Big Notional Volume Bubbles (Lower-TF Order Flow Approximation)

Big Notional Volume Bubbles (Lower-TF Order Flow Approximation)

### Overview

This indicator visualizes large notional trading activity by scanning lower-timeframe candles inside each chart bar and highlighting periods where unusually high traded value (volume × price) occurs.

This script is intended to help short-term traders and scalpers identify bursts of aggressive activity, potential absorption zones, and areas of heightened participation, using standard OHLCV data.

Important: This indicator does not access true market order tape or DOM data. It is an approximation based on lower-timeframe OHLCV data provided by TradingView.



What the Indicator Shows

• Each bubble represents a lower-timeframe candle where traded notional value exceeds a user-defined threshold.
  
• Bubble size scales with the notional value of that candle.
  
• Green bubbles indicate the lower-timeframe candle closed higher (buy-side pressure approximation).
  
• Red bubbles indicate the lower-timeframe candle closed lower (sell-side pressure approximation).
  
• Bubbles can be plotted at candle closes or wick extremes for contextual analysis.
  

How It Works

1. Lower-timeframe OHLCV data is requested using `request.security_lower_tf`.
2. Notional value is calculated as volume × price for each micro-candle.
3. The script selects the largest notional events per bar that exceed the minimum threshold.
4. These events are rendered as bubbles on the main price chart.


Intended Use Cases

• Scalping and short-term trading
  
• Momentum ignition and continuation analysis
  
• Absorption and failed breakout detection
  
• Effort versus result analysis
  
• Confirmation at key structural levels
  

Recommended Settings

1. Lower timeframe: Start with 1 (1 minute). Seconds-based timeframes may not be supported on all feeds.
   
2. Minimum notional (USD/USDT):
   

• BTC / ETH: 25,000 – 250,000
  
• Mid-cap assets: 5,000 – 50,000
  
• Adjust based on liquidity and volatility
  
• Max bubbles per bar: 3–8 to avoid visual clutter
  

Limitations

• This indicator does not display individual market orders or aggressor-side execution.
  
• Buy/sell classification is inferred from candle direction, not bid/ask data.
  
• Lower-timeframe data availability depends on the selected symbol and exchange feed.
  
• This tool should not be used as a standalone signal generator.
  

Best Practices

• Use in conjunction with market structure, VWAP, and key price levels.
  
• Focus on price behavior after a bubble appears rather than the bubble itself.
  
• Interpret bubbles as areas of interest, not directional guarantees.