This app pulls data from Alpha Vantage Foreign Currency Intraday Trading API and does basic technical analysis. It also updates the charts on a per minute basis.
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Due to the free API callback limit of Alpha Vantage, even if items are changed from the dropdown menus, the charts may not get updated before the 1 minute designated time. A premium subscription can be bought to have a better experience.
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Data pulled from Alpha Vantage are only upto 4 decimal places, thus the charts might not be as precise as they should be.