Checkout.com said it's raised $450 million in an investment led by Tiger Global Management. : Checkout.com said Tuesday that it had raised $450 million in an investment led by Tiger Global Management — which is also an investor in rival payments giant Stripe — lifting its valuation to $15 billion. That's almost three times the $5.5 billion Checkout.com was worth in a $150 million funding round nearly seven months ago. It also makes Checkout.com the fourth-most valuable privately-held fintech business globally. Checkout.com's platform integrates electronic payments, analytics and fraud monitoring into one platform.