Share via Shortlink From left: Flex’s Shragie Lichtenstein, Piñata’s Lily Liu, NestEgg’s Eachan Fletcher and Till’s David Sullivan As millions of Americans struggle to pay their rent on time, investors are betting on a crop of startups to help landlords get their money. New companies such as Flex, Till and NestEgg have raised cash to put renters on flexible payment plans. Flex and NestEgg have gone as far as fronting monthly payments to landlords. And San Francisco-based rental marketplace Zumper followed suit this summer when it rolled out a rent guarantee for landlords. The companies make money by charging either the landlord or tenant a fee.