Flex vs Visa
Side-by-side comparison of AI visibility scores, market position, and capabilities
US YC S23 HSA/FSA payment infrastructure for DTC health brands; $18M total ($15M First Round/Core VC Series A Sep 2025 + $3.2M seed) enabling Stripe-like online pre-tax health spending competing with Truemed for $150B HSA/FSA market.
About
Flex is a United States-based HSA/FSA payment infrastructure platform — backed by Y Combinator (S23) with $18 million in total funding including a $3.2 million seed in September 2024 from Y Combinator, SV Angel, Precursor Ventures, and Liquid 2 Ventures, plus a $15 million Series A in September 2025 led by First Round Capital and Core VC with Cameron Ventures, Rethink Impact, and Y Combinator — providing direct-to-consumer health and wellness brands with Stripe-like payment processing infrastructure that enables online acceptance of HSA (Health Savings Account) and FSA (Flexible Spending Account) funds from the $150+ billion annual pre-tax healthcare spending market. Founded in 2023 by Sam O'Keefe and Miguel Toledo, Flex targets the DTC health and wellness brands that cannot currently accept HSA/FSA payments online because of technical and compliance barriers.
NYSE: V global payments network at $35.93B FY2024 revenue with 4.48B cards and $15T+ annual volume; 52.2% credit card market share with 233.8B transactions competing with Mastercard and A2A payment rails.
About
Visa Inc. is a San Francisco-based global payments technology company — listed on NYSE (NYSE: V) — operating the world's largest electronic payment network connecting 4.48 billion active cards, 150+ million merchant locations, and 15,000+ financial institution partners across 200+ countries and territories, facilitating $15+ trillion in payment volume annually. Visa generated $35.93 billion in net revenues in fiscal year 2024 (+10% year-over-year) with $19.7 billion in net income (55% net margin) from payment volume fees, data processing fees, and international transaction fees — without issuing a single credit card or carrying any credit risk. Founded in 1958 as the BankAmericard program and reorganized as Visa Inc. through a 2008 IPO, Visa is the infrastructure provider that enables the global credit and debit card ecosystem to function: every Visa card issued by Citibank, Chase, HDFC, or 15,000 other banks worldwide runs on Visa's authorization, clearing, and settlement network.
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