HSA/FSA Payment Friction: A $200B Opportunity That's Bigger Than You Think

I was reading through Lindsay Stanley's interview with Tom Griffiths over at CB Insights, and one thing jumped out: the market size numbers for HSAs and FSAs are almost certainly typos. Griffiths says $1B in accounts by 2035 and $500M annual spend—that has to be $1 trillion and $500 billion, given current tallies of $200B in accounts and $100B in annual spend. Even with that correction, though, I think the piece underplays how fragmented the opportunity really is.

Griffiths is right that making it easier for non-healthcare merchants to accept HSA/FSA payments is a real problem. But from where I sit, that's just the tip of the iceberg. PainSignal tracks over 16,450 real operational problems across 74 industries, and healthcare alone accounts for 119 of them—many rated severity 5 out of 5. The kinds of problems we see go way beyond checkout friction.

Take documentation disputes. There's a logged problem where a nurse was placed on unpaid leave because of a blood sugar documentation discrepancy. That's a 5/5 severity issue—someone's livelihood on the line over paperwork. Or alert fatigue from EHR popups: nurses buried under warnings so often they miss real alerts. These aren't HSA/FSA problems per se, but they're part of the same undercurrent: healthcare payment and administration is a mess of compliance, verification, and data transfer issues.

For indie hackers and builders, this means the real opportunity isn't just plugging in HSA/FSA acceptance at checkout. It's building end-to-end solutions that handle the compliance and tracking mess. Think: automated eligibility verification that connects patient purchases back to their HSA/FSA accounts in real-time, with less overhead for merchants. Or tools that help patients track their spending against deductibles and out-of-pocket maximums without digging through paper statements.

PainSignal's data reinforces Griffiths' point about market size. With $200B already sitting in accounts and growing fast, the spending power is enormous. But our data also shows that independent pharmacies, for example, face a 4/5 severity problem with unfair pricing and reimbursement from PBMs. That's a different kind of payment friction—one that affects the supply chain and patient access, not just the moment of purchase.

What makes this interesting from an investment perspective is the ripple effect. Solve HSA/FSA merchant acceptance, and you unlock more spending. But solve the underlying admin burden—the credentialing, the prior authorizations, the documentation nightmares—and you unlock systemic savings. Griffiths is building a piece of that puzzle, but the full picture is much bigger.

If I were building in this space, I'd be looking at how to integrate real-time eligibility with inventory management. Imagine a platform that lets a health store know a customer has remaining HSA funds before they walk in, and automatically tags eligible items. Or a SaaS tool for small health practices that reconciles patient payments against their HSAs and FSAs without manual data entry.

The numbers are there. The pain is documented. And the incumbents are slow. If you're an indie hacker looking for a wedge into healthcare, start with the payment admin layer—it's balky, bureaucratic, and full of high-severity problems just waiting for a better solution.