A Java library to connect cryptocurrency exchanges.
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>binanceinverse-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>binancelinear-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>bitmex-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>bitstamp-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>bybit-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>coinbasepro-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>deribit-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>ftx-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>hbdmlinear-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>hbdminverse-api</artifactId>
<version>2.15.0</version>
</dependency>
<dependency>
<groupId>io.contek.invoker</groupId>
<artifactId>kraken-api</artifactId>
<version>2.15.0</version>
</dependency>MarketRestApi api = ApiFactory.getMainNet().rest().market();
GetDepth.Response response = api.getDepth().setSymbol("BTCUSDT").setLimit(100).submit();
double bestBid = response.bids.get(0).get(0);
double bestAsk = response.asks.get(0).get(0);
System.out.println("Best bid: " + bestBid + ", best ask: " + bestAsk);ApiKey key = ApiKey.newBuilder().setId("foo").setSecret("bar").build();
UserRestApi api = ApiFactory.getTestNet().rest().user(key);
PostOrder.Response response =
api.postOrder()
.setSymbol("BTCUSDT")
.setSide(OrderSides.BUY)
.setType(OrderTypes.LIMIT)
.setPrice(9981.05d)
.setQuantity(0.03d)
.submit();
System.out.println("My order ID is: " + response.orderId);ISubscribingConsumer<Message> consumer =
new ISubscribingConsumer<Message>() {
@Override
public void onNext(AggTradeChannel.Message message) {
double price = message.data.p;
double quantity = message.data.q;
System.out.println("New trade price: " + price + ", quantity: " + quantity);
}
@Override
public void onStateChange(SubscriptionState state) {
if (state == SubscriptionState.SUBSCRIBED) {
System.out.println("Start receiving trade data");
}
}
@Override
public ConsumerState getState() {
return ConsumerState.ACTIVE;
}
};
MarketWebSocketApi api = ApiFactory.getMainNet().ws().market();
api.getAggTradeChannel("BTCUSDT").addConsumer(consumer);This project aims to provide a neat solution to connect cryptocurrency exchanges via their REST and WebSocket APIs.
It handles tedious things that are common in many exchanges, for example: rate limit, authentication, reconnection etc.
This project does not make money for you. It does not contain any logic that predicts the market.
This project does not explain the usages of API endpoints. It is absolutely necessary to read the official API document before using an endpoint.
Data scientists who want to (freely and legally) download historical market data from exchanges.
Traders who want to interact with the market programmatically.
Please make sure you are familiar with the existing code base before coding. This helps keeping the code style and project structure consistent.
We highly recommend IntelliJ as your Java IDE for this project. In addition, we also recommend using plugin " google-java-format" and plugin "Save Actions" to format your code on the fly.
Warnings significantly reduce the help you get from your IDE. Also, the more warnings you have in your existing code base, the more likely you will introduce new warnings in the future. Do your best to avoid warnings.
Your code should be clear enough to understand without any comment. You can (usually) achieve this by writing more descriptive variable names and method names. We also recommend you keep methods short and avoid nested loops whenever possible.
Do not include data/argument that is unnecessary for your purpose. It usually happens when you copy and paste code and forget to remove some fields. It may lead to rejection or unexpected outcomes.
Endpoint implementations shall always follow their official API documents. We shall make the best effort to avoid introducing random constant values that are not described in the API documents.
Example 1:
Q: I can't find a rate limit restriction for XXX endpoint, but I think there must be a limit. Shall I cap it to 10
times per minute?
A: No, because you are likely wrong.
Example 2:
Q: I found XXX endpoint accepts XXX argument, which is not specified in the API document. Shall I add it?
A: No, because it may cause unexpected outcomes.
Example 3:
Q: The example in the official document suggests the field name is XXX but in fact it is YYY. What shall I do?
A: We probably don't want to implement this endpoint yet. Wait for them to fix it first.
No.
We do not have the resources to write those tests (yet).
We do not know and we suggest you find it out in their official API document.
The current version is (probably) good enough for us already. However, feel free to update it and submit pull requests.
We are probably not using this endpoint. However, feel free to implement it and submit pull requests.
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