Top MQL4 and MQL5 source codes based on user ratings - 213

AttachExpert.mqh attaches an Expert Advisor to a chart from MQL5 code, with the inputs you choose and with "Allow Algo Trading" on or off.

Script that reports what an EA has to cope with here: hedging or netting, trade permissions, filling modes, stop and freeze levels, volume rules, swaps and the positions already open on the symbol. Saves a report file you can attach to a Freelance order.

Gaussian hidden Markov model fitted by Baum-Welch: regime probabilities without look-ahead, most likely path, expected durations and regime forecasts.

Kalman filter and smoother with an exact diffuse start, missing values and maximum likelihood: local level, local linear trend and a regression whose hedge ratio drifts.

Position manager for MT5 that closes the best winner together with the worst loser when their combined result reaches your minimum. Basket take profit and stop loss in money, magic filter, simple panel. Works with grid, martingale and manual trades. Open source code.

Partial close expert advisor for MetaTrader 5: closes a percent of the position at TP1, TP2, TP3, TP4 and TP5, moves the stop loss to breakeven and trails it. Works on manual trades and on positions of any EA, on any symbol, Gold (XAUUSD) included. Open source code.

Draws Asia, London and New York session boxes on the chart with each session's high and low.

Fits five bivariate copulas on ranks, with Kendall's tau, tail dependence, the probability of joint extreme days, AIC and the conditional probabilities of pairs trading.

A one-file library that handles how an EA trades: pre-trade checks, normalisation to broker limits, safe retries, one order per signal, isolation by magic number and state recovery after a restart. Lot by risk, daily loss limit and equity floor included. Verified in the Strategy Tester.

A regime-classification oscillator that measures how far, and how persistently, price deviates from a rolling volume-weighted VWAP in standard-deviation units, separating trending conditions from ranging ones.

Close all positions panel for MT5: seven buttons to close all, buys, sells, winners, losers, the chart symbol or delete pending orders, on Gold (XAUUSD), forex or any symbol, for manual trades and any EA. Open source code.

A stop distance in points is not money until the tick size and tick value make it one. This library turns four risk bases into a lot size, floors it to the volume step, caps it against free margin and tracks a daily loss limit. Two MQL5 headers, no DLL.

Draws the high and low of a chosen time window and alerts on the first break on each side. The levels are also available through iCustom.

Draws the daily opening range and its breakout levels, with a dashboard showing how the range resolved over your lookback: broken up, down, both ways or not at all, and how often a breakout hit its target before the opposite side.

Auto Fibonacci retracement for Gold (XAUUSD), forex and any symbol: draws the levels on the last completed swing leg by itself, with the 61.8 in its own colour, prices on each level and an optional alert. Open source code.