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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 8


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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Simple EA on 'iVIDyA' indicator

Indicator based on iAO (signal 'saucer') and filter based on iMA

Service Script for aggregating Economic Calendar data to a .txt file

Trading strategy for the custom indicator 'OsMA Four Colors Arrow EA'

Three candles from another timeframe are drawn using graphical objects

Smoothing the custom indicator 'Relative Momentum Index' using iMA

Two indicator series ('Two MA Color N Bars' and 'Square') in one code

Displays direction of volatility and volume

Martingale based on custom indicator 'VIDYA N Bars Borders'

The indicator plots (using OBJ_TRIANGLE) the area between 'Open', 'High', 'Low' and 'Close' of the day

A simple indicator that tries to assess autocorrelation in price series.

A series of indicators 'Square' - shows the state of the indicators in the form of lines of squares. Displays two indicators: MACD and Stochactic

Finalization of previous version. Now, when opening a 'SELL' position, we immediately close all 'BUY' positions and vice versa: when opening a 'BUY' position, we immediately close all 'SELL' positions

Trading strategy based on the iAMA (Adaptive Moving Average, AMA) and iRSI (Relative Strength Index, RSI) indicator. Doubling the position at a loss (not Martingale!)

Just a very simple expert that execute orders from a text file.

iVIDYA (Variable Index Dynamic Average) indicator with levels for N bars

The script (not an Expert Advisor) sets and moves the Stop Loss for all positions on the current symbol to the specified price

The indicator displays the 'Ask' line -> a spread is added to the 'Close' price

Two 'Main' lines from two iStochastic (Stochastic Oscillator, STO) indicators with filled areas between the lines. Line crossing notifications (Sound, Alert, mail, push)

Strategy based on custom indicator 'RSI Dual Cloud'. Four types of signals

Two RSI (Relative Strength Index, RSI) lines - 'Fast' and 'Slow'. Filling areas from the window borders to these lines

Shows your position size through a comment from any symbol chart based on a risk percent on daily ATR, you can use either balance or equity.

Cumulative candle, taking into account High and Low

Channel of 'N' bars at 'Low' and 'High' prices

Trend indicator. Added alerts (Sound, Alert, email, push)

Development of the first version. Added parameters 'Maximum number of positions' and 'Minimum step of positions'

The indicator shows the zones between the price crossing and the "MA" indicator

Histogram between price and indicator or between two indicators

Strategy based on the 'DeMarker' indicator, working with pending orders

The indicator shows the position of two indicators (iMA and iStochastic)

Version 2: extended functionality (added a few extra options)

A simple indicator plotting a channel with a constant range

Assistant - works on the current symbol, has the 'Trailing activate if profit is >=' parameter in the trailing parameters. Sets the initial Stop Loss and Take Profit. Closes all positions when target profit is reached

Assistant - works on the current symbol, has the 'Trailing activate if profit is >=' parameter in the trailing parameters

In a given time interval, a rectangle is constructed.

Советник-утилита. Показывает суммарную прибыль за несколько периодов (сумму и в %), количество сделок за несколько периодов. Расчёт по заданному символу и magic number

Fractals based on the iOBV indicator (On Balance Volume, OBV)

Martingale strategy based on custom indicator 'MACD Four Colors 2'

Colored Stochastic smoothed with iMA (Moving Average, MA)

Very simple indicator to plot the values of the spread[] data as reported by the OnCalculate event handler.