Flex is a San Francisco-based provider of a platform that enables health and wellness brands to accept health savings account (HSA) and flexible spending account (FSA) payments. The company offers HSA/FSA payments infrastructure built for omnichannel retailers, integrating into existing tech stacks and handling complexities like recurring payments and mixed-eligibility carts. Flex says it helps businesses generate over $150 billion in pre-tax health spending. Led by CEO Sam O’Keefe, the company intends to use the $15M Series A to scale its team, enhance core platform capabilities, and improve the shopping experience for consumers. The platform targets health and wellness brands and retailers seeking to accept and manage HSA/FSA transactions across channels. Flex integrates with merchant systems to simplify payment acceptance and compliance for tax-advantaged health spending.

Total raised

$15M

Funding rounds

1

Latest round

Series A

Latest activity

Sep 2025