A $28 million financing has made SmartNews, an AI-powered news aggregation app, a unicorn.

Japan Post Capital led the Series E round, which brings the company’s total investment to $116 million and pushes its valuation to $1.1 billion. Existing investors in SmartNews include Development Bank of Japan, SMBC Venture Capital and Japan Co-Invest LP.

The company, founded in Tokyo in 2012, boasts 20 million monthly active users in the U.S. and Japan. Growing at a rate of 500% per year, its audience checks into the app for a mix of political, sports, global and entertainment news curated for each individual reader. To make money, the company sells inline advertising, video ads and deals with publishers to sell ads against “SmartViews,” its equivalent of Google’s AMP or Facebook’s Instant Articles.