If you are looking for a simple and free alternative to Google Feed API for your rss widget then rss2json.com could be a suitable solution for that.
You may try to see how it works on a sample code from the api documentation below:
google.load("feeds", "1"); function initialize() { var feed = new google.feeds.Feed("https://news.ycombinator.com/rss"); feed.load(function(result) { if (!result.error) { var container = document.getElementById("feed"); for (var i = 0; i < result.feed.entries.length; i++) { var entry = result.feed.entries[i]; var div = document.createElement("div"); div.appendChild(document.createTextNode(entry.title)); container.appendChild(div); } } }); } google.setOnLoadCallback(initialize);<html><head> <script src="https://rss2json.com/gfapi.js"></script></head><body><p><b>Result from the API:</b></p><div id="feed"></div></body></html>