closely, and adding funds to your margin balance if the market moves against you. Using stop-loss orders can also help manage risk proactively.
Q: Where does the money in the insurance fund come from?
A: The insurance fund is primarily funded by the surplus generated from liquidations that are executed at a price better than the bankruptcy price.