June 9 (Reuters) - Shares of payments startup Marqeta Inc were set to soar in their U.S. stock market debut on Wednesday, giving the company a valuation of nearly $17 billion. At 10:38 a.m. ET, Marqeta’s shares were indicated to open at $32 compared to its IPO price of $27 per share. (Reporting by Sohini Podder in Bengaluru) Our Standards: The Thomson Reuters Trust Principles.