OPEN-SOURCE SCRIPT

All Session Levels (Futures) - Asia, London, Overnight, NY Prior

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A session-levels built for trading during the New York session on the Micro Dow (MYM), though it works on any index future or intraday symbol. The core idea: the Asia and London sessions are thin and choppy on the Dow because the underlying US cash market is closed; rather than trading those sessions directly, this indicator plots the key levels they leave behind and helps you trade them when real volume arrives at the 9:30 ET open.

What it plots
  1. Asia session high/low (default 8:00 PM–2:00 AM ET) — overnight liquidity pools.
  2. London session high/low (default 3:00 AM–8:00 AM ET) — the more recent, more relevant overnight range.
  3. Overnight high/low (ONH/ONL) — the full overnight range.
  4. Prior day NY high/low/close — the most-watched daily references, drawn per-day so they don't stretch across chart history.
  5. 9:30 NY open marker and a shaded 9:30–10:30 killzone highlighting the highest-probability window.
  6. Auto-detected supply and demand zones — the script identifies base-then-impulse departures (a tight consolidation candle followed by a strong directional move) and draws the base as a zone. Zones remain on the chart only until mitigated: once price closes fully back through a zone, it's automatically removed, so you only ever see live, untested zones.
  7. Info dashboard (top-right) listing every current level and its price.


Alerts
Eight built-in alert conditions: level breaks (London, Asia, and overnight highs/lows) and zone taps (when price enters the most recent unmitigated demand or supply zone). Create them via the alarm-clock icon after adding the indicator; "Once Per Bar Close" is recommended for the break alerts.

How to use it
Set your chart timezone to America/New York (or adjust the timezone input to match your data feed).
Run it on an intraday timeframe, 3m to 15m is the sweet spot; 5m is a good all-round default.
Before the open, review the plotted overnight and prior-day levels.

In the 9:30–10:30 window, watch for price interacting with those levels: a clean break-and-hold for continuation, or a failed break that snaps back inside the range for a reversal.
Use the confluence of a zone tap, price extended past VWAP, and volume for entry confirmation.

Notes and settings
All session windows are fully adjustable in the settings, as are colors, and the supply/demand sensitivity (impulse strength, base size, lookback, and max zones per side).
The overnight window contains the Asia and London windows by design, so ONH/ONL will often overlap those extremes — toggle it off if you prefer less overlap.
The zone-tap alerts track only the most recent unmitigated zone on each side to avoid alert spam.

Disclaimer
This is an analysis and charting tool, not a trading system or financial advice. It does not generate buy/sell signals or guarantee any outcome. Levels and zones are calculated from historical price and session times; past behavior does not predict future results. Always do your own analysis and manage your own risk.

Penafian

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