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https://github.com/binance/binance-connector-java

Simple Java connector to Binance Spot API
https://github.com/binance/binance-connector-java

binance-api connector crypto java library market-data real-time spot trading

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Simple Java connector to Binance Spot API

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# Binance Public API connector Java

[![maven](https://img.shields.io/maven-central/v/io.github.binance/binance-connector-java)](https://repo1.maven.org/maven2/io/github/binance/binance-connector-java/)

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

[![Code Style](https://img.shields.io/badge/code%20style-checkstyle-yellow)](https://checkstyle.org/checks.html)



This is a lightweight library that works as a connector to the [Binance public API](https://github.com/binance/binance-spot-api-docs).



It supports the following APIs:

  - `/api/*` endpoints;

  - `/sapi/*` endpoints;

  - Spot WebSocket Market Stream;

  - Spot User Data Stream;

  - Spot WebSocket API;



Additionally, it includes test cases and examples.



## Documentation

[https://www.javadoc.io/doc/io.github.binance/binance-connector-java/latest/index.html](https://www.javadoc.io/doc/io.github.binance/binance-connector-java/latest/index.html)



## Getting Started

### Maven

Copy and paste the following dependency snippet into your `pom.xml` file, replacing `LATEST_VERSION` with the most [recent version](https://mvnrepository.com/artifact/io.github.binance/binance-connector-java) available:

```



    io.github.binance

    binance-connector-java

    LATEST_VERSION



```

Next, install the dependency by executing `mvn install` in the directory where your `pom.xml` is located.



### Gradle

Copy and paste the following dependency snippet into your `build.gradle` file, replacing `LATEST_VERSION` with the most [recent version](https://mvnrepository.com/artifact/io.github.binance/binance-connector-java) available:

```

implementation 'io.github.binance:binance-connector-java:LATEST_VERSION'

```



Make sure to add the Jitpack repository to the `repositories` section of your `build.gradle` file:

```

maven { url 'https://jitpack.io' }

```

Next, install the dependency by executing `gradle dependencies` in the directory where your `build.gradle` is located.



## Examples

The examples are located under **src/test/java/examples**. Before running any of it, `PrivateConfig.java` must be set up correctly with `API_KEY` and` SECRET_KEY` or `PRIVATE_KEY_PATH` (if using RSA Keys).



Note that this `PrivateConfig.java` is only used for examples, you should have your own configuration file when using the library.



### REST APIs



#### Market Endpoint: Exchange Information

```java

SpotClient client = new SpotClientImpl();

Map parameters = new LinkedHashMap<>();

String result = client.createMarket().exchangeInfo(parameters);

```



#### Trade Endpoint: Testing a new order

```java

SpotClient client = new SpotClientImpl(PrivateConfig.API_KEY, PrivateConfig.SECRET_KEY);



Map parameters = new LinkedHashMap();

parameters.put("symbol","BTCUSDT");

parameters.put("side", "SELL");

parameters.put("type", "LIMIT");

parameters.put("timeInForce", "GTC");

parameters.put("quantity", 0.01);

parameters.put("price", 9500);



String result = client.createTrade().testNewOrder(parameters);

```



### WebSocket Stream

```java

WebSocketStreamClient wsStreamClient = new WebSocketStreamClientImpl(); // defaults to live exchange unless stated.



// Single stream

int streamID1 = wsStreamClient.aggTradeStream("btcusdt",((event) -> {

    System.out.println(event);

}));



// Combined streams

ArrayList streams = new ArrayList<>();

streams.add("btcusdt@trade");

streams.add("bnbusdt@trade");



int streamID2 = wsStreamClient.combineStreams(streams, ((event) -> {

    System.out.println(event);

}));



// Close single stream

wsStreamClient.closeConnection(streamID1); //closes aggTradeStream-btcusdt

        

// Close all streams

wsStreamClient.closeAllConnections();

```



Different types of WebSocket callbacks are available. Please refer to the `src/test/java/examples/websocketstream/TradeStreamWithAllCallbacks.java` example file to explore their usage.



### WebSocket API

```java

RsaSignatureGenerator signatureGenerator =  new RsaSignatureGenerator("PRIVATE_KEY_PATH");

WebSocketApiClient wsApiClient = new WebSocketApiClientImpl("API_KEY", signatureGenerator); // defaults to live exchange unless stated



// Open connection with a callback as parameter

wsApiClient.connect(((message) -> {

System.out.println(message);

}));



JSONObject optionalParams = new JSONObject();

optionalParams.put("requestId", "request123");

optionalParams.put("quantity", 1);



wsApiClient.trade().testNewOrder("BTCUSDT", "BUY", "MARKET", optionalParams);



Thread.sleep(60000);



// Close connection

wsApiClient.close();

```



If `requestId` is empty (`""`), `null` or not sent, this library will generate a `UUID` string for it. 



Different types of WebSocket callbacks are available. Please refer to the `src/test/java/examples/websocketapi/WsApiwithAllCallbacks.java` example file to explore their usage.



## Features

### Testnet

While `/sapi/*` endpoints do not yet have a testnet environment, `/api/*` endpoints can be tested on the [Spot Testnet](https://testnet.binance.vision/).

You can use it by changing the base URL:



```java

Map parameters = new LinkedHashMap<>();



SpotClient client = new SpotClientImpl(PrivateConfig.TESTNET_API_KEY, PrivateConfig.TESTNET_SECRET_KEY, PrivateConfig.TESTNET_URL);

String result = client.createMarket().time();

```



### Base URL

If `baseUrl` is not provided, it defaults to `api.binance.com`.



It's recommended to pass in the `baseUrl` parameter, even in production as Binance provides alternative URLs:

- `https://api1.binance.com`

- `https://api2.binance.com`

- `https://api3.binance.com`

- `https://api4.binance.com`



### Optional parameters

Parameters can be set in any implementation of `Map` interface, where `String` represents the parameter name and `Object` the parameter value. These parameters should have the same naming as in the API doc."



```java

Map parameters = new LinkedHashMap();



parameters.put("symbol","BTCUSDT");

parameters.put("side", "SELL");

parameters.put("type", "LIMIT");

parameters.put("timeInForce", "GTC");

parameters.put("quantity", 0.01);

parameters.put("price", 9500);

```



### Response MetaData

The Binance API server provides weight usages in the headers of each response, which can be returned if you set `setShowLimitUsage(true)`.

```java

SpotClient client = new SpotClientImpl();

client.setShowLimitUsage(true);

String result = client.createMarket().time();

logger.info(result);

```

Output:

```

INFO: {"data":"{"serverTime":1633434339494}","x-mbx-used-weight":"1","x-mbx-used-weight-1m":"1"}

```



### Proxy

To set HTTP Proxy, call `setProxy()` with `ProxyAuth` and before submitting requests:



```java

SpotClient client = new SpotClientImpl();

Proxy proxyConn = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 8080));

ProxyAuth proxy = new ProxyAuth(proxyConn, null);



client.setProxy(proxy);

logger.info(client.createMarket().time());

```



For authenticated `Proxy`, define `ProxyAuth` with [`Authenticator` from `okhttp3`](https://square.github.io/okhttp/3.x/okhttp/index.html?okhttp3/Authenticator.html):



```java

SpotClient client = new SpotClientImpl();

Proxy proxyConn = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 8080));

Authenticator auth = new Authenticator() {

    public Request authenticate(Route route, Response response) throws IOException {

        if (response.request().header("Proxy-Authorization") != null) {

            return null; // Give up, we've already failed to authenticate.

          }

      

        String credential = Credentials.basic("username", "password");

        return response.request().newBuilder().header("Proxy-Authorization", credential).build();

        

    }

};

ProxyAuth proxy = new ProxyAuth(proxyConn, auth);



client.setProxy(proxy);

logger.info(client.createMarket().time());

```



To undo `Proxy`, use `unsetProxy()` before submitting requests:

```java

client.unsetProxy();

logger.info(client.createMarket().time());

```



Complete examples are available at `src/test/java/examples/spot/proxy` folder.



### Logging

This connector uses [`SLF4J`](https://www.slf4j.org/) as an abstraction layer for diverse logging frameworks.



It's end-user's responsibility to select the appropriate `SLF4J` binding to use as the logger (e.g, `slf4j-jdk14` or `logback-classic`).

Otherwise, you might see the following informative output:



```shell

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

```



In case you want to use our custom `logback-classic`, it's available at [`binance-logback`](https://central.sonatype.com/artifact/io.github.binance/binance-logback).



If you prefer to not use a logger and suppress the `SLF4J` messages instead, you can refer to `slf4j-nop`.



### Types of Signature Generator

When creating `SpotClient`, `WebSocketStreamClient` or `WebSocketApiClient`, you use one of the following types of Signature Generator to create signatures (for SIGNED endpoints) based on your security preference:



- `HmacSignatureGenerator` - Use of API Key and Secret Key.

```java

  HmacSignatureGenerator signGenerator = new HmacSignatureGenerator("SecretKey");

  SpotClient client = new SpotClientImpl("ApiKey", signGenerator);

```



- `RsaSignatureGenerator` - Use of API Key and RSA algorithm keys.

```java

  RsaSignatureGenerator signGenerator =  new RsaSignatureGenerator("PathToPrivateKey"); 

  // or if Private Key is protected

  // RsaSignatureGenerator signGenerator = new RsaSignatureGenerator("PathToPrivateKey", "PrivateKeyPassword")

  SpotClient client = new SpotClientImpl("ApiKey", signGenerator);

```



- `Ed25519SignatureGenerator` - Use of API Key and Ed25519 algorithm keys.

```java

  Ed25519SignatureGenerator signGenerator =  new Ed25519SignatureGenerator("PathToPrivateKey");

  SpotClient client = new SpotClientImpl("ApiKey", signGenerator);

```



## Errors



There are 3 types of error which may be thrown by this library.



- `BinanceConnectorException`

  - This is thrown when there is a validation error for parameters.For instance, mandatory parameter not sent. This error will be thrown before the request is sent to the server.

- `BinanceClientException`

  - This is thrown when server returns `4XX`, it's an issue from client side.

  - The error consists of these 3 objects which will help in debugging the error:

    - `httpStatusCode` - HTTP status code

    - `errorCode` - API Server's error code, e.g. `-1102`

    - `errMsg` - API Server's error message, e.g. `Unknown order sent.`

- `BinanceServerException`

  - This is thrown when server returns `5XX`, it's an issue from server side.

```java

try {

      String result = client.createTrade().newOrder(parameters);

      logger.info(result);

    } catch (BinanceConnectorException e) {

      logger.error("fullErrMessage: {}", e.getMessage(), e);

    } catch (BinanceClientException e) {

      logger.error("fullErrMessage: {} \nerrMessage: {} \nerrCode: {} \nHTTPStatusCode: {}",

      e.getMessage(), e.getErrMsg(), e.getErrorCode(), e.getHttpStatusCode(), e);

    }

```



## Test Cases

`mvn clean test`



## Contribution

Contributions are welcome!



If you've found a bug within this project, please open an issue to discuss what you would like to change.



If it's an issue with the API itself, you can submit on the [Binance Developer Community](https://dev.binance.vision)