APIRest

script-2.js

var req = new XMLHttpRequest();
var data = {};
if('withCredentials' in req){
	req.open('GET', 'https://api.blinktrade.com/api/v1/BRL/ticker', true);
	req.setRequestHeader('Content-Type', 'application/json');
	req.onreadystatechange = function() {
		if (req.readyState === 4) {
			if (req.status >= 200 && req.status < 400) {
				data = req.responseText;
				console.log(req.response);
				console.log(JSON.parse(req.responseText));
			}else{
				console.log('Erro!');
			};
		};
	};
};

script.js

var request = new XMLHttpRequest();
request.open('GET', 'https://api.blinktrade.com/api/v1/BRL/ticker', true);
request.setRequestHeader("X-Requested-With", "XMLHttpRequest");
request.onload = function (res) {
	if (request.status >= 200 && request.status < 400) {
		res = request.responseText;
	};
};
request.onerror = function(){
	console.log('Erro!')
};
request.send();