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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 3

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 Expert Advisor opens positions after the price passes the specified distance. 1 step up - sells, 1 step down - buys.

The SAW_system_1 Expert Advisor places pending orders on the basis of the volatility for the last N days.

Rapid Application Development library.

The indicator is designed for calculating and displaying the options levels on the screen.

An example of creating a trade panel using the MasterWindows library.

Modification of the standard Awesome Oscillator by Bill Williams. Recommended timeframe - М15.

A library of classes for creating a user-friendly interface of your programs.

After a loss, the EA opens orders with stop levels increased by the coefficient.

Martingale grid EA. The main idea of the EA is not in accurate entries, but in flexible plotting of grids.

Displays important parameters, which can change during news release or on Fridays before closing.

Downloads the history of Alpari PAMM accounts and displays it on the chart.

This indicator plots bullish and bearish gaps, and crosses/hides closed gaps.

Immediately deletes the SL/TP of all positions.

Total closure of all positions (winners/losers). You can also select which are of a single instrument.

Closure of all positions with a loss. (You can indicate a specific instrument if you want to).

Closure of all winning positions. (You can indicate a specific instrument if you want to).

Shows multi timeframe (M1, M5, M15, M30, H1 , H4, D1) RSI indicator in a separate window.

OBz library of trading functions: position size, open, close position etc.

Indicator detects the Inside Bars and marks them high/low (no redraw).

This is a great beginners' example of the function OnChartEvent() & creating objects on the chart to access them for some tasks.

Awesome Oscillator, customizable, 4 colors (as seen on some AIMS YouTube videos), and some more parameters.

This indicator is based on the moving average, but it doesn't use any standard moving average indicators.

Two EA's. One places Stop orders the other places Limit orders.

Renko chart generator using the tick values.

Fast time range checking function. Doesn't use slow string parsing.

The script modifies all orders (market and pending) on the symbol with specified Take Profit and Stop Loss.

Buy or sell just by looking at the "arrow" as a signal. Very easy and simple.

PricePosition indicator provides the position of price in the point of angle when the price rises above (BUY) or falls below the angle section line (SELL).

Calculates profit (loss) of the current orders on the symbol.

Modified version of FF Calendar Indicator with new features.

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.

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