The Accumulative Swing Index tracks price swings to reveal trend direction and divergences, helping commodity traders confirm breakouts and spot potential reversals early.
This technical indicator guide covers what the accumulative swing index is useful for as a technical indicator for traders.
We use an example chart to show how an accumulative price index may show potential buy or sale signals.
What Is The Accumulative Swing Index?
Developed by Welles Wilder in his popular technical analysis book New Concepts in Technical Trading Systems, the Accumulative Swing Index (ASI) is mainly used as a divergence and confirmation tool, but can be used for buy and sell signals as well.
It was designed to be used for futures trading, but can be used for stock trading and currency trading too.
Basically, the Accumulative Swing Index is a running total of the Swing Index.
Accumulative Swing Index as a Confirmation Tool
In the chart shown below, the Accumulative Swing Index confirmed Gold’s downtrend. Subsequently, when Gold broke the downward trendline, the Accumulative Swing Index confirmed the trendline break as well.
Similarly, the upward move in the Gold futures contract was confirmed by the Accumulative Swing Index and the upward trendline break was confirmed too.
Potential Buy Signal – Accumulative Swing Index
A trader might consider a buy signal when the Accumulative Swing Index breaks above a downward trendline or, in a price consolidation period, above resistance.
Potential Sell Signal – Accumulative Swing Index
Contrastly, a trader might consider a sell signal when the Accumulative Swing Index breaks below an upward trendline or, in a price consolidation period, below support.
In summary, the Accumulative Swing Index is best used as a confirmation tool with other technical indicators and charting patterns like support & resistance indicators.
Where To Trade Commodities
Further Reading on Volume Indicators
These volume tools complement Accumulative Swing Index: Accumulation Distribution, Herrick Payoff Index, and Open Interest.
Technical analysis is most widely used in CFD and forex trading. If you’re ready to apply these techniques, browse our vetted CFD brokers or forex brokers.
Update history
This page was revised 4 times between August 2020 and April 2026.
Added broker recommendation section with links to CFD and forex broker listings in Further Reading.
Removed broker comparison table and regional broker listings, consolidated Further Reading section to focus on complementary volume indicator tools.
Restructured page with new intro, table of contents, clearer section hierarchy, relocated broker information under "Where To Trade Commodities," and added cross-linking to related trading guides.
Reorganized content structure by separating introductory definition from detailed sections on confirmation signals and buy/sell signals, while fixing "Contrastly" to "Contrastly."
The Commodity Briefing
The stories behind the prices. Surprising, useful, occasionally weird - in your inbox every weekday.
- Price moves
- Supply shocks
- Macro drivers
Before you go
Get The Commodity Briefing - free, 2 minutes.