Contract Limit and Market Close-All Rules Update

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In an ongoing effort to enhance the stability and reliability of the OKX derivatives trading system, OKX has implemented key adjustments to the limit price rules and market close-all order logic effective January 19, 2018. These changes are designed to improve market integrity, reduce manipulation risks, and ensure smoother execution during volatile conditions.

This update applies across all cryptocurrency perpetual and futures contracts on the platform. Below is a comprehensive breakdown of the revised mechanisms, including practical implications for traders and risk management considerations.

🔧 Updated Limit Price Rules

The new limit price framework applies uniformly to all contract types and introduces dynamic pricing bands based on real-time market data. These adjustments help prevent extreme price deviations while maintaining sufficient flexibility for normal trading activity.

🕒 First 10 Minutes After Position Opening

For the first 10 minutes following the creation of a new contract position, price limits are set relative to the spot index price with a fixed ±25% buffer:

This wide initial band allows for natural price discovery during periods of high volatility or low liquidity immediately after position entry.

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⏳ After 10 Minutes: Dynamic Adjustment Based on Premium

Once the 10-minute window passes, the system shifts to a more refined mechanism that accounts for the contract premium — the difference between the derivative price and the underlying spot index.

Using this average, the system recalculates boundaries:

However, a safety cap remains in place: if the resulting price exceeds ±25% of the spot index or falls below zero, the hard limit reverts to ±25% of the spot index.

This adaptive model ensures tighter control as markets stabilize, reducing opportunities for spoofing or artificial price spikes.

🛑 Order Rejection Logic: Open vs. Close Orders

To maintain fair trading practices, different rules apply depending on whether you're opening or closing a position.

Opening Positions (Long or Short)

These constraints prevent excessively aggressive entries that could distort short-term pricing.

Closing Positions (Risk Mitigation Focus)

To deter malicious manipulation during exit attempts:

Note: Unlike opening orders, closing orders are only subject to the fixed ±25% rule regardless of the 10-minute window. This simplifies risk management during urgent exits.

💸 New Market Close-All Procedure

The "Market Close-All" function enables users to exit all open positions instantly at prevailing market rates. However, to avoid conflicts and failed executions, OKX has updated its workflow.

Previous Workflow

Previously, when a user triggered “Market Close-All,” the system would:

  1. Automatically cancel any pending close orders.
  2. Immediately place market orders to close all positions.

While efficient, this automation occasionally led to unintended order clashes or execution slippage.

Updated Workflow (Effective Jan 19)

Now, when you click “Market Close-All”:

This change ensures clarity and control by requiring manual confirmation of order cleanup before full liquidation.

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Currently, this updated feature is live on the OKX web platform (PC version). The iOS and Android mobile apps are undergoing rapid development updates. As a temporary measure:

An official announcement will be made once the updated mobile experience is released.

❓ Frequently Asked Questions (FAQ)

Q1: Why did OKX change the limit price rules?

These updates improve system resilience against flash crashes, spoofing, and other forms of market abuse. By introducing time-based and premium-adjusted pricing bands, OKX ensures fairer price formation without restricting legitimate trading activity.

Q2: Does the ±25% cap apply at all times?

Yes — even if dynamic calculations suggest wider bands, no order may exceed ±25% of the spot index price. This acts as a universal circuit breaker to prevent extreme deviations.

Q3: Can I still close my position during high volatility?

Absolutely. The ±25% restriction on closing orders is intentionally broad enough to allow exits even in highly volatile markets. Only clearly abnormal prices are blocked.

Q4: What should I do if I can’t use Market Close-All on my app?

Use the OKX website via browser on your mobile device until the app update rolls out. Ensure all pending close orders are canceled first to avoid delays.

Q5: How is the “average premium” calculated?

It’s derived from minute-level data over the past 10 minutes:
(Premium at minute 1 + ... + Premium at minute 10) ÷ 10
This rolling average smooths out noise and reflects true market sentiment.

Q6: Are these rules applied per user or globally?

The rules are enforced at the system level, meaning they apply uniformly to all users. No individual account exceptions exist, ensuring fairness and consistency.

Final Thoughts

These enhancements reflect OKX’s commitment to building a secure, transparent, and user-centric trading environment. Whether you're a day trader managing multiple positions or a long-term investor hedging exposure, understanding these updated mechanics empowers better decision-making.

Traders are encouraged to review their order strategies in light of these changes — particularly those relying on automated bots or bulk closure tools. Staying informed helps minimize disruptions and maximize execution efficiency.

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