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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4

The largest library features codes of free trading Expert Advisors, technical indicators and scripts. With the available applications you can trade in automated mode and analyze price dynamics. Use the library of codes to learn more about financial market sentiments.

Download free applications, test them and run in your MetaTrader 4. You can access them from the MetaTrader 4 platform and the MetaEditor development environment.

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This robot optimizes the values it uses for overbought and oversold based on what would have been profitable during the Optimization periods(bars) back. Using the strategy of selling when the index indicator crosses below overbought and buying when the index indicator crosses above oversold.

This indicator allows you to see the Moving Averages from different timeframes on the same chart. It helps you to spot the dynamic levels of support and resistance. It uses a custom window with check boxes to show/hide the different Moving Averages without need to access the indicator settings window.

Uses the analysis of 4 indicators.

Class for working with synchronization events.

Displays the number of each bar - both, relative to the most current bar and in absolute terms from the beginning of the chart.

This custom indicator will show you 28 pair's daily candle range, High-Low range, candle bullishness or bearishness from real tick market. So you can understand the overall market situation very short time. You can change the default timeframe from Daily to any period and default candle (bar) number from 0 to any previous number. Also you can open the required symbol by clicking the symbol button.

Regular expressions provide a formal language for quick and flexible processing of texts. Each regular expression is a pattern (mask), for which the regular expression engine tries to find matches in the source text. A pattern consists of one or more character literals, operators, or constructs.

Not really profitable but the code fits on one page.

Previous Candle Hi-Lo is used to check the last candle multi-timeframe position relative to the current price.

As simple Regression Channel code for MetaTrader 4.

The functions included in this template use two news sources - Investing.com and Dailyfx.com. The template doesn’t use DLL.

Shows when two or three consecutive bull or bear candles of a certain size print after qualifying the stochastic level of the initial candle in the series.

Get a grasp of the current trend by candle colors.

Indicator to trade divergence. One of 30 indicators can be selected.

A class system to represent a hidden stop loss and take profit system, combined with 4 example files showing the use of the classes.

The indicator marks the days of the week with a colored histogram in the chart sub-window.

The example of multicurrency hedging implementation on a single chart in Metatrader 4.

Expert Advisor for pyramiding into big and fast market movements.

Automatic placing of Buy Stop pending order and Sell Stop pending order simultaneously, Stop Losses and Take Profits on the user specified levels. As soon as the long position (BUY) is opened as ASK price crosses the levels, the remaining pending order (SELLSTOP) is deleted. Vice versa if the short position (SELL) is opened as BID price crosses the levels, the remaining pending order (BUYSTOP) is deleted. It places again both pending orders after the opened order has been closed.

Use Chaos Theory to trade!

The EA using single layer Perceptron.

Open two buttons on a chart, one for closing all shorts, one for closing all longs. The buttons labels display the current total profit for each type of order.

Stores and implements a basic hidden Stop Loss and Take Profit system.

Relative Strength Oscillator or RSO is an Oscillator version of RSI.

This indicator allows you to define a checklist for you to manually check and confirm your strategy before entering into a trade.

A simple EA based on Tipu Trend indicator and Tipu Stops indicator.

This is a multi timeframe indicator for Bollinger Bands. With it you can plot the Bollinger Bands of the higher timeframes without changing the current chart. This allows you to more clearly understand the price context by seeing the levels of the other timeframes on the same chart.

FileLog class for efficient logging at different Levels.

This script removes all instruments with spread higher than the specified maximum requested and it also removes all non-trade enabled instruments from Market Watch, which allows you to concentrate on items you may want to trade without all the clutter.

This indicator helps to move charts one by one to the the front, just like slide show,and make your hands free.

A channel based on standard deviation of close price.

This is a binary options simulated trading indicator on MetaTrader 4 client, novice traders can use to practice trading strategies, program interface have simplified Chinese and English.

Tipu MACD is one the popular indicators in the Market. The original code for Tipu MACD is modified by removing compatibility with Tipu Panel. This version of Tipu MACD is open for everyone who is interested in developing an Expert Advisor.

Test ChartEvent is an example demonstrating the various types of ChartEvent: keyboard keys events, mouse click & move events, custom events. The source code works both in MetaTrader 4 and MetaTrader 5.

Trailing stop allows you to automatically protect the profits with your positions. It adjusts itself according to the current market rate and the amount of pips you give it to trail behind.

This EA opens Buy or Sell trades in strongest or weakest pair. It cannot be backtested.

This expert will copy a trade with the preset volume on the same account, can be used with a signal. No cross-account functionality.

Automatic Fibonacci with ZigZag Base.

Example of Heiken Ashi Using Multi Time Frame (MTF).

RSI accumulated (floating levels).

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