About
Flex builds HSA/FSA payments infrastructure for health and wellness brands, enabling them to accept these funds directly at checkout. Its differentiation is combining payment acceptance with eligibility compliance, subscriptions, and analytics to help merchants improve conversion and recurring revenue.
Market
Flex competes in HSA/FSA commerce and payments, serving health and wellness merchants while also helping consumers discover and purchase eligible products. It positions itself as merchant infrastructure rather than only a retailer, combining APIs, hosted checkout, Shopify and WooCommerce integrations, and eligibility/compliance handling with its own marketplace of more than 1,000 brands. Compared with Truemed and Sika Health in HSA/FSA payment enablement, FSA Store/HSA Store in eligible-product retail, and general processors such as Stripe, Flex differentiates through the combination of merchant integrations and a consumer-facing marketplace.
Flex targets top health and wellness brands, especially enterprise and enterprise DTC merchants with high SKU counts, large transaction volumes, or complex checkout operations. Its likely buyers are e-commerce, payments, and digital-commerce leaders seeking compliant HSA/FSA acceptance and access to consumers' pre-tax spending.
At a Glance
Problem
Middle-market and “super premium” business owners often manage intertwined business and personal finances without the operational support available to large enterprises. Co-mingled expenses, deposits, and payments create accounting-reconciliation problems and cash-flow gaps, while fragmented tools force owners to coordinate payment scheduling, funding sources, invoices, cards, banking, and personal finances across multiple systems. The pain is both administrative and economic: owners lose time, lack visibility into cash flow, and may need to hire or rely on finance staff to manage routine back-office work.
The clearest use case is automating accounts payable and extending working capital. Flex’s AP Automation helps businesses reconcile invoices and automate payment decisions, while its Net-60 credit product gives owners additional float. Together, these products target businesses that need to pay vendors efficiently but may not have an in-house finance team.
Product / Service
Flex is a financial technology platform that brings business finance, payments, credit, banking, expense management, and personal finance into one ecosystem. Its products include AI-powered AP Automation, bill pay, cash-flow analytics, business credit and debit cards, employee expense controls, banking, global payments, invoicing, and receivables. The platform is designed to reduce manual input and let owners manage the full flow from receiving business revenue to spending earnings personally.
Flex’s delivery model is a software-led financial “super app” supported by embedded financial infrastructure rather than a traditional bank. Its business credit card offers 0% interest for 60 days on eligible purchases, with rewards and expense management, while Flex Banking offers yield on idle cash. AI agents and automated workflows handle tasks such as turning invoice-related emails into payments, scheduling vendor payments, and improving financial visibility, allowing owners to replace fragmented systems with a single control layer.
Market
Flex competes in B2B fintech and the broader financial-management or financial-operating-system category for small and middle-market business owners. It is positioned between basic small-business tools and enterprise finance systems, targeting an underserved premium segment that the company describes as overlooked by both B2B-fintech innovators and large incumbent banks. The evidence does not identify named competitors, but the relevant competitive set includes business banking and card platforms, accounts-payable and bill-pay software, expense-management tools, accounting/ERP systems, and incumbent banks offering comparable financial products.
Flex appears to be well beyond pre-revenue: it generates revenue primarily from interchange on its Flex Card and was processing more than $1 billion in annual total payment volume across AP Automation, credit, debit, and B2B payments. The company has launched multiple products, expanded into personal finance, tripled its private-credit offerings, and introduced AI-powered tools; its Net-60 credit card remains a primary customer entry point, with customers often adopting additional products across the broader ecosystem.
Founders & Leadership
Funding History
Y Combinator
Liquid 2 Ventures
Y Combinator, SV Angel, Precursor, Liquid 2 Ventures
First Round Capital, CoreVC, Rethink Impact, Cameron Ventures
Recent News
Flex announced that customers can now file reimbursement claims directly from the Flex Consumer Portal, simplifying the Letter of Medical Necessity process for HSA/FSA spending.
Flex partnered with JOON to help JOON’s employer clients discover and spend pre-tax HSA/FSA dollars on health and wellness products.
The partnership enables eligible athletes to use pre-tax HSA/FSA funds for purchases across Spartan, Tough Mudder, and DEKA.
Equinox partnered with Flex to let members use Health Savings Account and Flexible Spending Account funds toward Equinox memberships.
SHOPLINE integrated Flex so merchants can accept HSA/FSA cards at checkout, with eligible products automatically identified for consumers.
RevenueCat announced an integration with Flex that enables developers to accept HSA and FSA payments for in-app subscriptions.
Flex highlighted support for recurring, compliant HSA/FSA payments across channels, allowing customers to pay with their HSA/FSA cards.
Flex and Silver teamed up to streamline Letters of Medical Necessity, aiming to reduce claim delays and simplify HSA/FSA spending for third-party administrators and consumers.
Flex raised $15 million in Series A funding, co-led by First Round Capital and CoreVC, with participation from Rethink Impact and Cameron Ventures. The round brought Flex’s total capital raised to $18 million and supports its HSA/FSA payments platform.
Active Roles
48Business Model
Flex monetizes a B2B payments-infrastructure offering for health and wellness merchants by enabling HSA/FSA checkout acceptance and providing related compliance and analytics capabilities. The available evidence does not disclose whether fees are subscription-based, transaction-based, or a hybrid.