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Access the CodeBase from your MetaTrader 5 terminal

Couldn't find the right code? Order it in the Freelance section

How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 92

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 Relative Strength Index (RSI) technical indicator is a price-following oscillator that ranges between 0 and 100.

Parabolic SAR Indicator was developed for analyzing the trending markets.

Moving Average of Oscillator is the difference between the oscillator and oscillator smoothing.

The Moving Average Indicator shows the mean instrument price value for a certain period of time.

The Momentum indicator measures the amount that a security’s price has changed over a given time span.

Moving Average Convergence/Divergence (MACD) is the next trend-following dynamic indicator.

Ichimoku Kinko Hyo indicator is predefined to characterize the market trend, Support and Resistance Levels, and to generate signals of buying and selling.

Heiken Ashi - Custom Indicator as Candlesticks Example.

Commodity Channel Index (CCI) indicator measures the deviation of the commodity price from its average statistical price.

Bulls power oscillator (Bulls Power, Bulls) - trend following indicator.

Bears power oscillator (Bears Power, Bears) - trend following indicator.

Bollinger Bands ® Indicator (Bollinger Bands, BB) is plotted a certain number of standard deviations

Awesome Oscillator (AO) is a 34-period simple Moving Average, which is subtracted from the 5-period simple Moving Average.

Average True Range Indicator (ATR) is an indicator that shows volatility of the market.

Alligator indicator is a combination of Balance Lines that use fractal geometry and nonlinear dynamics.

Accumulation/Distribution Indicator is determined by the changes in price and volume.

Acceleration/Deceleration Indicator (AC) measures acceleration and deceleration of the current driving force.

Sample Trading Sistem for cross 2MA & CCI

Stdlib - example of library

Example of file read and write operations

Easy example working with object: object creation, modification properties, redraw chart.

Example: Moving Average indicator filling by different colors

Classical MACD Sample.