金融庁 RSSフィード has no RSS feed of its own. Feeder builds one from https://www.fsa.go.jp/kouhou/rss.html#RSSURL and updates it as the page changes. Follow it in Feeder to get the posts.
Yes. Feeder checked it about 17 hours ago and the feed answered normally.
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Feeder's free plan covers up to 200 feeds, on the web, iPhone and Android. No credit card required.