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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 161


This is the largest free source code library for MetaTrader 5 platform programs. Here you can find ready-made Expert Advisors, technical indicators, scripts and libraries. Use the code library when learning MQL5 language and develop your own automated trading applications based on the provided codes.

You can freely download and test published codes, as well as launch them in MetaTrader 5. The library is also available directly from MetaTrader 5 platform and MetaEditor development environment.

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This library allows an easy interface to MySQL.

Dedicated functions to read and write object properties.

The Momentum Technical Indicator measures the change of price of a financial instrument over a given time span.

QEMA - Quadruple Exponential Moving Average.

PEMA - Pentuple Exponential Moving Average.

The function that calculates the lot size depending on the amount of money in the deposit currency being used.

The function that decrypts the code of the trade operation result for the functions OrderSend() and OrderCheck().

Two-Line MACD. This indicator is available by default in a great deal of trading platforms. But it cannot be found in Metatrader 5.

Class for working with matrices.

Script to create wide screenshots.

Indicator of market instability.

Tools for monitoring spread of currency pairs

This indicator calculates last average price for a symbol and determines the trend direction, so it can be a signal to commit a trade operation.

Opens a virtual hedge position in MetaTrader 5.

This is a simple but very fast ZigZag with no suspended or wrong peaks. The indicator is designed for use in EAs. Peaks retrieval has been time-optimized.

Inspired by Pirat's Expert Advisor submitted to the Automated Trading Championship 2011.

This Expert Advisor illustrates the usage of the IndicatorParameters() function to get the information about the number of input parameters, their type and values.

Corrected Average indicator by A.Uhl (also known as the "Optimal moving average").

A simple script for switching basic timeframes. It allows to change a chart period using hot keys.

Introducing the example of visualization of optimization results in real time (balance curve dynamics and an Expert Advisor statistical parameters).

The Expert Advisor is based on EMA_RSI_VA indicator.

Exponential Moving Average - RSI Volatility-Adjusted by Jose Silva.

Exponential Moving Average - Bollinger Bands ® Volatility Adjusted by Jose Silva.

Advaptive Exponential Moving Average - ATR Volatility Adjusted by Jose Silva.

Adaptive Exponentially Smoothed Moving Average, based on StdDev indicator.

Comparative study of sorting algorithms.

The indicator calculates perfect market entry signals, which can be used for neural network training.

Pearson correlation indicator shows the correlation between symbols.

The indicator shows the size of Highs and Lows and their values over the specified period.

Graphic control for color selection.

This class contains functions for working with colors. It has color conversion and other useful functions.

This is the improved version of Price Channel indicator. Two additional price levels, trade signals and Stop Loss/Take Profit levels were added.


The indicator plots the chart of the specified symbol in a separate window.

Multi-Williams Percent Range trend indicator.

Clouds formed by the masses of moving averages of different periods.

The script adds vertical lines on the chart at the news events.

Classic Pivot Point indicator paints pivot point and three resistance and support levels for all data points.

The indicator calculates the resistance and support lines and shows alerts when price is reached them.

The indicator creates a channel and provides the possibility to configure it with automatic tuning.

The indicator shows the use of the free Library for Custom Chart library for the automatic connection of the indicators to iCustomChart custom charts created on the basis of custom history files.