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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 72

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.

Submit your code

An expanded version of the Normalized Volume indicator. Added means facilitating visual analysis of the indicator's values.

The indicator is build on the basis of moving averages. Its main feature is entering/leaving signal - the indicator's line is colored in a certain color signaling for the user to buy or to sell. The accuracy of the signal is very high.

Demo it First... $5000 Flipped To $243K in 3 Months. Coders Needed, Not Finished.

Trading on news.

Indicator Otcfx_b-clock modified V3.2. Another version of the recommended indicator.

Reversal indicator. It represents 3 lines of different colors showing the trend speed on the current, the nearest larger and the next larger timeframe (TF).

Another version of popular ZigZag.

An original indicator that shows buying/selling signals.

A standard indicator Fractals, that doesn't redraw the lasr fractal....

The pattern of the MACD trend continuation

TS on the break through of daily resistance/support levels of the Pivot indicator.

The standard linear regression channel and support/resistance levels.

Indicator Price and Volume Trend (PVT), like On Balance Volume (OBV), represents the cumulative sum of trade volumes calculated considering close price changes.

A 4-hour MACD FOREX strategy

Previously uploaded Expert Advisor Kloss specially revised for optimization

A set of function tools.

The indicator shows the trend. A code example for candlesticks colored in four different colors according to the trend strength.

Unloading quotes from the selected period into an external file.

Drawing all results from a strategy tester report file into a chart.

The indicator displays signals to buy/sell.

Indicator that predicts possible reversal points.

The indicator colors candlesticks.

The indicator colors bars.

A primitive Expert Advisor that learns from its own mistakes.

The Expert Advisor demonstrates the possibility to gain profits using the position opening strategy based on the "heads-or-tails" principle.

Indicator Tro_Range.

Very simple indicator PLdot. It's been even optimized.

A simple system without indicators.

Indicator of the normalized volume

Combo of averages and MACD. All parameters are free to be changed.

A step-by-step passing of historical data for manual testing of trading.

Script interception of pressing keys or mouse buttons in the windows of MetaTrader 4. It can be helpful in writing controls.

Report generator

CustomCandle draws candlesticks of a larger and, perhaps, non-standard (for MT 4) timeframe in the current chart.

Market Profile is a tool used by many Futures traders.

Another version of a recommended indicator.

Indicator BreakOut_Panca_eagle.

3 bearish and sequential lengthening bars? Bruins, we are not going your way!

An EA developed on the basis of "Full Dump" system.

A DLL to manage and exchange data between MT4 and MS Excel. OLE is used. The description of the DLL functions is given in the attached example. The example is a script that sends quotes to Excel and builds the diagram of daily price changes. At exiting,