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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 41


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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This indicator shows when to open positon.

NineTFMovement indicator gives an overview of the price movement on 9 timeframes (M1 to Monthly).

ATR Levels indicator marks 5pm NY on the chart along with the 14 day ATR value.

The script deletes all objects on all active charts.

A simple script to close multiple market orders.

The indicator draws two indicators in separate window.

This EA automatically sets preconfigured Stop Loss and Take Profit value on all orders with empty TP & SL.

MA-Based Price Candle.

Clear All StopLoss n TakeProfit on All Orders.

This EA makes it possible to trade semi-automatically using manually pre-defined support/resistance or breakout levels.

Trend following system with breakout of different EMA as entry signal and SL and a breakout of highest high and lowest low as TP.

This indicator draws a horizontal line at the Average/Breakeven Price for multiple positions.

RSI average commodity for gold and silver.

The Expert Advisor shows information about the current spread.

The Expert Advisor makes random buy/sell with automatic Trailing Stop.

The indicator draws horizontal lines corresponding to daily, weekly, monthly highs/lows and connects them consistently trendlines.

The indicator marks the current chart with red/blue arrows to signal a possibility for buy/sell.

The SmartAssTrade-V2 Forex Expert Advisor is a new update for SmartAssTrade EA Version 1.

The script gets all the symbols available on your platform and writes their closing prices for a specific bar to a csv file.

This indicator gathers indicator data and prints them in the csv file.

AutoTStop EA does not work to open the orders, but only helps trader to use Trailing Stop.

Expert Advisor that moves Stop Loss according to Fibonacci retracements or expansions.

The idea is to work with a trigger, based on ADX, CCI, RVI, WPR and EMA.

Easy to use ticks recorder.

Helps trader by setting automatic Stop Loss (SL) and Take Profit (TP) on trades while scalping.

Classic Donchian-channel with Fibonacci retracement levels.

Draws either MACD, Stochastic, RSI or CCI of 3 timeframes in a separate window.

This indicator will show trend, based on EMA200 of the higher timeframe.

This is simple copy of STUFIC PRO strategy which you can follow as signal or buy at the market.

This script automatically closes all open orders within few seconds.

Pivot points - Midpoints, H4, Daily, Weekly, Monthly.

The indicator is a combination of MA channels and Bollinger Bands.

The indicator displays Market Sessions.

This strategy uses hedging if trend changes.

The indicator computes the volume-adjusted flow of a currency considering all currency pairs available on your platform.

A tool to better visualize price action using a higher timeframe.

The header file contains functions for searching last and previous order in the trade pool.

The simple class for counting of the orders with different filters: by symbol of currency, Magic Number, either closed, either opened orders.

Expert Advisor work with one hour chart, and is the best robot for now, plays a sound when orders/alarms are executed and multiply positions by 10 when 5 digits is true, trailing stops every tick regardless of Execution Mode.

Fractal volatility indicator based on Bollerslev Model.