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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 23


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.

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Simply displays ticks on the price chart

Expert Advisor based on the Sidus indicator.

Visualizer indicator (what a terrible phrase to use!). Colors the chart bars according to the logic of determining the state of the fourth dimension of the Chaos Theory by B. Williams - Zone.

Modernization of the first version of the script with the ability to manage multiple indicators

The script allows to preview the indicator behavior on a real chart from the specified point with the minimum computation resources.

The indicator plots channels on three different timeframes (by default 1 hour, 4 hours, 1 day) and displays them on one chart. Also, for greater clarity, it displays the boundaries of each channel on the chart.

Expert Advisor for trend trading with lot increase

Semaphore indicator that predicts the future direction of the price

It responds to market faster than the MA (moving average)

The ZeroLag MACD Colored indicator is a modification of the ZeroLag MACD. Added coloring of the histogram bars relative to the previous bar, if the previous bar is below/above the current.

Trailing stop by balance

When assigned to a hotkey, the script allows to almost instantly open limit orders with the specified risk level (in the deposit currency) and take profit (so-called braces).

Rebound pipsing within a daily channel

Trading signals function. Based on the values of the CCI indicator.

Aggressiveness - the rate of price change. Volatility - the size of the channel

Calculation of the number of lots by Anton Trefolev.

Determination of the entry levels

Errors function. In Russian.

Based on the values of the OsMA indicator.

Parabolic plotted based on Lows and Highs of a moving average. Efficiently displays the trends on smaller timeframes, and allows to mostly eliminate frequent switches, inherent to the "Parabolic SAR" indicator.

Alternative grid

works on the movement continuation with position inversion after closure

Modification of the DeMarker indicator with additional color indication based on the histogram

Moving average

It can be used as a standalone EA or as a method of recovery from losses

Popularly demanded modification of the RSI indicator

Oscillator based on turnovers

The script visualizes the deals on the chart in a convenient way.

Variation of the DeMarker indicator

Excellent trailing expert. I have been using it for a long time - I recommend it!

The indicator is similar to 4Hour Vegas Model.

Another variation of the fractals.

Multi-timeframe PCCI indicator.

Another variation of the Macd. I do not remember it had already been published.

The indicator predicts (at least tries to) the RSI on a specified number of bars using the cluster analysis

Example of plotting a function spectrum using the FFT library

The MACD is not required to be present on the chart. However, if a standard MACD is attached, the divergence lines will be drawn both on the chart and in the indicator window, and the indicator will use the MACD settings.

Really helps in trading

Attempt to more or less fully automate the opening of Buy and Sell orders

Simple Expert Advisor that simultaneously opens two positions in different directions, provided that the stop loss of the losing position triggers 5 points earlier than the take profit of the profitable one.