Custom API

Accept HSA/FSA on any stack. Ship in weeks

Brands using Truemed see 22% higher AOV and 10% higher conversion. Truemed's APIs integrate with any checkout, from Stripe and headless platforms to fully custom builds. OpenAPI spec, full sandbox, and webhooks across the payment lifecycle. No monthly fees.

Trusted by 3,000+ health brands

Heavenly Heat Saunas
Purple
iRestore
Hatch
Tonal
Calm
Barry's
Canyon
Lumebox
Dose
Peloton
Nike Strength
ARMRA
AG1
CrossFit
Sleep Number
Garmin
Eight Sleep
Whoop
HigherDOSE
Get started

Three steps to launch

From kickoff to live HSA/FSA payments on your stack.

Step 1

Kick Off

Sign up to get sandbox credentials and a technical kickoff with Truemed's Solutions team to align on integration approach.

Step 2

Build your Integration

Your team adds HSA/FSA payments to your checkout using the integration pattern that fits your stack. Generate an SDK in any language from our OpenAPI 3.1 spec, plus documentation and engineering support throughout the build.

Step 3

Go Live

Switch from sandbox to production. Your checkout accepts HSA/FSA payments. Truemed is the merchant of record on every transaction, so compliance never sits with you.

Why the Truemed API

Built for HSA/FSA. End to end.

Modular APIs for eligibility, payments, subscriptions, and storefront catalog. Compliance and merchant of record handled by Truemed.

Build on any stack

Direct REST API, embedded iFrame, or Stripe Custom Payment Method if you're already on Stripe. Generate an SDK in any language from our OpenAPI 3.1 spec, plus a full sandbox to build and test against.

Fits into how you already work

Subscriptions, refunds, and cancellations all flow through your existing systems. Your CX and ops teams support HSA/FSA orders the same way they support every other payment method.

We partner on your storefront

Beyond the API, Truemed works with you to make your storefront HSA/FSA-aware. Eligible product collections, PDP widgets, and checkout messaging that surfaces HSA/FSA to improve conversion.

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Results

The impact brands see with Truemed

22%

Average AOV increase with HSA/FSA checkout

10%

Average checkout conversion lift

13%

HSA/FSA revenue sourced by the Truemed marketplace, on average

3K+

Brands partnered with Truemed to unlock HSA/FSA at checkout

Compliance & Trust

Built on healthcare compliance and security

Letter of Medical Necessity

Licensed healthcare providers review each purchase and issue LMNs when appropriate, ensuring compliance with IRS regulations.

Licensed Healthcare Providers

Customers see potential eligibility on your product pages. If needed, they complete a health survey for review by an independent licensed practitioner.

SOC 2 Type II Certified

Your data and your customers' data are protected with industry-leading security standards and regular third-party audits.

Common Questions

Custom API FAQ

Yes. Truemed is the merchant of record on every HSA/FSA transaction, which means full compliance liability sits with Truemed, not your business. Every purchase is reviewed by a licensed independent practitioner who issues a Letter of Medical Necessity when the customer qualifies.

No monthly fees. Truemed charges a per-transaction fee on HSA/FSA orders only. Talk to sales for category-specific pricing.

Custom API integrations typically ship in weeks. Your team gets a full sandbox to build and test against, comprehensive documentation, and an OpenAPI 3.1 spec for generating SDKs in any language. Truemed assigns a solutions engineer to your integration for kickoff, build support, and go-live.

Yes. New subscribers can select HSA/FSA at checkout, and renewals run through your existing subscription system.

Truemed's compliance team conducts a SKU-level compliance review before launch, classifying each product as eligible, eligible-with-LMN, or ineligible.

Can't find what you're looking for? Talk to our sales team.

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Ready to build HSA/FSA into your stack?

Join over 3,000+ brands using Truemed to increase conversion and AOV. Ship in weeks.