Accumulation Swing Index (ASI) is one Forex Technical Indicator used in Technical Analysis. This indicator is an Oscillator based on the Swing Index. This also a variation of Welles Wilder’s swing index. It plots a running sum of the Swing index value of each beam. The Swing Index is a value from 0 to 100 for one to bar and 0 to -100 for a down bar.

ASI has been created by Wales Wilder as ordinary fluctuations indicator that signals from the previous maximum and minimum price. Once, Wilder said: “Somewhere in the middle of the maze of open, high, low and close prices is a phantom line is the actual market.” What helps us reveal these phantom line is the accumulation index.

Wilder notes the following features of the swing Accumulation Index:
- It provides a numerical value, price swings quantified.
- It defines short-term swing points.
- It cuts through a maze of high, low and close prices and shows the real strength and direction of the market.

An outbreak is when the swing Accumulation Index exceeds the value on the day when a former high significant swing point was made. A disadvantage breakout is appropriate if the value of the swing Accumulation index falls below its value on a day when a previous significant Swing Low point was made.

You can confirm trendline breakouts by comparing the trend lines in the cumulative index to swing trend lines in the price chart. A false breakout, if a trend line drawn on a price chart penetrated, but a similar trend line drawn in the swing Accumulation index is not penetrated.

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From Investopedia
The accumulation swing index (ASI) is a variation of Welles Wilder’s swing index. It plots a running total of the swing index value of each bar. The swing index is a value from 0 to 100 for an up bar and 0 to -100 for a down bar. (full article)

From MQL4
ASI was created by Wales Wilder as an ordinary fluctuations indicator that gets signals from previous maximums and minimums of price. Once, Wilder said: “Somewhere amidst the maze of Open, High, Low and Close prices is a phantom line that is the real market.” What helps us reveal this phantom line is the cumulation index. (full article)