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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 34


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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The main idea of this Expert Advisor is to trade by the basic concept of Stochastic oscillator in its basic parameters, with ability to change these parameters via the EA inputs.

Spread, its moving average (EMA), its maximum and minimum, and ticks per second (market speed) in the Comment. The version 1.01 is made with the normal average, instead of the moving average.

1 Click "Close All" button to close all your positions (regardless of the pair) will be closed at once.

This is my 1st published code, it is very simple code example: RSI 14 (price close) — open buy when it is < 25, close buy when it is > 50, open sell when it is > 75, close sell when it is < 50.

The indicator for the floating spread. Displays the change in spread of multiple currency pairs.

The multitimeframe version of the ChannelsFIBO indicator.

The indicator marks the bars, the size of which exceeds the value specified in the settings.

The arrow indicator that displays the potential market entry points based on the simultaneous presence of three Stochastic indicators with different periods in the overbought/oversold areas.

The indicator plots a channel based on fractals.

The Fibonacci channel display, the axis of which is the moving average line.

The library is intended to implement the font list in the input parameters. The library contains 208 fonts.

The indicator displays a channel based on the moving averages.

The EA searches the last upper and lower fractals and opens positions when the price exceeds these levels.

Display of the Heiken Ashi candlestick indicator in a subwindow.

One of the implementation variants of the Quantum trading system.

The EA opens trades at the intersection of the fast and the slow MAs. It has the function of outstaying the losses.

The EA closes orders when certain loss is reached by them in the account currency. It is possible to vary the loss by the volume of the order.

Script for opening opposite stop orders at a specified time. Once one of them triggers, the other one is deleted.

The RSI with dynamic levels.

The indicator showing the supply and demand zones.

Example of creating info panels.

Trading robot based on the theorem "On the presence of memory (aftereffects) in random sequences".

The script is designed to place orders at the time when it is not possible, for example, when the market is closed.

A simple Expert Advisor, which works without the use of any indicators. Enters at trend reversal attempt.

Display of a symbol's chart in a subwindow of another symbol.

Triple Exponential Moving Average with customizable parameters.

The channel indicator plots a linear regression channel.

The Super Trend indicator not only determines the trend direction, but also helps to detect the Elliott waves.

The indicator displays the equity and balance charts.

Reveals distance from the actual price up to the breakthrough of recently set support or resistance levels.

The script determines the price at the point of the chart, on which it was dropped down, and depending on that it places a grid of orders.

The indicator shows the length of the trend line in points.

Plays sound alerts when the price reaches certain levels, specified by trader.


The Heiken Ashi Naive Expert Advisor is based on the Heiken Ashi candle chart system and uses the standard indicator of the same name.

Shows the current gain and loss for the candlesticks on the chart.

A simple visualizer of trends.

The indicator shows current trend direction by placing colored dots on the main chart.


The indicator detects and marks the WRB (Wide Range Bars) or candlesticks with Wide Range Bodies.

The indicator of divergences on 30 oscillators of choice.

The Expert Advisor is based on the exponential moving averages of the same period.