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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 12

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.


This is a high-quality ZigZag based on HiLo.

Reference Fast Trend Line (RFTL) is a response of the FATL digital filter to the series of input prices with a delay equal to the Nyquist interval of 1/2F.

The modified version of the RBCI indicator.

Perfect Commodity Channel Index. It has a certain similarity in the calculation method with the Commodity Channel Index (CCI) by D. Lambert.

Trend indicator based on the Kaufman's AMA.

The indicator contains another entry signalizer.

One of the greatly smoothing trend indicators.

As I recall, this indicator had been written by OlegVS for МТ3, for determining the flat. If the price is inside the dotted channel - flat. And MaksiGen redesigned it for МТ4.

This indicator shows when to open and when to close by drawing 2 lines.

The "Camarilla Pivots" indicator. The ideal indicator for those who like to work "by levels". It clearly shows the reversal level, support/resistance levels for the current day.

The indicator that facilitates the interpretation of the Ichimoku signals.

The indicator calculates the indices of the USD, EUR, GBP, CHF, AUD, CAD currencies and displays the index specified in the parameters in a separate window.

MACD2 generates bearish signals from three main sources. These signals are a reflection of the bullish signals - negative divergence, bearish intersection of the moving averages, bearish intersection of the center line.

The indicators that perform the chart ruling.

Linear regression is a mathematical method for determining the linear dependence between the variables. This technique is often used by analysts to identify the trend based on the time and price data.

The indicator of dynamic resistance/support level with a fixed channel.

In the case of weighted moving average, the latest data is of more value than more early data. Weighted moving average is calculated by multiplying each one of the closing prices within the considered series, by a certain weight coefficient.

The indicator shows the price points of reference.

Fast adaptive trend line is an estimate of the trend line.

The Jurik Moving Average indicator. JMA's improved timing and smoothness will astound you.

Useful for those who use the DeMark TD lines in trading. It draws TD points, plots TD lines, calculates the current values of TD lines, calculates the targets.

The indicator shows the fractals of different time periods on one chart (with different colors). Only М15, Н1, Н4, D1 are used.

The Hi/Low indicator shows how close the current value of the parameter is to the minimum and maximum values over a certain time interval.

It is not recommended to open a position when the histogram is red. If all indicators give entry signals, the final check is done according to this indicator. The histogram must be green.

Based on the use of a slightly modified Hull Moving Average (HMA).

Set of standard functions for the YR1 timeframe.

The script is designed for downloading history on all known currency pairs, metals, indices, CFD and for controlling "holes" in history.

The indicator draws the slow and fast ССI and colors bars for determining patterns and trends.

The indicator allows the trader to understand market relations.

The indicator displays the number of ticks inside the candlestick.

When the stochastic enters the overbought or oversold area, the first lot is opened, if the chart is reversed, then operate with one lot.

The new version of the Mc_valute_v8_final EA. It works well on a flat market.

The unique FX_FISH indicator is widely used by the Western experts to trade in the foreign exchange market, stock market, and others.

Plotting principle - digital filtering.

(Fast Adaptive Trend Line)– the «fast» adaptive trend line is calculated using a digital low-pass filter with a small cutoff period.

A simple indicator of dynamic support and resistance levels.

The Lines_Create script creates 2 horizontal lines on the chart with the names UP_LEVEL and DOWN_LEVEL. The Lines_Delete deletes the lines created by the Lines_Create script from the chart. The Lines_RASST script is an addition to the Lines_Create script.

This script is designed for obtaining various statistical data on the chart candlesticks on the selected timeframe.

2 scripts for the analysis of trading results. Useful both for investors and traders.

The calculator estimates the value of one point of a currency pair and the maximum stop loss for the user-defined lot.