The Central Bank powered serch engine may come here. Idea Big Data analytics and combating web spam with trust rank. Apriori, Central banks links to authorative sites and articles.
So why not make a search engine that crawls n levels deep from Central Bank sites? You can choose n. The smaller n is, "ceteris paribus" the more reliable should the SERPs be . So if n = 0, the SERPs should only include Central Bank articles and information. If you follow that idea and make the search engine, please quote this site.