Nadaraya Watson Envelope Scanner MT4

Mean reversion is a numbers game, and the numbers live on more charts than you can watch. Nadaraya Watson Envelope Scanner runs a causal, non-repainting kernel regression envelope across your symbol list on up to four timeframes at once, prints every re-entry with its age, and marks the rows where the timeframes agree. Out of the box it scans fifteen pairs; one setting raises that to twenty-eight. The envelope itself draws on the chart in front of you, so you act on what the table found without attaching a second indicator.

The chart half is Nadaraya Watson Envelope itself: a causal Nadaraya-Watson kernel regression centre line, an envelope built from the mean absolute error around it, and marks where price came back inside the envelope after having traded outside it. The board half runs the same calculation over the list and puts the answer in a table: the board tells you where to look, and the chart under it shows you what is actually there.

The board

A row per symbol, a column per scanned timeframe, up to four of them, on up to twenty-eight symbols; fifteen are scanned out of the box and the maximum is one setting away. The symbol list is comma separated, or the board can take the Market Watch list instead. Broker prefix and suffix are detected from the chart you are on, or given by hand. Out of the box the board scans four: M15, H1, H4 and D1.

A cell reads like ^14b: a direction glyph, then how many bars ago that signal happened. The word flat means the calculation ran and found no direction there. Three dots mean the cell has not been measured yet, and with tooltips switched on, hovering it says why in words. A cell whose signal is older than the freshness threshold is drawn in the same colour, quieter, so the hue says which way and the weight says how much it still matters. A row with a fresh signal anywhere in it gets a wash of the accent colour so your eye lands on it before you have read a single cell.

The AGREE column is the point of the board. It takes the visible timeframe columns for that symbol, finds the majority side, and prints it as v3/4: the direction the majority agrees on, and how many of the visible timeframes stand on it. A row where every visible timeframe agrees is drawn bold and in that side's colour, because that is the row the board exists to surface. A tie prints a dash and counts as no verdict, because calling a one-one split a signal would be the board inventing conviction it does not have. With only one timeframe visible the column is dropped entirely, header and all, rather than showing a 1/1 that restates the cell beside it.

Every column header is a button. Click a timeframe header and the board sorts by that column, the freshest signal on that timeframe first, and rows with none in it go to the bottom together. Click the same header again to reverse. Click AGREE to sort by agreement, with full agreement first and a full house outranking a partial one of the same count. The active column is drawn in the accent colour with a caret showing the direction, so the sort state is on the header itself. There is also a Sort button that cycles freshest, grade and name, for when you want a whole-board order rather than a column order.

A Show button cycles all, buys, sells and fresh. Buys and sells follow the AGREE verdict rather than any single cell, so a row you see under buys always reads an up glyph in AGREE. A tie shows under neither. This filters the view, not the calculation: a hidden row is still being measured and can still alert.

The legend sits above the table and decodes the notation in one line: up glyph, down glyph, bars since, and what the AGREE fraction means. It can be switched off once you know it by heart.

Timeframe buttons at the top show and hide a column. Hiding one does not stop the calculation measuring it.

The row count is fitted to the height of the chart pane, and the row setting is a maximum rather than a demand. When everything fits, no page buttons are drawn at all. When it does not, previous and next buttons appear with the page number on them. Because the board never draws more rows than the pane holds, the page buttons are always on screen and always reachable, however tall the row setting is.

Clicking a cell switches this chart to that symbol and that timeframe. It does not open a window per click.

Two status lines are always on show: how many symbols are ready of how many, how long ago the board last updated, and how many signals it found in the lookback window, then either the watchdog's own line or a sentence explaining why nothing is showing.

Diagnostics

A second panel, off by default, that answers "why is there no signal". It lists the symbol coverage, which series are short of bars and by how much, how many signals were found in the window, and how many symbols this indicator switched on in Market Watch to do its job. It names the stage a cell failed at rather than leaving the cell blank without explanation.

The chart indicator

Drawn in the price window: the centre line coloured by its slope, the upper and lower envelope, and BUY and SELL marks. It can be turned off from the Styles tab if you only want the board. Its timeframe is set separately from the board's timeframes: the board scans several, the chart draws one.

The settings sheet

The gear opens three tabs. Values holds the timeframe, the window N, the bandwidth h and the envelope multiplier, each with steppers, a range and a sentence of help. Changing one here recalculates the whole board and the panel says so while it works, with a count of how many symbols it has redone.

Alerts holds the master switch, the per-event switches, the channels, the cooldown and a test button.

Styles holds show the legend, draw the indicator on this chart, palette, show the centre line, the envelope and the arrows, line width and arrow size. These are the same display controls the matching single-chart indicator carries, under the same names, so a chart set up one way can be reproduced on the other.

Three colour schemes are available, including a colour-blind safe one that uses blue and orange and never puts red against green. Panel position, scheme, collapsed state, the sort, the filter, which timeframe columns are visible and every value changed on the sheet are stored per chart and survive a timeframe change and a terminal restart. The interface is English.

Alerts

Off out of the box. A master switch on the panel itself turns them all on or off without opening the sheet, and there is a Test alert button that fires through every channel currently on.

Events: a fresh BUY and a fresh SELL, declared separately for each scanned timeframe, plus data health, which speaks when a symbol loses or regains its data. There is a minimum grade setting, and this port does not grade, so every signal counts as grade one for that purpose.

Channels: popup window, sound, push to the mobile terminal, e-mail. Cooldown is per cell and per event, thirty minutes by default, because a board watching many symbols has many more chances to repeat itself than a single chart does. Telegram is not part of this product.

Cost

The work is budgeted. A set number of symbols is refreshed per timer tick, lower being gentler on a slow machine, so a long list spreads its load out instead of stalling the terminal. The first pass is visibly progressive and the panel says what percentage of the symbols it has measured.

Reading it from an EA

The chart indicator publishes twelve buffers on this platform, readable through iCustom. This map is not the MetaTrader 5 edition's map: MQL4 has no colour-indexed plots, so the slope-coloured centre line is drawn as a pair of plain lines and the indices behind them shift.

Buffer 0, Buy, holds the mark price on a BUY bar and EMPTY_VALUE otherwise, and it is not drawn; buffer 1, Sell, is the same for a SELL bar. Buffers 2 and 3 are the centre line as its two display halves, one while it rises and one while it falls. Buffer 4, Upper, and buffer 5, Lower, are the two envelope edges. Buffers 6 and 7 are the drawn copies of buffers 0 and 1. Buffer 8 is the centre line as one continuous series, the same values the MetaTrader 5 edition publishes at its index 2, and buffer 9 is its colour index. Buffer 10, Signal, reads +1 for a re-entry from below, -1 for a re-entry from above and 0 for none. Buffer 11, Slope, is +1 while the centre is rising and -1 while it is falling.

The Data Window lists the eight drawn rows. The contract behind them, buffers 8 to 11, does not appear there, and that proves nothing: iCustom reads every index above just the same. An EA that wants the centre line by value reads buffer 8.

Buffers 0 and 1 are the EA contract. They are never painted, and they are filled on every pass whatever the Styles tab is set to, so nothing on the display side can starve a strategy of a signal. There is no Override buffer here, which is one index this map does not share with the single-chart Nadaraya Watson Envelope MTF: there the panel override counter ends the map, here it does not exist.

MQL4 has no input groups, so the parameter list an EA passes to iCustom here is shorter than the MetaTrader 5 edition's, and the positions differ. Build the call against this edition's input list, not the other platform's. An instance created by iCustom is read-only and always uses the parameters you passed.

The board itself is a panel, not a buffer. It is read by eye and by alert.

Honest limits

The board reads closed bars, and a cell's age is counted in closed bars: a value published on a closed bar does not change afterwards. The mark on the current forming bar of the chart indicator can appear and disappear before that bar closes.

AGREE is a count of timeframes, not a probability. Four timeframes pointing the same way means four correlated readings of the same instrument agreed, which is worth knowing and is not a forecast.

A tie deliberately produces no verdict, and rows with a tie are hidden by both the buys and the sells filters. That is the honest answer rather than a missing one.

Scanning has a cost. Twenty-eight symbols on four timeframes is a hundred and twelve cells and it will be felt on a slow machine. The budget setting is what you turn down.

A symbol your broker does not carry, or one with too little history for the kernel window, cannot be measured. The board says which, and why, rather than showing an empty cell.

No profit figure, win rate or backtest result is claimed here.