May 19 (Reuters) - Pipe, a startup that lets companies sell their recurring revenue streams on its platform, said on Wednesday it had raised $250 million at a valuation of $2 billion. The latest funding round was led by venture capital firm Greenspring Associates, Pipe said. (Reporting by Niket Nishant in Bengaluru; Editing by Aditya Soni) Our Standards: The Thomson Reuters Trust Principles.