If you built a custom smart-home setup using SmartThings and Home Assistant, Samsung has an invoice arriving in October.
The company announced this month that non-commercial, individual developers will need to pay $4.99 a month for access to the SmartThings API beginning in October 2026. Access remains free through the end of Q3. The announcement, reported by Engadget, covers anyone using the API to build custom integrations, connect third-party platforms, or automate their smart-home devices outside the official SmartThings app.
What Samsung has not published: the actual rate limits, API call caps, or a clear definition of which usage level triggers the paid plan. The company says it is launching a new API Dashboard in the Developer Center so developers can monitor their own usage, which is a reasonable tool to offer. Less reasonable is asking developers to commit to a recurring fee before telling them what usage level they are committing to staying under. The thresholds, as of the announcement date, remain undefined.
Samsung’s stated justification is to “invest heavily in enterprise-grade features” and support the “next generation of smart home innovation at scale.” The company says the fee will fund enterprise-grade reliability for high-volume commercial deployments. That framing is aimed at commercial integrators. The $4.99 personal plan, though, is aimed at the hobbyist who set up an automation to turn the lights off when they leave home.
The response from the Home Assistant community, which is among the most directly affected, was not warm. Paulus Schoutsen, the founder of Home Assistant, said the integration “will be affected” and that the team was “disappointed” at the move. Home Assistant has millions of users worldwide running self-hosted smart-home software; a significant portion of them rely on the SmartThings API to connect Samsung-ecosystem devices. Those users will now need to decide whether to absorb the cost themselves, wait and see how Home Assistant responds, or replace their Samsung devices entirely.
The competitive context makes Samsung’s decision look more isolated than strategic. Google’s Home API is free for personal use. Amazon’s Alexa developer program does not charge individual users. Apple’s HomeKit integration model carries no recurring API fee. Samsung is, as of this announcement, the first major smart-home platform to put a paywall on individual developer access. The company’s rivals have not followed, which leaves Samsung either ahead of an industry shift or alone in a decision that pushes its most technically engaged users toward alternatives.
The practical consequences depend on what Home Assistant and other third-party platforms decide to do. The options are limited: absorb the costs on behalf of users, require users to provide their own API credentials and pay individually, make the SmartThings integration an optional paid add-on, or drop support. Home Assistant has not announced a path yet. The decision will be shaped by how many of its users are affected and whether Samsung publishes the rate limits before October makes the question urgent.
The broader concern in the open-source smart-home community is about precedent. Smart-home hardware is sold once. The value proposition for a platform like SmartThings has always been that the ecosystem around the hardware remains open to developers who extend it. A recurring API fee shifts that model toward something closer to software-as-a-service, where the hardware you bought is a gateway to a subscription the manufacturer controls. If Samsung holds this position and it generates revenue without significant user defection, the incentive for other manufacturers to follow is real. Google, Amazon, and Apple keeping their APIs free is the current competitive pressure against that outcome. Whether it holds is not yet clear.
Several questions Samsung has not answered: whether Matter-protocol devices, which can bypass proprietary APIs entirely, will be treated differently under the new pricing; whether open-source or nonprofit integrations receive any exemption; and whether commercial tier pricing for business partners and enterprise integrators will be disclosed before the October transition date.
The free window runs through September 30. That is the deadline by which developers will need to understand what they are being charged for, or Samsung will need to tell them.
