Java API client for the Kraken cryptocurrency exchange: kraken.com.

This library unmarshalls JSON responses into the Java objects (e.g. Trade, Quote,...). A wide collection of Java support objects is provided in this library, designed to be API-agnostic and preferably support additional exchanges in the future.

This project is an early work in progress. Once completed it's planned to be integrated with the Chartsy|One platform. Currently only public API methods are supported.

Roadmap

Publish unit and integration tests.
Implement Private API methods.
AI assisted trading.

Project dependencies

GSON
Apache Http Components Client

Example usage

1. Basics

Kraken API methods are available through the KrakenService object, which can be instantiated using a static factory method:

    KrakenService service = KrakenService.getInstance();

2. Loading hourly OHLC data:

    Quotes quotes = service.getQuotes(new Symbol("XBTUSD"), TimeFrame.Period.H1);
    System.out.println("Number of Bars = " + quotes.length());
    System.out.println("First Bar = " + quotes.getFirst());
    System.out.println("Last Bar = " + quotes.get(0));

The library supports a basic set of technical and statistical indicators. For example the following code loads hourly OHLC data and calculates the 14-period Average True Range of the result:

    Quotes quotes = service.getQuotes(new Symbol("XBTUSD"), TimeFrame.Period.H1);
    Series atr = quotes.atr(14);
    System.out.println("Current ATR Value = " + atr.get(0));

3. Downloading all historical ticks to a CSV file:

    KrakenService service = KrakenService.getDefault();

    DecimalFormat df = new DecimalFormat("0.########");
    BufferedWriter out = new BufferedWriter(new FileWriter(FILENAME));
    LocalDateTime startDate = Chronological.toDateTime(0);
    try {
        int k = 0;
        while (true) {
            try {
                List<Trade> ticks = service.getTradeTicks(new Symbol("XBTUSD"), startDate);
                if (ticks.size() == 0)
                    break;
                System.out.println("TICK PACK OF " + ticks.size() + " TICKS LOADED:");
                System.out.println(ticks.get(0));
                System.out.println(ticks.get(1));
                System.out.println(ticks.get(2));
                System.out.println(ticks.get(ticks.size()-1));
                System.out.println(ticks.size());
                System.out.println("LOOP COUNT " + ++k);

                for (Trade tick : ticks)
                    out.write(tick.getSymbol() + ";" + tick.getDateTime().toString().replace('T', ';') + ";" + tick.getPrice() + ";" + df.format(tick.getVolume()).replace(',', '.') + ";" + ((tick.getDirection() == Direction.BUY_ASK)? "L" : (tick.getDirection() == Direction.SELL_BID)? "S" : "") + "\r\n");
                out.flush();
                startDate = ticks.get(ticks.size()-1).getDateTime();
            } catch (KrakenServiceUnavailableException e) {
                System.out.println(e);
                Thread.sleep(2L);
            }
        }
    } finally {
        out.close();
    }