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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 97

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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 Indicator ZeroLag MACD is an indicator Moving Average Convergence/Divergence, MACD with zero delay.

The Expert Adviser 10 points 3 uses the histogram of the standard indicator Moving Average Convergence/Divergence, MACD.

Point & Figure Charts (P&F) differ from normal price charts through that they fully ignore the time values and only show changes in prices.

Being one of indicators of group NRTR (Nick Rypock Trailing Reverse), the NRTR WATR indicator is a dynamic price channel adapted by volatility.

Indicator SHI_Channel_true shows Barishpolts' dynamic moving channels in the chart in automated mode.

Indicator SilverTrend rewritten by CrazyChart is an alerting system similar to indicators of ASCTrend.

WPRslow is an indicator based on Larry Williams' oscillator %R, or WPR (Williams’ Percent Range). It shows a long-term market tone.

WPRfast is an indicator based on Larry Williams' oscillator %R, or WPR (Williams’ Percent Range). It shows a short-term market tone.

Indicator PerkyAsctrend1, as well as all other ASCTrend indicators is based on Laryy williams' oscillator %R, or WPR (Williams’ Percent Range).

The Market Profile uses alternative presentation of information about both horizontal and vertical market moves.

Three Line Break - a raw of vertical rectangle, the height of which is determined by the value of price changes.

The Renko charting method is thought to have acquired its name from "renga" which is the Japanese word for bricks.

The Kagi Charts illustrate how demand-and-supply forces act.

Quickly close open orders by dragging and dropping this expert on chart. Will ask for confirmation to close each order within 2 pips of the drop.

The Expert Adviser JK_BullP_AutoTrader is built on Bulls Power indicator.

The Expert Advisor Stoch works with SellLimit and BuyLimit pending orders.

The Expert Advisor MACD_signal is founded on signals of Average Directional Movement Index (ADX) and Moving Average Convergence/Divergence (MACD) indicators.

The Expert Adviser MARE5.1 is much simple and uses values of Simple Moving Average (SMA) on Close Price of 0, 2 and 5 bars.

The Expert Advisor TDSGlobal uses the indicators MACD, OsMA and WPR.

Expert Advisors MySystem using indicators BullsPower and BearsPower.

Expert shows how Backtest results are unreliable when you open and close an order on the same bar.

Trix Indicator - oscillator based on a triple smoothed EMA.

Drive is a comparision between total up & down movement of each bar. Identifies Trend.

Zerolagstochs Indicator.

Support and Resistance Indicator.

CoeffofLine Indicator.

RobotPowerM5_meta4V12 Expert Advisors.

ROC

ROC Indicator.

Multi_Lot_Scalper Expert Advisors.

BB_MACD Indicator.

ATR ratio Indicator.

ATR Channels Indicator.

ADXcrosses Indicator.

Smoothed ADX BARS Indicator.

wlxFractals Indicator.

wlxBWWiseMan Indicator.

NRTR_ATR_STOP Indicator.

AMA STL Indicator.

TSI_MACD Indicator.

FX Sniper's T3 CCI Indicator.

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