# Contract Liquidation

In cryptocurrency contract trading, **contract liquidation** refers to the process where a trading platform force-closes positions or settles them according to rules due to insufficient margin in the user's account or contract expiration. The detailed analysis is as follows:

## **I. Trigger Mechanisms for Liquidation**

**1. Forced Liquidation due to Insufficient Margin (Liquidation)**

* **Core Logic**: When the user's **maintenance margin ratio** falls below the platform's set threshold (e.g., 0.5%), the platform automatically closes the position to prevent losses from expanding.
  * **Maintenance Margin Ratio** = (Account Equity / Position Value) × 100%
* **Example**:\
  Suppose a user goes long on 100 BTC contracts (valued at 1 BTC) with 10x leverage and a margin of 0.1 BTC. If the BTC price drops by 10%, the account equity falls to 0.09 BTC. The maintenance margin ratio is 0.09/1 = 9% (assuming the platform threshold is 5%), triggering liquidation.

**2. Contract Expiration Liquidation**

* **Delivery Contracts**: Positions are force-closed at the agreed time (e.g., every Friday), and profits/losses are settled based on the **index price** (the average spot price of multiple exchanges).
* **Perpetual Contracts**: No expiration date, but the funding rate is adjusted daily (e.g., 00:00 UTC) to adjust the position costs for long and short sides, preventing significant price deviations from the spot.

## **II. Liquidation Processes and Rules**

**1. Automatic Deleveraging (ADL)**

* When extreme market volatility prevents the system from liquidating positions in time, the platform prioritizes **automatically reducing high-leverage profitable positions** instead of directly liquidating loss-making accounts to minimize the risk of over-collateralization.
* **Application Scenario**: During extreme market conditions, such as a sudden BTC rally pushing numerous short positions to the brink of liquidation.

**2. Risk Reserves and Contribution**

* **Risk Reserves**: The platform extracts a fixed percentage (e.g., 0.05%) from each transaction as a reserve to cover liquidation losses.
* **Contribution Mechanism**: If risk reserves are insufficient, remaining losses are shared proportionally by **profitable users** (some platforms have reduced contributions through optimized algorithms).

## **III. Impact of Liquidation on Users**

**1. Loss Calculation**

* **Liquidation Loss**: Typically the full or partial margin (e.g., a loss of 0.01 BTC in the example above).
* **Over-Collateralization Risk**: In extreme market conditions, the liquidation price may deviate from expectations, causing losses exceeding the margin, which must be covered by risk reserves or user contributions.

**2. Keys to Avoiding Liquidation**

* **Control Leverage**: Higher leverage increases liquidation risk (e.g., a 1% reverse price movement with 100x leverage may trigger liquidation).
* **Set Stop-Loss Orders**: Preset stop-loss prices to close positions proactively before losses expand.
* **Monitor Margin Ratios**: Stay vigilant about account risks and add margin or reduce positions promptly.

## **IV. Liquidation Differences Among Exchanges**

| Platform       | Liquidation Mechanism                                          | Risk Reserves                                    | Contribution Rules           |
| -------------- | -------------------------------------------------------------- | ------------------------------------------------ | ---------------------------- |
| Binance        | Isolated/Full Margin Liquidation, ADL Prioritizes Deleveraging | Covers most extreme scenarios                    | Rare contributions           |
| Bybit          | Partial Liquidation                                            | Over $100 million                                | No contributions since 2023  |
| FTX (Bankrupt) | Inadequate reserves led to user contributions                  | Misappropriated customer funds caused shortfalls | Ultimately led to bankruptcy |

## **V. Conclusion: Rational Approaches to Liquidation Risks**

* **Nature of Contract Liquidation**: A necessary mechanism for platforms to control systemic risks, but it may result in user principal losses.
* **Recommended Strategies**:
  1. **Leverage ≤10x**: Novices should avoid high leverage (e.g., 50-100x).
  2. **Always Set Stop-Loss**: Configure stop-loss orders simultaneously with position opening (e.g., automatic closure at 10% loss).
  3. **Diversify Funds**: Avoid allocating excessive funds to a single contract.
  4. **Monitor Market Conditions**: Reduce positions before/after major events (e.g., Fed decisions).

For further analysis of specific platforms' liquidation rules or real-time risk calculations, feel free to provide more details!