StartCOIN Ticker

currencies.json

{
  "START": "StartCOIN",
  "BTC": "Bitcoin",
  "USD": "US Dollar",
  "EUR": "Eurozone Euro",
  "GBP": "Pound Sterling",
  "JPY": "Japanese Yen",
  "CAD": "Canadian Dollar",
  "AUD": "Australian Dollar",
  "CNY": "Chinese Yuan",
  "CHF": "Swiss Franc",
  "SEK": "Swedish Krona",
  "NZD": "New Zealand Dollar",
  "KRW": "South Korean Won",
  "AED": "UAE Dirham",
  "AFN": "Afghan Afghani",
  "ALL": "Albanian Lek",
  "AMD": "Armenian Dram",
  "ANG": "Netherlands Antillean Guilder",
  "AOA": "Angolan Kwanza",
  "ARS": "Argentine Peso",
  "AWG": "Aruban Florin",
  "AZN": "Azerbaijani Manat",
  "BAM": "Bosnia-Herzegovina Convertible Mark",
  "BBD": "Barbadian Dollar",
  "BDT": "Bangladeshi Taka",
  "BGN": "Bulgarian Lev",
  "BHD": "Bahraini Dinar",
  "BIF": "Burundian Franc",
  "BMD": "Bermudan Dollar",
  "BND": "Brunei Dollar",
  "BOB": "Bolivian Boliviano",
  "BRL": "Brasilian Real",
  "BSD": "Bahamian Dollar",
  "BTN": "Bhutanese Ngultrum",
  "BWP": "Botswanan Pula",
  "BYR": "Belarusian Ruble",
  "BZD": "Belize Dollar",
  "CDF": "Congolese Franc",
  "CLF": "Chilean Unit of Account (UF)",
  "CLP": "Chilean Peso",
  "COP": "Colombian Peso",
  "CRC": "Costa Rican Colón",
  "CVE": "Cape Verdean Escudo",
  "CZK": "Czech Koruna",
  "DJF": "Djiboutian Franc",
  "DKK": "Danish Krone",
  "DOP": "Dominican Peso",
  "DZD": "Algerian Dinar",
  "EEK": "Estonian Kroon",
  "EGP": "Egyptian Pound",
  "ETB": "Ethiopian Birr",
  "FJD": "Fijian Dollar",
  "FKP": "Falkland Islands Pound",
  "GEL": "Georgian Lari",
  "GHS": "Ghanaian Cedi",
  "GIP": "Gibraltar Pound",
  "GMD": "Gambian Dalasi",
  "GNF": "Guinean Franc",
  "GTQ": "Guatemalan Quetzal",
  "GYD": "Guyanaese Dollar",
  "HKD": "Hong Kong Dollar",
  "HNL": "Honduran Lempira",
  "HRK": "Croatian Kuna",
  "HTG": "Haitian Gourde",
  "HUF": "Hungarian Forint",
  "IDR": "Indonesian Rupiah",
  "ILS": "Israeli Shekel",
  "INR": "Indian Rupee",
  "IQD": "Iraqi Dinar",
  "ISK": "Icelandic Króna",
  "JEP": "Jersey Pound",
  "JMD": "Jamaican Dollar",
  "JOD": "Jordanian Dinar",
  "KES": "Kenyan Shilling",
  "KGS": "Kyrgystani Som",
  "KHR": "Cambodian Riel",
  "KMF": "Comorian Franc",
  "KWD": "Kuwaiti Dinar",
  "KYD": "Cayman Islands Dollar",
  "KZT": "Kazakhstani Tenge",
  "LAK": "Laotian Kip",
  "LBP": "Lebanese Pound",
  "LKR": "Sri Lankan Rupee",
  "LRD": "Liberian Dollar",
  "LSL": "Lesotho Loti",
  "LTL": "Lithuanian Litas",
  "LVL": "Latvian Lats",
  "LYD": "Libyan Dinar",
  "MAD": "Moroccan Dirham",
  "MDL": "Moldovan Leu",
  "MGA": "Malagasy Ariary",
  "MKD": "Macedonian Denar",
  "MMK": "Myanma Kyat",
  "MNT": "Mongolian Tugrik",
  "MOP": "Macanese Pataca",
  "MRO": "Mauritanian Ouguiya",
  "MUR": "Mauritian Rupee",
  "MVR": "Maldivian Rufiyaa",
  "MWK": "Malawian Kwacha",
  "MXN": "Mexican Peso",
  "MYR": "Malaysian Ringgit",
  "MZN": "Mozambican Metical",
  "NAD": "Namibian Dollar",
  "NGN": "Nigerian Naira",
  "NIO": "Nicaraguan Córdoba",
  "NOK": "Norwegian Krone",
  "NPR": "Nepalese Rupee",
  "OMR": "Omani Rial",
  "PAB": "Panamanian Balboa",
  "PEN": "Peruvian Nuevo Sol",
  "PGK": "Papua New Guinean Kina",
  "PHP": "Philippine Peso",
  "PKR": "Pakistani Rupee",
  "PLN": "Polish Zloty",
  "PYG": "Paraguayan Guarani",
  "QAR": "Qatari Rial",
  "RON": "Romanian Leu",
  "RSD": "Serbian Dinar",
  "RUB": "Russian Ruble",
  "RWF": "Rwandan Franc",
  "SAR": "Saudi Riyal",
  "SBD": "Solomon Islands Dollar",
  "SCR": "Seychellois Rupee",
  "SDG": "Sudanese Pound",
  "SGD": "Singapore Dollar",
  "SHP": "Saint Helena Pound",
  "SLL": "Sierra Leonean Leone",
  "SOS": "Somali Shilling",
  "SRD": "Surinamese Dollar",
  "STD": "São Tomé and Príncipe Dobra",
  "SVC": "Salvadoran Colón",
  "SYP": "Syrian Pound",
  "SZL": "Swazi Lilangeni",
  "THB": "Thai Baht",
  "TJS": "Tajikistani Somoni",
  "TMT": "Turkmenistani Manat",
  "TND": "Tunisian Dinar",
  "TOP": "Tongan Paʻanga",
  "TRY": "Turkish Lira",
  "TTD": "Trinidad and Tobago Dollar",
  "TWD": "New Taiwan Dollar",
  "TZS": "Tanzanian Shilling",
  "UAH": "Ukrainian Hryvnia",
  "UGX": "Ugandan Shilling",
  "UYU": "Uruguayan Peso",
  "UZS": "Uzbekistan Som",
  "VEF": "Venezuelan Bolívar Fuerte",
  "VND": "Vietnamese Dong",
  "VUV": "Vanuatu Vatu",
  "WST": "Samoan Tala",
  "XAF": "CFA Franc BEAC",
  "XAG": "Silver (troy ounce)",
  "XAU": "Gold (troy ounce)",
  "XCD": "East Caribbean Dollar",
  "XOF": "CFA Franc BCEAO",
  "XPF": "CFP Franc",
  "YER": "Yemeni Rial",
  "ZAR": "South African Rand",
  "ZMW": "Zambian Kwacha",
  "ZWL": "Zimbabwean Dollar" 
}

package.json

{
  "name": "StartCOIN Ticker",
  "description": "A ticker script to convert a price in StartCOIN to that in a number of other currencies.",
  "version": "0.0.1",
  "author": {
    "name": "Luke Mitchell",
    "email": "hi@lukemitchell.co"
  }
  "dependencies": {
    "express": "4.12.3",
    "request": "2.54.0"
  }
}

ticker.js

var fs = require("fs");
var host = "127.0.0.1";
var port = 3000;
var express = require("express");
var request = require('request');

// Load currency names
var currencies = require('./currencies.json'); 

var usage = function(res, req) {
	var url = req.protocol + "://" + req.get("host");
	res.status(404).send("Usage: " + url + "/currency/CURRENCY or " + url + "/all");
}

// Retrieve the BTC price from Bittrex
var getBittrexPrice = function(callback) {
	var options = {
		uri: "https://bittrex.com/api/v1.1/public/getticker?market=btc-start",
		method: "GET",
		timeout: 10000,
		followRedirect: true,
		maxRedirects: 10
	};
	request(options, function (err, res, body) {
		// Catch any errors
		if (err || res.statusCode !== 200 ) {
			return callback(err);
		}

		// Success, parse and display
	    var obj = JSON.parse(body);
	    var price = parseFloat(obj.result.Last);
	    callback(null, price);
	});
}

var getBitcoinAveragePrice = function(currency, callback) {
	var options = {
		uri: "https://api.bitcoinaverage.com/ticker/global/" + currency,
		method: "GET",
		timeout: 10000,
		followRedirect: true,
		maxRedirects: 10
	};
	request(options, function (err, res, body) {
		// Catch any errors
		if (err || res.statusCode !== 200 ) {
			return callback(err);
		}

		// Success, parse and display
		if (currency == "all") {
			var obj = JSON.parse(body);
			var prices = [];
			for(var pair in obj) {
				if (obj[pair].last) {
					prices[pair] = obj[pair].last;
				}
			}
			callback(null, prices);
		} else {
			var obj = JSON.parse(body);
			price = parseFloat(obj.last);
			callback(null, price);
		}
	});
}

var app = express();

// Allow Cross-Origin-Resource-Sharing
app.use(function(req, res, next) {
	res.header("Access-Control-Allow-Origin", "*");
	res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
	next();
});

// Return all START-CURRENCY pairs
app.get("/all", function(req, res) {
	getBittrexPrice(function(err, bittrexPrice) {
		if (err) {
    		res.status(404);
    		return;
    	}
    	
    	getBitcoinAveragePrice("all", function(err, bitcoinaveragePrices) {
    		if (err) {
    			res.status(404);
    			return;
    		}

    		var prices = [];
    		for(var currency in bitcoinaveragePrices) {
    			if (currencies[currency]) {
	    			prices.push({
	    				"code": currency,
	    				"name": currencies[currency],
	    				"rate": (bitcoinaveragePrices[currency] * bittrexPrice).toFixed(8)
	    			});
    			}
    		}
    		res.send(JSON.stringify(prices));
    	});
    });
});

// Return price for individual START-CURRENCY pair
app.get("/currency/:currency", function(req, res) {
	var currency = req.params["currency"].toUpperCase();
	if (!currency) {
		return usage(res, req);
	}
    getBittrexPrice(function(err, bittrexPrice) {
    	if (err) {
    		res.status(404);
    		return;
    	}

    	getBitcoinAveragePrice(currency, function(err, bitcoinaveragePrice) {
    		if (err) {
    			res.status(404);
    			return;
    		}

    		if (currencies[currency]) {
	    		var result = {
	    			"code": currency,
	    			"name": currencies[currency],
	    			"rate": (bitcoinaveragePrice * bittrexPrice).toFixed(8)
	    		};
    		}
    		res.send(JSON.stringify(result));
    	});
    });
});

// 404 and show usage for all other requests
app.get("*", function(req, res) {
    return usage(res, req);
});

app.listen(port, host);

This is a simple express app that will serve the current price of StartCOIN in a given pair currency