Checkout.com This story is available exclusively to Insider subscribers. Become an Insider and start reading now. Payments startup Checkout.com is now Europe's most valuable startup after raising $450 million at a $15 billion valuation. It is almost the fourth most valuable fintech globally. The Series C was led by hedge fund giant Tiger Global Management amid a boom in interest in fintech startups from the private equity world. Checkout.com powers online payments for merchants like food delivery unicorn Deliveroo and fintech TransferWise among others. Payments firm Checkout.com is now Europe's most valuable startup after raising $450 million at a $15 billion valuation.