ccex-api

Cryptocurrency exchanges client api wrapper.

Features

These features are supported with all major exchanges

• Public realtime api.
• Public rest api.
• Support for both Nodejs and Browser (Webpack, React, Angular...see samples below) environments.
• Modular structure make sure you include minimum code as you need (especially for client side application).
• Option to bypass cors request problem in browser with proxy.
• More to come: Tradingview realtime datafeed, private rest api with api/secret key...

Prequisite

• Using crypto to sign private request requrie node 10.
• This library is built on top of Typescript and Rxjs (v6). All async functions will return an observable stream so familiar with Rxjs would be an advantage but basically using stream .subscribe((data) => {/**/}) method should be sufficient. You can also easily turn an one-time-complete observable (rest API request) into promise using .toPromise() to be used with async await.

Sample

• Demo
• Angular sample
• Production
• React
• Webpack typescript
• Vue (TODO)

Supported Exchanges

Binance, Bitbank, Bitfinex, Coinbase

	id/docs	homepage	version	origin	country
	binance	Binance	*	API	China
	bitbank	Bitbank	*	API	Japan
	bitfinex	Bitfinex	2	API	British Virgin Islands
	coinbase	Coinbase	*	API	US

Roadmap (TODO)

Task	Date	Status
Binance Private User Data Stream	2018/09	✅
Binance Private Api	2018/12
Bitbank, Bitifnex, Coinbase private stream	2019/Q1
Huobi, Okex	2019/Q1
More exchanges	2019/Q2
Python and Go version	2019/Q3, Q4

Usage

This library is designed to be usable in both nodejs and browser (with frontend framework like Angular, React, Vue..., with bundle tools like Webpack or Rollup having typescript configured, the umd javascript file coming later) environments.

When used in browser environment, the browser must support for native

• fetch
• websocket

Installation

npm i --save ccex-api

Simple use

import { BinanceApi } from 'ccex-api/exchanges/binance;

const binanceApi = new BinanceApi();

binanceApi.fetchTicker$('btc_usdt').subscribe(ticker => console.log(ticker));
binanceApi.ticker$('btc_usdt').subscribe(ticker => console.log(ticker));
setTimeout(() => { binanceApi.stopTicker('btc_usdt') }, 5000);

Or you can include only the part that you need

import { BitbankCandlestick } from 'ccex-api/exchanges/bitbank/candlestick;

const bitbankCandlestick = new BitbankCandlestick();
bitbankCandlestick.getApproximateHistoryPrice('btc_jpy', 1526917534904, 1).subscribe(price => console.log(price));

Api

Basically all exchanges have these following unified, generalized api implemented.

api	params	return value	desctiption
exchangeInfo		ExchangeInfo
markets		string[]	All supported markets (pair)
representativeMarkets		string[]	Major supported markets (used for test purpose)
supportFeatures		SupportFeatures
fetchTicker$	pair: string	Observable<Ticker>	api request for ticker
ticker$	pair: string	Observable<Ticker>	realtime ticker stream
stopTicker	pair: string		stop realtime ticker stream
fetchTrades$	pair: string	Observable<Trade>	api request for trade
trade$	pair: string	Observable<Trade>	realtime trade stream
stopTrade	pair: string		stop realtime trade stream
fetchOrderbook$	pair: string	Observable<Orderbook>	api request for orderbook
orderbook$	pair: string	Observable<Orderbook>	realtime orderbook stream
stopOrderbook	pair: string		stop realtime orderbook stream
fetchCandleStickRange$	pair: string minutesFoot: number start: number end: number	Observable<CandleStick[]>	api request for candlestick
lastCandle$	pair: string minutesFoot: number lastCandle: CandleStick	Observable<CandleStick>	Realtime candlestick stream, calculated from an initial lastCandle and realtime trade stream. This function is useful in implementing Tradingview datafeed

Besides, an exchange may have more specific functions, it depends on exchange provided features and implementation. In that case, specific guide for that exchange will be located at exchanges/{exchange}/README.md (TODO)

Contribution guide

In order to add a new exchange, simply clone folder src/exchanges/sample, rename, implement functions and include appropiate tests for sub-modules (ticker, orderbook...) and some internal functions.

Finally make sure the exchange sample pass predefined test by running

npm run test sample

If you find a bug or anything should be added to fit your need, please create issue. This is still in very early stage so any feedback would be much appreciated.

Test

We can test all or 1 specific exchange. Note that a realtime test can fail by timeout according to server data stream coming late.

Test all

npm run test

Test specific exchanage

npm run test binance
npm run test bitbank

Dependencies

• Rxjs (v6 or above)
• Optional
  • pubnub (bitbank api)
  • node-fetch (nodejs environment)
  • ws (nodejs environment)