When you land on piie.com, you're visiting the home of the Peterson Institute for International Economics, a well-known nonprofit think tank. Unlike a random e-commerce store or an unknown startup, this site has been online since 1997, and the Internet Archive has snapshots going back nearly as long. That kind of continuous presence is a strong signal that the organization is real and established.
For a nonprofit research site, the key checks are about transparency and security. Piie.com passes both: it has an About page naming the team, a privacy policy and terms of service, and valid contact details. Security headers are properly configured, and the site has never appeared on Google's Safe Browsing list. There's no scam angle here. Piie.com reviews from users aren't abundant because it's a policy resource, not a consumer product, but the technical signals overwhelmingly support its legitimacy. If you're using it for research or analysis, there's no reason to doubt it.