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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 20

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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Just a Donchian channel with slope. If xslope=0 it becomes the Donchian channel. It uses the moving average of Momentum.

The script tests the computer in 45 performance tests. It is possible to compare the performance of VPS/VDS servers.

This ZigZag indicator uses dual buffers to store high and low points.

EA opens trades from support and resistance levels, which were set by a trader, and revolves them at another levels.

Close At Time is an EA that closes open positions or deletes pending orders or both. You can also specify how it should be closed – by symbol, magic number or ticket number.

The strategy of this EA is daily breakout which is compare previous high or low previous day candle then place a pending order for breakout.

This program is a basic version of the original code of relatively simple system Millenium.

This is a working singleton code example. A singleton object is created when there 'can be only one' of the object.

Copying utility with minimal functionality.

EA opens trades from support and resistance levels which were set by a trader.

Fibonacci indicator drawing levels on previous day.

Indicator S&R based on OHCL candles.

Traditional MACD indicator with a Momentum indicator and alarms. Allows customization of most of the parameters without having to dive into code.

This EA will help you to set Stop Loss and Take Profit.

The EA looks for trend using three MAs (period 200, 50, 25 or other) and opens orders using the Parabolic SAR indicator. There is martingale in an Expert Advisor, the lot is calculated in percents from a deposit depending on Stop Loss.

Instant execution button to close profit orders, close all orders, auto close by trailing parameter. Last update: 21 April 2016. Prev: 8 Dec 2015

My version of Squeeze Indicator for MetaTrader 4. This indicator is based on a strategy mentioned in John Carter's book, Mastering the Trade. It is also a fully improvised version of Squeeze_Break indicator by Des O'Regan.

A robust EA template to use with your entry conditions.

Easy EA for closing positions of the symbol with profit or loss. You can use it for hidden SL too.

An EA template to add a simple trailing stop to your strategy.

MQL4 library that allows authenticating into a MetaTrader 4 account programmatically in release 880+.

Bollinger Bands with customizable moving average method and applied price.

This script creates a .CSV file of your order history so you can import it into Excel and analyse it using the calculated heat map slots and other calculated values. All trading attributes are extracted from the history and output to the .CSV file. Updated version 1.03 (about 27KB) has NetProfit, OpenDay, OpenHour, OpenSlot, CloseDay, CloseHour, CloseSlot, DurationMinutes, PotentialWinPips, PotentialLossPips and others. The file is tab delimited for easier conversion from text to columns in Excel. Times are server time. Handles 4 and 5 digit brokers and 2/3 and 4/5 point value pairs, e.g. JPY correctly.

This version of CCI indicator uses median line of the Step Channel indicator.

Money Management / Pivot / Daily Open / Support-Resistance / Grid / Information of all kind / Tendency indicator.

This an H1 strategy. This EA will execute at the new bar if the last bar has broken through the point that we set.

This indicator shows Step Channel based on volatility.

This EA will show the button that can used to close all orders by the current chart symbol.

Money Manager Graphic Tool shows Lot Size, Ratio, Risk and opens orders (Buy, Sell, Buy Stop, Buy Limit, Sell Stop, Sell Limit).

This indicator plots the values of the user specified ATR period for all timeframes as a text block. The text block corner can be changed by the user.

Draws a Triangular Moving Average on the chart.

This indicator shows Wedge pattern.

Simple button to change the timeframe directly in the chart.

FuzzyNet library for developing fuzzy models was written in C#. While converting to MQL4, 8 membership functions and 4 defuzzification methods for Mamdani-type systems were added to the library.

This indicator shows 3 periods ATR LWMA.

This new representation helps to see charts in a new different way.

Simple way to control your orders.

Library provides functions for management of MetaTrader 4 to MySQL database connections. Fixed memory allocation and release problems of the original library.

This indicator shows Flag and Pennant patterns.

Easily create horizontal lines by 1 key stroke, choose the color of the resistance line and the support line, the indicator automatically changes the color when a line is crossed, you can be alerted when a line is crossed. You can see the history of support and resistance of the line.

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