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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4

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.


Set all opened charts to use auto scaling or fixed scaling simultaneously.

Library for defining schedules by weekday and time.

Tipu CCI is one of the popular indicators in the Market. The original code for Tipu CCI is modified by removing compatibility with Tipu Panel. This version of Tipu CCI is open for everyone who is interested in developing an Expert Advisor.

A low latency container for working with ticks

The script downloads the historical quote data of the current chart symbol and timeframe.

Many developers need these functions, while working with different kinds of external APIs, like Bitcoin and altcoin exchanges where it is often necessary to send data with the confirmation of parameters validity through HMAC-SHA512, HMAC-SHA384 and HMAC-SHA256.

A martingale strategy, an old EA that was rebuilt to be efficient.

Calculate the average volume per hour in a 1 hour chart.

EA is run say once every minute and writes the status of IsConnected, spread, stop and freeze level to a file.

This Martingale EA trades with one moving average, it is considered relatively safe because it takes a single trade at a time.

Calculate Pivot Points based on H1 bar, according to normal formula and Fibonacci, with color filling.

This indicator is based on original RSI, but more features are added to general signals and watch the strength of the price movement. The main purpose is to general buy/sell signals using smoothed RSI and its MA.

This is my version of Zone Recovery Hedging Strategy Ea with two moving averages. It works on any time frame, you should try it on demo account.

Script to start an external program.

Close all positions on a basket of currencies when the profit target has been reached.

MT4 Expert Advisor based on ADX indicator.

A fast library for combinations and permutations in MQL4.

Expert Advisor which trades signals from MACD indicator.

The indicator is based on the idea that before the price and the indicator itself turn, the indicator rate slows down first and only then turns.

This is the semaphore indicator with arrows based on BB and RSI.

This is a not big assistant for trading with limit orders.

This script provides quick work with a large number of pending orders in the market and contains functions for placing, changing, and deleting of orders within the your price range.

This is the semaphore indicator of candles that highlights the candles on the chart, which have same direction like all candles for your chosen timeframes.

Can be used for hedging or trading breakout systems.

Simple program using the moving average as bias and providing many trade and money management options.

The script allows you to try regular expressions in MetaTrader 4.

After back testing, we usually need to analyze the testing result on a new chart which we have loaded our template,in this case we need to copy the objects on the testing chart to the new chart. This script helps to save the objects into a file and show the objects on a new chart.

The script downloads history for all timeframes and symbols in the Market Watch.

This is an Expert Advisor (+ indicator) for downloading the quote history of the current symbol and TF

Displays the relative strengths of chosen currencies on one chart.

Get entry signals from specific candles based on your rules.

Displays a Histogram of Momentum, ATR, CCI or RSI indicators relative to a specified level.

This script is used to convert history data from M1 to M5, M15, M30, H1, H3, D1, W1, MN.

Generates a random number, and if this number is even, it will buy, if odd - it will sell.

RSI modified to show the excess of the market (more than 70 and less than 30), and show you the divergency with the price.

Simple one click trade panel, typically useful for scalpers and day traders.

Center of Gravity Modification 2018.

Indicator displays the value of defined stop loss and or take profit in the deposit currency.

CEquityHstBar - library for showing the equity of EA back-testing by the offline chart.

This robot optimizes the values it uses for overbought and oversold based on what would have been profitable during the Optimization periods(bars) back. Using the strategy of selling when the index indicator crosses below overbought and buying when the index indicator crosses above oversold.