Incident Overview
On July 31, 2018, at 20:17:14 UTC, an abnormal liquidation order occurred in the BTC0928 futures contract involving the sale of 4,168,515 long positions. This event resulted in substantial liquidation losses and potentially high分摊比例 (loss sharing ratios).
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Understanding Loss Sharing Mechanisms
Loss sharing is a fundamental component of derivatives trading systems across the industry. Here's a simplified example:
Scenario: Users A and B each deposit 1 BTC as margin (BTC price = $1)
- User A: 10x long leverage on 10 contracts
- User B: 10x short leverage on 10 contracts
Price Movement: BTC drops to $0.10
- Theoretical profit for B: $9
- Actual payable profit: $1 (limited by A's collateral)
- Remaining $8 becomes shared loss
OKX employs multiple risk controls to minimize分摊比例:
- Pre-liquidation triggers
- Price limit mechanisms
- Liquidation orders placed at ±1% of market price
Detailed Event Timeline
Abnormal Trading Detected (July 31, 02:00 UTC)
- User ID 2051247 initiated unusually large long positions
- OKX risk team identified suspicious activity through real-time monitoring
Risk Mitigation Attempts
- Multiple communications requesting position reduction
- User refused cooperation → Account frozen
Market Impact
- BTC price plummet triggered forced liquidation
- Resulting market volatility affected other traders
Platform Response Measures
Immediate Actions
- 2500 BTC injection into risk reserve pool from OKX funds
Settlement safeguards:
- 10-minute delay if price manipulation detected
- Manual price adjustments when necessary
- Account freezes for violators
Upcoming System Upgrades (2018 Roadmap)
August 4: Anti-Manipulation Strategy
| Mode | New Requirements |
|---|---|
| Cross-Margin | Position-based collateral requirements ↑ |
| Isolated | Maximum position limits ↓ |
Formula Simplification:
New Cross-Margin Formula:
Margin Ratio = Account Equity / (Required Margin + Frozen Order Margin)
New Isolated Margin Formula:
Margin Ratio = (Fixed Margin + PnL) * Entry Price * Leverage / (Contract Value * Position Size)August 31: Mark Price Implementation
Calculation:
Spot Index Price + EMA(Contract Market Price - Spot Index Price)Benefits:
- Smoother price transitions
- Reduced manipulation vulnerability
September: Tiered Risk System
Position-based collateral:
- Larger positions → Higher maintenance margins
Partial liquidation:
- Gradual position reduction vs. full liquidation
September: Risk Reserve Optimization
- Immediate loss coverage at predetermined thresholds
- Improved order re-pricing mechanisms
- Weekly loss sharing when reserves are insufficient
FAQs
Q: How does OKX detect abnormal trading?
A: Our systems monitor for unusual volume spikes, position concentrations, and manipulative order patterns across 200+ metrics.
Q: What happens to manipulated profits?
A: Per Section 6.2 of our agreement, we reserve the right to cancel trades and freeze associated funds.
Q: How can users verify settlement fairness?
A: All settlement data is recorded on-chain with transparent auditing procedures.
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Commitment to Improvement
OKX remains dedicated to:
- Enhancing market stability
- Protecting trader interests
- Maintaining transparent operations
We welcome community feedback at [email protected] as we continue refining our systems.