GoldenPi, a Bengaluru-based online aggregator of bonds and debentures available in the secondary market, announced that it has raised Rs3.5 crore funding from Rainmatter Capital, a fund created by stock trading platform Zerodha to incubate innovative Indian fintech startups. Founded in 2017 by Abhijit Roy and Samir Pratihar, GoldenPi is looking to open up transactions…