Accumulation/Distribution Line (AD)

The Accumulation/Distribution Line (ADL) is a volume-weighted technical indicator that tracks the cumulative flow of money into or out of an asset over time. It is built on the concept of the Money Flow Multiplier, which compares where the closing price falls within the period's high-low range. If the close is near the high, the multiplier is positive, indicating buying pressure; if the close is near the low, it is negative, indicating selling pressure. This multiplier is then applied to the period's volume and added to a running cumulative total, forming the ADL.

The ADL is primarily used to confirm price trends and spot divergences. When both price and the ADL are rising together, the uptrend is considered healthy and well-supported by volume. However, when price makes new highs while the ADL fails to follow — or begins to decline — it signals that volume is not backing the price move, which often precedes a reversal. The same logic applies in downtrends: if price falls to new lows but the ADL holds steady or rises, it may indicate that selling pressure is waning and a bounce is approaching.

For cryptocurrency algorithmic traders, the ADL provides crucial context that pure price-based indicators miss. Crypto markets are notorious for price spikes driven by thin order books, where a relatively small amount of buy or sell pressure can move prices dramatically. The ADL helps cut through this noise by weighting price movement by actual volume, making it harder for low-volume manipulations to generate false signals. Bots that incorporate the ADL alongside trend-following or reversal indicators can produce higher-quality entries by ensuring that volume confirms the trade direction.