No Supply (Low-Volume Down Bars) — Ido

This indicator flags classic Wyckoff/VSA “No Supply (NS)” events—down bars that print on unusually low volume, suggesting a lack of sellers rather than strong selling pressure. NS often appears near support, LPS, or within re-accumulation ranges as a test before continuation higher.

Signal definition (configurable):

Down bar: choose Close < PrevClose or Close < Open.

Low volume: Volume < SMA(Volume, len) × threshold (e.g., 0.7).

Optional volume lower than the prior two bars (reduces noise).

Optional narrow spread: range (H–L) below its average.

Optional close position: close in the upper half of the bar.

Optional trend filter: only mark NS above or below an EMA (or any).

Optional wide-bar exclusion: skip unusually wide bars.

Visuals & outputs

Blue dot below each NS bar (optional bar tint).

Separate pane showing Relative Volume (vol / volSMA) to gauge effort.

Built-in alertcondition to trigger notifications when NS prints.

Inputs (high level)

lenVol: Volume SMA length.

ratioVol: Volume threshold vs. average (e.g., 0.7 = 70%).

usePrev2: Require volume below each of the prior two bars.

useNarrow + lenRange + ratioRange: Narrow-bar filter.

useClosePos + minClosePos: Close in upper portion of the bar.

downBarMode: Define “down bar” logic.

trendFiltOn, trendLen, trendSide: EMA trend filter.

useWideFilter, lenRangeWide, wideThreshold: Skip wide bars.

How to use (Wyckoff/VSA context)

Treat NS as a test of supply: price dips, but volume is light and close holds up.

Stronger when it prints near support/LPS within a re-accumulation structure.

Confirmation (recommended): within 1–3 bars, see demand—e.g., break above the NS high with expanding volume (above average or above the prior two bars). Many traders place a buy-stop just above the NS high; common stops are below the NS low or the most recent swing low.

Scanning tip

TradingView’s stock screener can’t consume Pine directly.
Use a Watchlist Custom Column that reports “bars since NS” to sort symbols (0 = NS on the latest bar). A companion column script is provided separately.

Notes & limitations

Works on any timeframe (intraday/daily/weekly), but context matters.

Expect false positives around news, gaps, or illiquid symbols—combine with structure (trend, S/R, phases) and risk management.

© moshel — Educational use only; not financial advice.