NSF/NBF Boxes

📘 NSF / NBF Extended Boxes (Wyckoff–VSA Smart Zones)

This indicator automatically detects No Supply (NSF) and No Buying / No Demand (NBF) bars using Wyckoff–VSA principles and marks them with extended boxes and a dashed 50% midline.

🟢 NSF (No Supply) — Bullish accumulation signal
🔴 NBF (No Demand) — Bearish distribution signal

Each box extends forward in time to highlight key supply/demand zones, while the dashed midline represents the equilibrium level within that bar.
When price later retests this 50% level, the script triggers a visual marker and an alert condition, helping you spot potential reversals or continuation confirmations.

🧠 Core Features

Automatic detection of No Supply / No Demand bars

Extended boxes with adjustable length and auto-extension

Midline (50%) retest alerts for precise trade timing

Optional EMA trend filter, volume check, and close bias

Works even on symbols without volume data (crypto, indices, FX)

“Test Mode” included for easy visualization and debugging

⚙️ Usage Tips

Use on 5m–4h charts for crypto or stocks to spot professional activity.

Combine with Wyckoff, VSA, or Smart Money Concepts to confirm accumulation/distribution phases.

Look for NSF retests near support in a downtrend → possible long entry.

Look for NBF retests near resistance in an uptrend → possible short entry.

🧩 Parameters

Ignore Volume: disables volume filters for markets with missing data

Use EMA Trend Filter: only confirm signals in direction of trend

Auto-extend Boxes: keeps zones projecting into future bars

Retest Alerts: triggers when price touches midline after formation

💡 Author’s Note

This tool visualizes the often-hidden behavior of smart money absorption and weak demand exhaustion.
Use it as part of a complete trading plan — not as a standalone buy/sell signal