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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 15

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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One of the indicators that display the session times.

The idea of this indicator is quite simple: draw lines to remember the current phase of the market and who "rules" the market.

One of the indicators I recommend to novices as the entry indicator.

As it can be seen, the indicator is perfect. Simply buy at the second black bar and sell at the second red bar. And take all the movement literally pip by pip.

Displays the type of candlestick or small pattern in accordance with the general setting.

A more advanced patterns analyzer. In addition, it generates a signal.

The DJ Lines belongs to the Pivot group. All similar indicators operate on the principle - «Based on the values of the previous day (days) it is possible to calculate a point, passing which would mean a change in the trend».

One of the new tendencies in trading is digital indicators.

If you like plotting channels, I recommend plotting them yourself. This is particularly true for the slope channels. However, if you use channels merely as filters or simply like to set alerts on these levels, then the indicator will be useful.

Really useful channel indicator.

In classical literature, the relative strength index is described as the "price-following oscillator that ranges between 0 and 100, and signals the market sentiment to change the trend at high (close to 100%) or low (close to 0%)...

The most common and essential modification of Bollinger bands. Displays the standard deviation in a separate window, without disturbing the trading psychologically.

A modification of the popular ADX indicator.

Kaufman Moving Average.

The 4Period RSI Arrows indicator

Moving average channel based on the Fibo levels

Indicator based on the data of multiple RSI, Bollinger, MAverage. Beautifully displays the areas for buying and selling. Recoups 30-90 points, depending on the currency.

Script for the calculation of the third Elliott wave

Indicates the number of periods for the calculation of the average line.

Through the use of more sophisticated smoothing algorithms this RSI has less delay and smoother shape of the curve.

The FanSimple displays the correctness of reversal of the moving averages fan on different timeframes. The indicator includes four moving averages with the values 5, 21, 55, 233, that are displayed on the chart.

The name of the indicator is left as it was: Plagiat. In the original version it was HMA.mq4 (based on a publication in ForexMagazine #104").

The currency indices indicator with the ability to calculate CCI, RSI, Momentum, MACD and Stochastic.

The CatFX50 is an easy and winning system, but it is not so simple. Be sensible and place stops at the distance of 34 pips.

Shows when to buy and when to sell. Position is opened when the indicator color changes: if there is a green dot - buy, if there is a red dot - sell.

Displays the situation when the directions of price movement and technical indicators do not coincide. This is mostly seen when the indicator reaches an overbought or oversold area (20;80).

The indicator displays the ranges. Useful for the visualization of various "zones".

Simple indicator with great potential for the analysis of data and its use.

Displays the difference between the long-term and short-term market sentiments relative to the price.

A solution for those who can not devote much time to the analysis of the current situation on the Forex market and to making correct and confident decisions, that are an integral part of online trading.

The LSMA is used for confirmation of counter-trend signals.

The Expert Advisor that gains profit from the positive swaps + multi-currency arbitrage tactics.

The Range indicator displays the index of the range expansion and is an oscillator for the market calculation.

Indicators for the "Chaos" trading system described in the third book by Bill Williams (Bill Williams and Justin Williams. Trading Chaos - Second Edition).

The ZZ_All Quotings 0-0050 script is designed for downloading history on all currency pairs, metals, known indices, CFD and for controlling "holes" in history.

A simple function that creates a list of the available currency pair symbols.

Function library and Experts for trailing (11 types). Simple usage of complex algorithms.

The Dealers Trade v 7.74 EA is based on the algorithm of multi-lot scalping. The EA has been repeatedly tested on a live account.

The Dealers Trade v 7.51 RIVOT EA is based on the algorithm of multi-lot scalping. The EA has been repeatedly tested on a live account.

The indicator shows direction of movement and rollbacks.

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