Top MQL4 and MQL5 source codes based on user ratings - 209

Four EAs writing to the same file, all with FILE_SHARE_READ|FILE_SHARE_WRITE, FileSeek(SEEK_END), FileWrite, FileClose. Looks correct. Every FileOpen returns success. No error in the log. And the lines vanish. Reason: FILE_SHARE_WRITE lets all four open at the same time. All four call FileSeek(SEEK_END) and get THE SAME offset, because none has written yet. All four write at the same position. Whoever closes last wins. Three lines vanish silently. In my case: 12 events expected, 8 in the file. The fix is to open EXCLUSIVELY (no FILE_SHARE_WRITE) and retry while another EA holds the file. And to shout in the log when the retries run out: a log that fails silently is worse than no log at all, because you trust it. The demo script reproduces both modes. To see the loss, drag it onto four charts at the same time with safe mode off and count the lines in the CSV. On a single chart the defect does not show up - which is why it passes in testing and breaks in production.

Three position-sizing protections that do different things; confusing them is why so many accounts get wiped out: - ladder: one contract per X of balance, always applied as a CAP, even with manual lot sizing; - floor: below the minimum capital it does not trade; a new deposit is needed; - breaker: stops at X% below the peak, at any account size, and does not rearm by itself. What this library solves and almost none does: a deposit is not profit, and a withdrawal is not a loss. The breaker measures the drop against the balance peak. Untreated, a deposit made DURING a drawdown lifts balance and peak together, and the protection stops seeing the drop exactly when it would help. Here deposits and withdrawals shift the peak by the same amount. The peak is persisted to a file: a breaker that forgets the peak on a terminal restart is not a breaker. The demo simulates a deposit at the bottom of a drawdown. Run it with the deposit on and off and compare the "drop" column.

Drag your stop loss where you actually want it, hit Buy or Sell, and the lot size is already correct — no calculator, no spreadsheet. Handles break-even, trailing, and shuts trading down for the day if you hit your loss limit.

EMA(10) x EMA(30) scalper for XAUUSD on the M15 timeframe with a Jakarta session filter. Educational example: fixed lot size, SL/TP in points, maximum of 1 position, spread filter. Tested on 100% real ticks.

AurumNeuro Vanguard is an intelligent Expert Advisor (EA) specifically designed for XAUUSD / Gold trading, combining a hybrid Neural Risk Architecture with the Unified Market Dynamics Engine (UMDE).

MQL5 port of a Pine Script ATR trailing-stop indicator: nLoss = ATR-multiple, the stop ratchets under price in an uptrend and over price in a downtrend, and flips (with a buy/sell arrow) when price closes through it. Includes a Python reference port and a parity test that checks both agree with a literal, bar-by-bar transcription of the Pine semantics (na/nz/series history).

Exports bars to a CSV file that pandas.read_csv() loads without encoding, separator or date-format arguments: ISO 8601 timestamps, prices at the symbol's own digits, single-byte encoding. Two modes (last N bars or a date range) and a switchable separator for Excel.

Writes a CSV journal of every trade with the exit reason, and a report that shows how far each trade ran, in R. It never trades.

Draws Asian, London and New York session range boxes and marks liquidity sweeps: a closed bar that wicks beyond a completed session's high or low and closes back inside. Non-repainting arrows, extended session levels, alerts and iCustom-ready buffers.

Shades the chart background by volatility regime (Compression, Normal, Expansion) based on the percentile rank of the current ATR. Shows the current regime on the chart, alerts on regime changes and exposes buffers for Expert Advisors.

Shades the chart background by volatility regime (Compression, Normal, Expansion) based on the percentile rank of the current ATR. Shows the current regime on the chart, alerts on regime changes and exposes buffers for Expert Advisors.

Opens charts for all Market Watch symbols or a custom symbol list in one click, on any timeframe, with an optional template applied to each chart. Skips charts that are already open and limits how many are opened at once.

Exports closed trades to CSV with Maximum Adverse Excursion (MAE) and Maximum Favorable Excursion (MFE) in points and money, calculated from M1 history, plus the percentage of the available move each trade captured.

A lightweight, non-trading Expert Advisor that writes a JSON health heartbeat (connection, AutoTrading state, equity, daily P/L) and an equity log, so a VPS watchdog can detect frozen or disconnected terminals and alert you.

Position size calculator for MT5. Drag the SL and TP lines on the chart and the panel shows the lot size for your risk %, the real risk after rounding, the reward and R:R. Never trades.

QCL Heikin Flow applies two-stage smoothing to Heikin Ashi candles, helping traders filter price noise and visualize trend direction. Features adjustable smoothing periods, four moving average methods, and customizable candle colors.

Clean and efficient Anchored VWAP (AVWAP) indicator for MetaTrader 5. Calculates volume-weighted average price from a user-defined anchor date with optional volatility standard deviation bands.

A rolling, Katz-style fractal dimension of price that collapses toward 1.0 during directional moves and rises toward 2.0 during choppy, range-bound action, giving traders a single number for how "trendy" the current market is.