gistfile1.txt

// XHR

const btnXHR = document.querySelector('#btnXHR')

btnXHR.addEventListener('click', function() {
    let XHR = new XMLHttpRequest()
    XHR.onreadystatechange = function() {
        if (XHR.readyState == 4 && XHR.status == 200) {
            PRICE.textContent = JSON.parse(XHR.responseText).bpi.USD.rate + ' USD'
        }
    }
    XHR.open('GET', API)
    XHR.send()
})