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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 6

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.


KNJ ZigZag with value at pivots (highs/lows).

It is a recovery system implemented in EA. But you can copy it to any other EAs.

Auto trading with the help of some indicators.

This EA will detect the buffers values of any indicator you want. Just type its name in the EA settings.

Indicator that shows candle strength.

Indicator that shows higher timeframe candle on current timeframe.

This is a graphical indicator based on slope-direction-trend indicator that has been published under several other forms.

This is a conversion factor. It is used to detect whether broker is 4 or 5 digits. As MetaTrader 4 calculates everything using point basis, coder can use this function to convert pips to point for machine reading.

Show full information: price, symbol, timeframe, date, time, spread, swap, stop out level, your name...

The RSI indicator has the ability to display a single window of RSI values of another timeframe defined by the user.

Trading Volume indicator shows the volume of buying and selling trades on the current bar or on average of specific number of last bars as you want . Both volumes are shown simultaneously with green and red colors for buying and selling trading volumes respectively.

This indicator helps to determine swing point highs and swing point lows.

Here I propose a simple password verification scheme which uses MT4's built-in security engine providing DES/ECB encryption and does not require code re-compilation for each new customer.

Tipu Renko Live is a modified version of Renko Charts that can be plotted on a normal time frame.

Simple indicator which displays High and Low 3 days ago.

StochPosition is an indicator for MetaTrader 4 based on Stochastic Indicator, which shows the position and direction of Stochastic in M5 timeframe up to W1 timeframe.

As I'm currently developing an Expert Advisor for Crude Oil and Brent, I wanted to get from the exact date and time of the 'Crude Oil Inventory' report. This report is typically issued on Wednesday's at 10:30am Eastern but when there's a holiday, the release date can change. As this is an important report for my EA, the only way was to check an online service to validate the release date.

In the futures markets data on trade volumes a reported with a one day delay. To compensate for this, many analysts use the tick volume indicator (tick volume).

The Universal_1.64 EA. It has a lot of settings.

Parabolic SAR Indicator was developed for analyzing the trending markets.

The Ang Autoch HL.v1 indicator. Draws a channel.

The indicator colors rising and falling candlesticks.

The XOdiagram 1 indicator. It plots the Х0 charts by close prices.

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

Opens a BUY position with the size of a percentage of the maximum allowed size.

Automatic Trailing Stop for all open positions. Attach to one chart only.

The script opens a SELL position with the size of a percentage of the maximum allowed size.

The ADXdon indicator. Another version of the ADX indicator, which shows the strength of the trend.

The indicator shows the gaps between the closing price of the previous bar and the opening price of the current bar.

Lot sizing library. 29 money management options.

A set of functions to emulate the dynamic arrays.

Example of working with objects: creating object, changing properties, redrawing the chart.

Indicator 5_34_5

I am not a programmer, so I apologize for mistakes. This is my first EA, please rate it. And also its reliability.

Simple EA, but such efficiency for the year 2007!

Expert Advisor from the ATC-2007. Buys/sells when the price crosses the line of a moving average with the period (590)

The FarhadCrab1 EA. It has a lot of settings. It also uses a large number of indicators. Some of them: MA, Stochastic, Macd, RSI.

A modified version of the FlatTrend indicator, shows the beginning and the end of a flat.

The Farhad EA. It has a lot of settings. It also uses the indicators: MACD, Stochastic, SAR, Momentum, MA.

Expert Advisor based on two indicators (ADX and Momentum) with a built-in optimizer. Based on the optimization results it selects the best period for indicators and the trading direction or refrains from trading.