SmartPrice

Average/aggregate price return from specified exchanges for smart contract cryptocurrencies

About

Uses the CCXT library to simplify API calls. Uses the average ticker price from each exchange if available, otherwise uses average of last ask and last bid.

Installation/Usage

smartprice can be cloned and ran from the source, or can be installed as an npm module. We describe the npm installation/usage below. First, install the package in your working directory like so:

npm install smartprice --save

Require and use smartprice in your project. There is currently only one method and one property right now. Typical usage would be to call the updatePrice function, which takes two parameters and returns an ES6 Promise. The two parameters are an array of currency pairs to update, and an optional array of exchanges to exclude. After the updatePrice function has been executed, the result of the resolved promise can be read, or the priceObj property can be read directly. Ex:

const sp = require('smartprice');

// update the price of ETH/USD crypto pair, and exclude the 'kraken' exchange from pricing
sp.updatePrice(['ETH/USD'], ['kraken']).then(result => {
  console.log(result);
});

console.log(sp.priceObj);

/* Example priceObj result:
{ 'ETH/USD':
  { bitstamp: 1147.6399999999999,
    gemini: 1145.175,
    dsx: 1098.901098901099,
    bitfinex: 1156.7,
    avgPrice: 1138.3, // average price rounded to two decimal places (ideal for fiat pairs)
    avgPricePrecise: 1138.30021978, // average price rounded to eight decimal places (common precision amongst cryptos)
    date: 2018-02-01T05:38:42.103Z
  }
}
*/

priceObj can be read repeatedly without out consequence, but calling updatePrice too often has the chance to trigger API rate-limiting by different exchanges.

Currently supported

Currently only looks up crypto pairs using Bitstamp, Kraken, Bitfinex, GDAX, Gemini, Binance, DSX, HuobiPro, CEX.IO, and Poloniex exchanges as price sources.