Trading APP Backend

Cryptocurrency exchange rates application based on Binance API

Application API includes three GET endpoints and one sockets endpoint

Database update and clearing are launched with a periodicity settled in .env

Installation

• git clone https://github.com/jeremy1l/trading-app.git
• Create postgres database
• Fill requared parameters in .env
  • Database credentials
  • Intervals to save/clear prices db table (in minutes)
• npm install
• npm run installapp
• npm start

Test Client

• git clone https://github.com/jeremy1l/tradesapp-client.git
• npm install
• in App.js fill endpoint url to match node backend server
• add symbols to track to array this.symbols
• npm start

API Usage

Get all system symbols:

GET /symbols

Response:

[{
    "symbol": "BTCUSDT",
    "baseasset": "BTC",
    "quoteasset": "USDT",
},...]

Latest price for a symbol.

GET /price/{symbol}  

Example: /price/BTCUSDT

Response:

{
    "symbol": "BTCUSDT",
    "price": "7255.01000000"
}

OHLC data per minute for last hour. For candlestick bars.

GET /hourly/{symbol}

Example: /hourly/ETHBTC

Response:

[{
    "OpenTime": 1535958720000,
    "Open": "7238.44000000",
    "High": "7238.44000000",
    "Low": "7233.10000000",
    "Close": "7238.00000000",
    "Volume": "4.40431300",
    "CloseTime": 1535958779999
},...]

SocketIo Stream for ticker statistics pushed every second

?symbols={symbols_separeted_by_coma}

Example: ?symbols=ETHBTC,BTCUSDT,ETHUSDT

Event name: TradesAPI

Response:

{
    "symbol": "ETHBTC",
    "eventTime": 1535964640495,
    "priceChange": "-0.00106100",
    "priceChangePercent": "-2.588",
    "weightedAvg": "0.04031640",
    "prevDayClose": "0.04098900",
    "curDayClose": "0.03992800",
    "closeTradeQuantity": "0.41900000",
    "bestBid": "0.03990900",
    "bestBidQnt": "1.49300000",
    "bestAsk": "0.03992800",
    "bestAskQnt": "8.64000000",
    "openPrice": "0.04098900",
    "highPrice": "0.04105000",
    "lowPrice": "0.03983000",
    "volume": "153274.27600000",
    "volumeQuote": "6179.46705478",
    "openTime": 1535878240492,
    "closeTime": 1535964640492,
    "firstTradeId": 80072674,
    "lastTradeId": 80194571,
    "totalTrades": 121898
}

Technologies Used

• Node.js
• Express
• SocketIo
• PostgreSQL

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