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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 135

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 indicator is a modification of classical Awesome indicator. It computes the smoothed rate of change of two exponential means.

This indicator is a small modification of classical Fractals Indicator. You can choose the number or left/right bars to have a new top or bottom as well a shift parameter.

EasyXML is a native MQL5 XML Parsing Library. It can parse XML from three different sources: URL, File and String Input. It is completely object oriented and strives to integrate neatly with MQL5, as it utilizes CObject and CArrayObj from the MQL5 standard library to store the DOM.

The code is designed to be a simple reference of how to create movable (drag) panels and populate it with information.

An indicator of trend power with eight states.

Spread Indicator - displays current spread in the chart window.

A set of support and resistance levels with five different timeframes.

A moving average indicator obtained by averaging the values of all calculation variants of the classical Moving Average.

An analogue of the Alligator indicator with a smaller lag of signals.

The KAGI chart in the simplest form.

A standard high-frequency filter.

The EMA_Prediction_HTF_Signal indicator shows trend direction based on the data of the EMA_Prediction indicator as a graphical object with colored trend indication, gives alerts or audio signals and sends push notifications on your smartphone.

The indicator draws fractals based on three candlesticks.

Coloring price chart bars depending on the size of price change.

Three main stochastic lines from three different timeframes on one chart.

The linear regression line with data placed in the indicator buffer.

A digital filter of rapid trend with a reference line, implemented in the form of a cloud.

A set of target support/resistance levels for the predicted price movement.

The Moving Average Expert Advisor trades when the price crosses the MA.

Three Moving Averages with three different timeframes on one chart.

Ergodic MACD-Oscillator implemented in the form of a color histogram.

A trading system that uses the Candle Momentum indicator.

A trading system that uses the Candle Momentum Index.

William Blau's Directional Trend Index in the form of a colored histogram.

The Candle Stochastic Index indicator implemented in the form of a color histogram.

A candlestick momentum with a triple EMA averaging.

The ergodic CMI Oscillator as a color histogram.

A normalized oscillator of two curves, similar to the Aroon indicator.

One of the indicators of tick volume with multiple EMAs by William Blau.

Three smooth fast digital filters JFATL with three different timeframes displayed on the same chart.

An indicator that uses tick volume for calculations.

Three Bollinger Bands with different timeframes with the same parameters on one chart.

Three RSI oscillators with three different timeframes on one chart.

A semaphore signal indicator forming signals when price gaps appear.

The indicator analyzes the latest three bars on the basis of a quadratic function and is displayed as a histogram with two signal lines with different periods.

A semaphore signal indicator. Its signals are calculated similarly to the Fast2 indicator. The difference is that trade signals are shown on the chart as corresponding arrows.

The indicator displays DiNapoli levels on the current chart using alerts.

The indicator draws trend support and resistance lines.

A semaphore arrow indicator using two moving averages.

The MDAC indicator with bar coloring according to Elder.