Q1. What is the difference between a limit-on-close order and a market-on-close order?

A: A limit-on-close (LOC) order executes at the market close only if the closing price meets your limit price. A market-on-close (MOC) order executes at the closing price regardless of the final price.

Q2. Can you cancel a limit-on-close (LOC) order?

A: Yes. You can usually cancel an LOC order before the exchange's cancellation deadline. After that cutoff time, the order typically cannot be changed or canceled.

Q3. What time do LOC orders need to be placed before market close?

A: The deadline depends on the exchange. Most stock exchanges require LOC orders to be submitted several minutes before the market closes, based on their trading rules.

Q4. Do cryptocurrency exchanges support limit-on-close orders?

A: Most cryptocurrency exchanges do not support traditional LOC orders because crypto markets trade 24/7 and do not have an official daily market close.

Q5. What happens if an LOC order doesn't execute at market close?

A: If the closing price does not meet your limit price, the LOC order expires and is canceled without being executed.

What Is an LOC Order? Implementation Guide for Crypto Exchange Development

154 Views

2646 Total Words

14 mins read

Have Questions or Doubts?

Talk To Our Expert

In today's fast-moving crypto market, traders need more control over when and how their orders are executed. A Limit On Close (LOC) order helps by allowing a trade to execute only at the market's closing price or at a better price within the trader's chosen limit. This order type is widely used by professional traders who want better price control and a more planned trading strategy. As crypto exchanges continue to add advanced trading features, LOC orders are becoming an important part of creating a high-performance and competitive platform. Adding this feature can improve the trading experience, support advanced trading strategies, and attract more active and institutional users.

In this blog, we will explain what a Limit On Close (LOC) order is, how it works, why it is valuable for crypto exchange development, and the key steps to implement it successfully.

What Is a Limit-On-Close (LOC) Order?

A Limit On Close (LOC) Order is a trading order that executes only during the market's closing session and only if the closing price is equal to or better than the limit price set by the trader. It gives traders more control over the final execution price, making it a useful option for reducing the risk of unexpected price changes at the end of a trading session. On crypto exchanges that support closing auctions or scheduled market close events, an LOC order helps traders exit or enter positions at a preferred price.

Executes only during the market's closing session when the limit price condition is met.
Gives traders better control over the final trade price while helping reduce end of session price volatility.
Best suited for traders who want to buy or sell at a specific closing price without accepting an unfavorable execution.

How LOC Orders Work: Key Mechanics?

A Limit on Close (LOC) order allows you to buy or sell a stock at the end of the trading day while keeping control over the price. You set the highest price you are willing to pay or the lowest price you are willing to accept, and the order waits for the market's closing auction. The trade is completed only if the official closing price meets your limit price or offers a better price. If your price condition is not met, the order expires without execution.

Set your preferred limit price before the market closes.

The order remains pending until the official closing auction starts.
The trade executes only at your limit price or a better closing price.
The order is canceled automatically if the closing price does not meet your limit.
LOC orders help you participate in the market close while maintaining greater control over your execution price.

LOC (Limit-On-Close) vs. Market-On-Close (MOC) Orders

Trading during the market's closing session requires the right order type because the final execution price can directly affect your trading outcome. LOC (Limit-On-Close) and Market-On-Close (MOC) orders are both executed during the official market close, but they follow different execution rules. A LOC order gives you control over the closing price by executing only if your specified limit is met, making it suitable for traders who prioritize price accuracy. In contrast, a MOC order is designed to execute at the official closing market price without a price limit, making it a preferred choice for traders who want a higher probability of completing their trade before the market closes. Understanding the difference between these two order types helps traders select the right strategy based on their trading goals, market conditions, and risk tolerance.

Comparison Factor	LOC (Limit-On-Close) Order	Market-On-Close (MOC) Order
Execution Timing	Executes during the market closing auction if the limit price is met.	Executes during the market closing auction at the official closing price.
Price Control	Yes, trades only at the specified limit price or a better price.	No, executes at the final closing market price.
Execution Probability	Lower because the order executes only when the price condition is satisfied.	Higher because the order is intended to execute at the market close.
Primary Purpose	Protect the desired buying or selling price.	Complete the trade before the market closes.
Best For	Traders who value price precision over execution.	Traders who value execution certainty over price control.
Risk Consideration	The order may remain unfilled if the closing price does not meet the limit.	The final execution price may differ from expectations due to market movement.

Relevance of LOC Orders to Crypto Exchange Development

Limit On Close (LOC) orders are an important feature in crypto exchange development because they give traders more control over how their trades are completed at the market close. Users can set a specific price limit, which helps them avoid trades that do not match their trading goals. This creates a more planned and confident trading experience.

Adding LOC orders makes a crypto exchange more useful for both beginner and experienced traders. It supports advanced trading strategies, improves order execution during the closing session, and gives users more flexibility when managing their positions. A platform with advanced order types is better prepared to meet the needs of today's fast moving crypto market.

As competition in the crypto industry continues to grow, advanced trading features have become a key part of successful crypto exchange development. LOC orders improve the overall trading experience by offering greater price control and more accurate trade execution. Including this feature helps create a professional, user focused trading platform that attracts active traders and supports long term platform growth.

Use Cases for LOC-Style Orders in Crypto Exchange Development

LOC-style (Limit-On-Close) orders help traders execute buy or sell orders at the end of a trading session while following a predefined price limit. The order is completed only when the official closing price meets the trader's price condition. If the closing price falls outside the selected limit, the order expires automatically without execution. This order type gives traders better price control, reduces unnecessary trading risk, and adds greater precision to end-of-session trading on modern crypto exchange platforms.

Key Use Cases for LOC-Style Orders

1. Buy Crypto at a Preferred Closing Price

A trader can set the highest price they are willing to pay before the trading session closes. The order executes only if the official closing price is equal to or lower than the specified limit. This approach helps traders avoid paying more than their planned investment amount while maintaining better control over trade execution.

2. Sell Crypto at a Desired Closing Value

Investors can define the minimum price they are willing to accept when selling a cryptocurrency. The order is executed only if the closing price reaches or exceeds that value. This helps protect expected returns and prevents assets from being sold below the trader's target price.

3. Rebalance Investment Portfolios with Better Price Control

Institutional investors and portfolio managers often adjust their crypto holdings at the end of a trading session. LOC-style orders allow them to buy and sell assets within predefined price limits, making portfolio rebalancing more accurate while supporting long-term investment strategies.

4. Reduce Risk During High-Volume Market Close

The final minutes of a trading session often experience increased trading activity and rapid price movements. LOC-style orders help traders avoid unexpected executions by allowing trades to occur only when the closing price matches their selected limit. This supports more disciplined and predictable trading decisions.

5. Improve Algorithmic and Institutional Trading

Many professional trading firms use automated trading systems that rely on strict execution rules. LOC-style orders fit these strategies by combining end-of-session execution with predefined price limits. This allows trading algorithms to follow precise instructions without accepting unfavorable closing prices.

6. Support Advanced Order Management

Adding LOC-style orders gives a crypto exchange a more complete order management system. Traders gain access to advanced execution options that improve flexibility, while the platform becomes more attractive to experienced traders, institutional investors, and businesses looking for professional-grade trading features.

Core Benefits of LOC Order Implementation in Crypto Exchange Development

Clear Price at Close

A Limit On Close (LOC) order executes only at the trader's selected price or a better price during the market close. This gives traders better price control and helps them make more confident trading decisions.

Less Slippage at Close

Price movements can become unpredictable near the market close. LOC orders help reduce slippage by preventing trades from executing outside the trader's chosen price range.

Builds Trader Trust

Traders value platforms that provide accurate and transparent order execution. Adding LOC orders improves trading confidence and encourages users to stay active on the exchange.

More Liquidity Near Close

LOC orders attract more buy and sell activity during the closing session. Higher liquidity improves order matching, supports smoother trade execution, and creates a more active market.

Stops Price Manipulation

LOC orders use price limits that help protect traders from sudden price spikes or sharp market swings near the close. This supports fair trading and improves overall market stability.

Easier Portfolio Rebalancing

Many investors rebalance their portfolios using closing market prices. LOC orders allow them to adjust their holdings while staying within their preferred price range, making portfolio management more accurate.

Adding LOC order functionality is a smart choice for any crypto exchange development company building a professional trading platform. It gives traders better price control, improves market fairness, increases trust, and creates a more reliable trading experience that supports long term platform growth.

Technical Architecture for LOC Orders in Crypto Exchange Development

Order Book Integration Requirements

A crypto exchange must support LOC orders without affecting normal trading activity. The order book should validate each order, record it with a time stamp, and hold it in a separate queue until the scheduled closing session begins.

This approach keeps the order book organized, reduces processing errors, and helps the matching engine execute eligible orders at the right time.

Defining a "Close" Event in a 24/7 Market

Because cryptocurrency markets operate 24/7, there is no natural market close like traditional stock exchanges. A crypto exchange development platform should define a fixed closing event based on exchange rules, daily settlement times, or a scheduled trading session.

A clearly defined closing event gives traders a predictable execution window and allows LOC orders to work consistently across all supported markets.

Matching Engine Logic for LOC Orders

The matching engine should process LOC orders only after the closing event starts. An order is executed only if the final closing price meets the trader's specified limit price.

This execution logic protects pricing accuracy, prevents early execution, and helps maintain a fair trading environment for every participant.

Handling Order Rejections and Edge Cases

The system should reject LOC orders with invalid prices, unsupported trading pairs, duplicate requests, or orders submitted after the closing cutoff time. Every rejected order should return a clear reason so traders understand what happened.

The platform should also handle low liquidity, unmatched orders, partial fills, and temporary system interruptions without affecting overall trading performance. Clear order status updates improve transparency and user confidence.

A well-designed technical architecture is essential for accurate and consistent LOC order execution in crypto exchange development. WeAlwin builds secure and scalable trading platforms with intelligent order management, efficient matching engine logic, and stable execution workflows that provide a smooth trading experience.

Step-by-Step Process for LOC Order Implementation in Crypto Exchange Development

Step 1: Define Business Requirements and Compliance Scope

Start by defining your business goals, trading rules, supported markets, and compliance requirements. A clear plan helps the exchange implement LOC orders that match both business needs and regulatory standards.

Step 2: Design the Order Type Schema

Create a structured order model that includes the limit price, order status, execution conditions, expiration rules, and market close settings. A well-planned schema improves data accuracy and keeps order processing consistent.

Step 3: Build Matching Engine Support

Update the matching engine to recognize LOC orders and execute them only during the market closing session when the limit price conditions are satisfied. This improves execution accuracy and keeps trading operations consistent.

Step 4: Integrate with the Order Management System (OMS)

Connect LOC orders with the Order Management System (OMS) to manage order validation, routing, tracking, updates, and execution. This integration gives traders and administrators better visibility throughout the entire order lifecycle.

Step 5: Develop Front-End and API Support

Add LOC order options to the trading platform and APIs so users and third-party applications can place, monitor, and manage orders with ease. A simple and intuitive interface improves the overall trading experience.

Step 6: Testing, Simulation, and Backtesting

Test the feature in different market conditions using functional testing, simulations, stress testing, and historical backtesting. This process verifies that LOC orders perform correctly before the feature is released to live users.

Step 7: Deployment and Continuous Monitoring

Deploy the LOC order feature in a production environment and continuously monitor execution quality, system performance, and trading activity. Regular monitoring helps identify issues early and supports stable, reliable platform operations.

A well-planned implementation process helps crypto exchanges deliver accurate market-close execution, smooth order management, and a better trading experience. As a trusted crypto exchange development company, WeAlwin builds secure and scalable exchange platforms with advanced LOC order functionality that supports long-term business growth and dependable trading performance.

Security Considerations When Implementing LOC Orders

Security is a key part of implementing Limit-on-Close (LOC) orders because every order must remain accurate and protected until the market closes. Trading platforms should use multi-factor authentication, data encryption, secure API connections, and role-based access controls to prevent unauthorized access and protect sensitive trading information. These security measures help maintain order accuracy and build user trust throughout the trading process.

Platforms should also monitor trading activity in real time to detect unusual order behavior, suspicious login attempts, or potential cyber threats before they affect order execution. Regular security audits, vulnerability assessments, detailed audit logs, and continuous system monitoring help maintain platform stability, support regulatory compliance, and provide a secure trading experience for investors using LOC orders.

Common Challenges in Crypto Exchange Development for LOC Orders

Getting the correct market closing price is one of the biggest challenges. Even a small delay or inaccurate price feed can cause LOC orders to execute incorrectly or remain unfilled.
Processing a large number of LOC orders at the market close requires a fast and scalable trading engine. Slow performance can create delays and affect the overall trading experience.
Building accurate order matching logic is essential. The platform must execute an LOC order only when the official closing price matches or improves the trader's selected limit price.
Protecting the exchange from suspicious trading activity and market manipulation while meeting compliance requirements is important for maintaining a secure and trusted trading environment.
Keeping the trading platform stable during peak market activity can be difficult. Low latency, reliable APIs, and uninterrupted order processing are important for consistent LOC order execution.

Final Touch

A Limit on Close (LOC) order is more than just another order type. It gives traders better control over how their trades are executed at the market close while helping them manage price expectations. For crypto exchange owners, adding LOC orders improves the trading experience, supports smarter order execution, and makes the platform more attractive to active and professional traders. As the crypto market continues to grow, advanced trading features like LOC orders can help your exchange stay competitive and meet changing user expectations. If you are looking to build a secure, scalable, and feature-rich trading platform, partnering with WeAlwin, a trusted crypto exchange development company, is a smart step toward launching a high-performance crypto exchange.

Integrate LOC orders to give traders greater control over market-close trade execution.
Build a secure and scalable crypto exchange with advanced trading features and smooth order management.
Provide a professional trading experience that supports business growth and long-term user engagement.

Ready to build a crypto exchange with advanced LOC order functionality? Contact WeAlwin, a trusted crypto exchange development company, and launch a secure, scalable, and high-performance trading platform that meets today's market demands.