Quick commerce platform Zepto has raised $665 million in a funding round that was co-led by existing investors Glade Brook, Nexus, and StepStone, along with Goodwater and Lachy Groom. New investors such as Avenir, Lightspeed, and Avra Capital also participated in a round that pegged the valuation of the unicorn at $3.6 billion, the company said in a press statement.