Calculate Google Spending from Chrome Console

google-spending.js

// Google Activity URL: https://pay.google.com/gp/w/u/0/home/activity

// add the id `x-payments-hist` to the tbody 
// containing the payments after viewing
// all records (i.e. it says "No more transactions")

let payments = [];
let rows = document.querySelectorAll("#x-payments-hist > tr");
rows.forEach(function(node) {
    let r = {};
    r.title = node.querySelector("td.b3-widget-table-cell-main-content").textContent;
    r.value = node.querySelector("td.b3-widget-table-cell-numeric span").textContent;
    r.parsed = parseFloat(r.value.split('$')[1]);
    payments.push(r);
});

let totalSpending = payments.map(x => x.parsed).reduce((partialSum, a) => partialSum + a, 0);