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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 27


This is the largest free source code library for MetaTrader 5 platform programs. Here you can find ready-made Expert Advisors, technical indicators, scripts and libraries. Use the code library when learning MQL5 language and develop your own automated trading applications based on the provided codes.

You can freely download and test published codes, as well as launch them in MetaTrader 5. The library is also available directly from MetaTrader 5 platform and MetaEditor development environment.

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Trend continuation factor - averages pre-smoothed (filtered)

The indicator determines the direction of the bar based not only on the Open/Close prices. Gaps and gaps in quotes are also determined.

Trend trigger factor - with an addition of discontinued signal line(s)

Hull ribbon

Schaff trend cycle CCI

Schaff trend cycle - Hull

Hull quad

This is a re-write of the nonLagMA found elsewhere and includes several uncommonly shown coding options, including a simple control dashboard.

Fractal Adaptive Moving Average with value filter

Fractal Adaptive Moving Average with floating levels

Fractal Adaptive Moving Average -

Super smoother RSI

Easy and visual way to check abnormal changes in Volume.

This is Larray Williams's Variable Accumulation Distribution, used in volume analysis.

TrendStrength EMA variation

TrendStrength of deviation scaled MA

PdfMA based awesome oscillator

Probability density function based MA MACD

Deviation scaled MA with self adjusting levels

EMA variation ribbon

Exponential moving average variation

This is the trading signal of Bollinger Bands. The expert code for this strategy is automatically generated by the MQL 5 wizard.

Momentum ratio oscillator

Highest high & lowest low support resistance

RSI divergence candles

Filtered deviation scaled MA

Deviation scaled MA - extended

CCI of average - floating levels

Higher Highs & Lower Lows Stochastic

Stochastic extended - floating levels

MACD slope divergence

Rsi slope divergence

Two identical trading systems (for long and short positions) based on the signals of the FineTuningMACandle indicator, which can be configured in different ways within one Expert Advisor

The Expert Advisor combines signals from several indicators. It can also follow a certain indicator.

The indicator shows the gap size on the histogram.

XFisher_org_v2_Candle indicator provides alerts, sends email and push notifications at the incoming trading signals. Possible signal options

The Expert Advisor uses iMA (Moving Average, MA), iAO (Awesome Oscillator, AO) and custom Laguerre indicators.

XFisher_org_v2_Candle_Alert indicator with background filling for overbought/oversold areas, as well as for the channel between them

Exp_XFisher_org_v1 Expert Advisor based on XFisher_org_v1 oscillator signals.

Working by iMA (Moving Average, MA) and OHLC of W1 timeframe