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How to Write an Expert Advisor or an Indicator

MQL4 and MQL5 Source Code Library


You don't know where to start learning the MQL5 or MQL4 programming language? Various programs for your MetaTrader terminal are available here. Download and study published code examples, develop your own indicators and Expert Advisors. Publish your applications in the largest library of MQL5 and MQL4 codes, and they will be available in every MetaTrader terminal and MetaEditor.

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The Expert Advisor is a joke: the position is opened randomly. Now there is a Stop Loss, Take Profit and much more

Expert is a joke! The position is opened at random!

A series of indicators 'Four Colors'. Signals are now 'Arrow' in the main window

An exponential moving average of the true range and the offset of its average deviation

Added alerts to custom indicator

Candlestick chart without shadows

A simple trading system using the custom indicator "WPR Custom Cloud"

Added alerts to custom indicator

Colored SAR indicator. Alerts on color change

The indicator draws three daily rectangles

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)