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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 81


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 indicator displays helpful information for the trader.

It draws a channel with recommendations.

Indicators Parabolic SAR and Exponential Moving Average are used in the system.

Indicator Impulse CD (Color) is a sequel of impulse approach. By users' requests, colors and signal line are added.

A toy script that demonstrate the way of displaying some text information in a chart.

The script draws a set of up/down levels that are at a certain-percentage distance from the price of the bar selected by user.

A script aimed at loading of history for all available currency pairs, metals, indexes, CFD, and at checking of history for "holes".

The script places stop orders. The orders are placed for the market/pending orders specified in custom variables High (variable Hi) and Low (variable Lo).

System OzFx to gain the profit of 100-800+ pips.

The system is based on volatility compression.

Three scripts for quick preparation and manual placing of trade orders.

A multi-currency Expert Advisors aimed at trading on Asian sessions.

An EA that increases the order volume after each losing trade.

An example of using graphical object OBJ_LABEL for tabular display.

A code/method to test the redrawing indicators, by the example of FxmFish

High-Probability Breakout EA with very favorable risk:reward ratio.

The strategy underlying this EA is based on the indicator of MA.

This automated trading system is intended for working with the currency pair of eur/usd in the one-hour chart. Excellent results.

The EA is based on the indicator TREND_alexcud Something goes wrong with it

Indicator RoundLevels draws two "round" nearest levels above and below the current price level. Short English comments are in the MQ4 file.

I modified the original MACD. This resulted in such an interesting indicator.

Indicator StochCandles. Paints candles on the basis of stochastic.

Indicator Stoch Crossing is a modification of EMA-Crossover_Signal based on Stochastic Oscillator.

Indicator Traders Dynamic Index, helps traders to supervise the market.

Indicator MTF_4TF_Supertrend_BarM. Works together with SuperTrend and uses signals CCI.

Percentage Price Oscillator displays more precise signals of divergences between prices and the value of the oscillator. It also emphasizes price extremums more precisely, it moves faster.

Indicator ToR_1.20. The indicator shows development of a currency pair.

Indicator MTF Stochastic Standard. Shows 4 stochastic on one.

One more version of indicator ChandelierStops. Works together with indicator ChandelierStops_v1.

A modified parabolic. It readjusts the entering/leaving points according to the situation on the market.

Indicator Hull_O_H_L_C.

Indicator OnChart Stochastic.

All data of this indicator is contained in the coordinates and names of graphical objects. Trade alerts are extracted from the graphical objects generated by the indicator.

Indicator SAR Color.

Indiactor IFish.

Indicator KaufWMAcross. Works with indicator Kaufma.

Indicator TZ-Pivot. Gives the recommendation on a time interval. See in a code.

A multi-timeframe indicator. It shows the trend direction for the charts of several timeframes in a separate window.

Modified Heiken Ashi

Modified indicator AvgRangeM.