MT5 Automation (Expert Advisors and Automated Trading)

What is automated trading on MT5

Automated trading on MT5 works through Expert Advisors (EAs), just like on MT4. An EA is a program that runs inside MT5 and makes trading decisions based on rules you define. It monitors the market, identifies trading signals, and executes orders without your manual input.

The big difference is the programming language. MT5 EAs are written in MQL5, which is more advanced than MQL4. MQL5 supports object-oriented programming (OOP), which makes it easier to write complex, well-organized code. For developers, this means cleaner programs, better error handling, and the ability to create more sophisticated strategies.

For non-programmers, the practical difference is that MT5 EAs can potentially do more complex things, though the user experience of running them is very similar to MT4.

How to install an EA on MT5

• Download the EA file (.mq5 or .ex5)
• In MT5, go to File, then Open Data Folder
• Navigate to MQL5, then Experts
• Copy the EA file into the Experts folder
• Restart MT5 or refresh the Expert Advisors section in the Navigator
• The EA will appear in the Navigator under Expert Advisors

How to run an EA on MT5

• Open a chart for the currency pair and timeframe you want the EA to trade on
• Drag the EA from the Navigator onto the chart
• In the settings window, on the Common tab, check "Allow Algo Trading"
• Configure the Inputs tab with your preferred settings
• Click OK
• Make sure the Algo Trading button in the toolbar is enabled (green)

When the EA is active, you will see an icon in the top-right corner of the chart indicating it is running.

MQL5 advantages over MQL4

Object-oriented programming. MQL5 lets you create classes, objects, and inheritance, which are tools that make complex programs easier to build and maintain. If you are developing a strategy with multiple components, OOP keeps everything organized.

Better event handling. MQL5 provides more events that your EA can respond to, such as timer events, chart events, and book events (changes in the order book). This gives you more control over when and how your EA reacts to market activity.

More built-in functions. MQL5 has a larger library of built-in functions for math, statistics, file handling, and network communication. This means less code you need to write yourself.

Better debugging. The MetaEditor for MQL5 includes a more capable debugger that makes finding and fixing errors in your code faster and easier.

Types of EAs available for MT5

The types of EAs available for MT5 are similar to MT4.

• Trend-following EAs that buy in uptrends and sell in downtrends
• Mean-reversion EAs that trade when prices deviate far from their average
• Scalping EAs that make many quick trades for small profits
• Grid and martingale EAs that use position sizing strategies (be very cautious with these)
• Multi-currency EAs that can monitor and trade multiple pairs simultaneously, a key advantage over MT4 where each EA instance runs on a single chart

Where to find MT5 Expert Advisors

• MQL5.com Marketplace has a large and growing selection of MT5 EAs
• MQL5.com Code Base offers free, open-source EAs
• Built-in access through the Code Base tab in the MT5 Toolbox
• MQL5 Freelance for hiring developers to build custom EAs
• Trading forums where community members share their creations

Important note: MT4 EAs do not work on MT5. If you have EAs from MT4, they need to be rewritten in MQL5. Some developers offer conversion services, but it is not a simple copy-paste process.

The MT5 Strategy Tester advantage

MT5's Strategy Tester is significantly more powerful than MT4's.

• Multi-threaded testing uses all your processor cores for faster backtests
• Multi-currency testing lets you test strategies that trade multiple pairs
• Real tick data can be used for more accurate results
• Forward testing lets you split the data into in-sample (for optimization) and out-of-sample (for validation) periods
• Cloud computing lets you use the MQL5 Cloud Network to run optimizations across thousands of remote computers, dramatically speeding up the process

Warnings about automated trading

The same warnings that apply to MT4 automation apply to MT5.

• No EA guarantees profits. All strategies have losing periods.
• Backtest thoroughly before going live.
• Demo test for weeks or months after backtesting.
• Avoid over-optimization. A strategy that works perfectly on past data but fails live is worthless.
• Use a VPS to keep your EAs running 24/7.
• Start with small positions to limit risk while validating the EA in live conditions. Good risk management is essential.