AlgoStorm Institutional Session Structure (ISS)

AlgoStorm Institutional Session Structure (ISS)

A complete intraday auction-structure engine that maps global session boxes (Asia, London, New York), the Globex overnight range, the Initial Balance with day-type extension targets, the Opening Range, and an automated overnight-inventory classification of the RTH open — directly onto your intraday charts.

The AlgoStorm Institutional Session Structure (ISS) indicator is designed for index futures and intraday traders who read the market through the auction lens: where overnight inventory built, whether the open printed inside or outside that inventory, whether the Initial Balance is containing rotation or the day is extending toward trend, and which session built the reference high or low everyone now trades against. It answers those questions structurally instead of drawing decorative boxes.

TIMEFRAME REQUIREMENT — READ BEFORE LOADING
This is an intraday tool. It refuses to run on 1D charts and above, and the chart timeframe should stay at or below the Opening Range length (the Opening Range and Initial Balance locks resolve at bar granularity). All session windows are DST-aware through a configurable IANA timezone, defaulting to New York time.

Technical Architecture: Fixed-Pool Session Engine
Session-structure indicators commonly rebuild their drawings on every bar, bloating chart performance and churning objects. ISS uses a different execution model:

• Per-Session Box Engines: Each session runs its own tracking engine with a private box history. The active box updates its high/low boundary in place as the session develops; boxes older than the history cap (default five days, configurable to twenty) are evicted automatically.
• Time-Window Lock Pipeline: The overnight range, Initial Balance, and Opening Range each accumulate in staging registers, then lock permanently the moment their window closes — the overnight at the RTH open, the IB and OR when their configurable minute-windows complete. Locked levels cannot move for the rest of the day.
• Extension Mathematics: Extension targets use the classic day-type formula, extension(m) = IB low + m × IB range above the market and IB high − m × IB range below it, with 1.5× and 2.0× defaults. A 1.5× tag means price has traveled 150% of the IB range from the opposite IB boundary.
• Zero-Churn Drawing Pool: Every level line and label is created exactly once at initialization and repositioned in place afterward. No per-bar create/delete cycles, no garbage-collection artifacts.
• Label Anti-Overlap Engine: Right-edge labels (ON, IB, extensions, OR) are sorted by price each bar and automatically spaced apart whenever two or more sit within a configurable minimum gap (default 0.05% of price). Level lines always stay locked to the true price — only the label text position shifts to stay readable. On by default; fully optional.
• Confirmed-Bar Alert Gate: Every alert condition is gated on confirmed bar closes inside RTH. Nothing repaints, and no alert can fire intra-bar and then vanish.

Features & Functionality

• Session Boxes: Asia, London, and New York boxes with running high/low, dotted session-open line, and session label. Defaults cover the full sessions (18:00–03:00, 03:00–09:30, 09:30–16:00 New York time); killzone-style alternatives are documented in the input tooltips.
• Overnight Range Lock: Globex high/low accumulated through the overnight window and held through the trading day — the reference frame for gap and inventory reads.
• Initial Balance + Extension Targets: First 60 minutes of RTH (configurable 15–120) with configurable extension multiples for day-type classification: containment inside the IB, 1.5× tests, or 2× trend extension.
• Opening Range: First 15 minutes of RTH (configurable 1–60) — the breakout reference for the open drive.
• Overnight Inventory Read: At the RTH open, the engine classifies the print: above the ON high, upper half of the ON range, lower half, or below the ON low — the gap-risk context before the first rotation completes.
• Session State Table: Active session, ON high/low, open-vs-ON classification, IB range (shows "forming…" while building, then the locked H/L) with a separate breakout status (inside IB vs. breakout ▲/▼), OR range and status, and which IB extensions have been tested — the whole auction state in one glance.
• Alert Suite: Eight conditions — Opening Range breakout up/down, Initial Balance breakout up/down, overnight high/low break, and upper/lower reach of the second IB extension multiple (default 2.0×, trend-day behavior). The first multiple (default 1.5×) is tracked live in the state table but does not carry its own alert.

Honest limitations: ISS is structural context, not a signal system — no entries, no exits, no arrows. Intraday levels draw for the current day only by design; historical context comes from the session boxes. If you also run our Institutional Key Levels (IKL) script, keep IKL's Initial Balance, Opening Range, and Overnight toggles off so nothing double-plots — ISS is the time-anchored view, IKL is the right-edge level strip.

Open-source under CC BY-NC-SA 4.0. Educational tool — not financial advice.