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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4

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.


Continuously records tick data in format "DateTime, Bid, Ask, Volume" even after restart.

This script is used to calculate lot rebate.

This indicator provides an easy way to find out the current direction of a pair.

This EA uses different indicators: ADX, Stochatisc, Accelerator... This EA is optimized for USDJPY TF H4, but it can work on others if you optimize it.

Simple way to encode and decode using Base64.

A good oscillator for helping you count Elliot waves.

Shows simple channels for daily, weekly, monthly timeframes.

The EA is based on 5 MAs: 10-, 20-, 50-, 100-, 200- period and + ADX (the main line)

ATR MA Oscillator - Oscillator is based on the difference between the ATR oscillator and its signal line.

The script plots a "Tic Tac Toe" chart in the form of Japanese candlesticks.

Expansion and improvement of the script ver.2 and an example of accelerated processing of an indicator for use in conjunction with the script

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.