We could not find any statement from Squarespace committing to UCP support, the way Shopify or Adobe Commerce have. Several third-party sites offer to build a UCP or ACP integration for a Squarespace store; we have not verified any of these against Squarespace's own developer documentation, so treat exact implementation claims from unfamiliar vendors with the same skepticism you would apply to any unverified technical claim.
What Squarespace has actually committed to
Per Stripe's own recap of NRF 2026, Squarespace is one of more than 25 partners across the ecosystem who have endorsed the Agentic Commerce Protocol (ACP), the standard developed by OpenAI and Stripe.
That endorsement has a specific, documented shape. Stripe's own newsroom announced on December 11, 2025 that Squarespace is a named ecommerce platform partner in the Agentic Commerce Suite, Stripe's packaged product for getting businesses selling through multiple AI agents with a single integration. The announcement includes a direct quote from Dan Chandre, senior vice president of commercial at Squarespace, describing the Suite as a way for Squarespace merchants to bring their products into AI agents without building that capability themselves.
What the Agentic Commerce Suite actually gives a Squarespace merchant
Per Stripe's own blog post announcing the Suite, the product gives a business a dedicated hosted ACP endpoint, letting it share near real-time product, price, and availability data with AI agents, with minimal changes required to the merchant's existing systems. Stripe frames the Suite as solving a specific problem: without it, a business wanting to be discoverable across multiple AI agents would otherwise need to build and maintain a separate catalog and API integration for each one.
This puts Squarespace in a similar position to Wix: a real, named partnership around ACP, not UCP, with the practical integration work handled by Stripe's own hosted infrastructure rather than something a Squarespace merchant builds from scratch.
The Agentic Commerce Suite launched before ChatGPT's Instant Checkout was retired on March 4, 2026. See our Stripe and Agentic Commerce guide for the full detail on that change. The Suite itself continues, and per Stripe's framing its value is now more about product discovery and feed data across AI agents than about completing a purchase without leaving a chat window.
If you specifically want UCP on Squarespace
Since we found no official UCP integration or commitment from Squarespace, getting a UCP manifest live today would mean custom development. Squarespace does offer a Developer Platform (available on version 7.0, requiring a Business or Commerce plan) for building custom templates with Git-based deployment, plus REST Commerce APIs for reading and writing store data. Neither is documented by Squarespace as a path for serving a file at a fixed /.well-known/ path, so this would be unverified, custom work rather than a supported workflow, similar in spirit to a merchant building UCP on a headless or custom stack elsewhere. For what the manifest actually needs to contain regardless of platform, see our Universal Commerce Protocol guide.
Check what your Squarespace site actually publishes
Whether you build a manifest yourself or are just checking your current setup, verify it directly rather than assuming.
Frequently asked questions
We found no statement from Squarespace committing to UCP support. Per Stripe's own newsroom, its confirmed commitments are endorsing ACP and being a named platform partner in Stripe's Agentic Commerce Suite, neither of which is UCP.
Per Stripe's own newsroom announcement on December 11, 2025, Squarespace is a named ecommerce platform partner, with a direct quote from Squarespace's SVP of Commercial confirming the partnership. The Suite gives Squarespace merchants a hosted ACP endpoint for sharing product, price, and availability data with AI agents.
There is no officially documented path. Squarespace's Developer Platform (custom templates, Git deployment) and REST Commerce APIs exist, but Squarespace does not document either as a way to serve a file at /.well-known/ucp, so this would be unverified custom work rather than a supported workflow.
Yes, per Stripe's own framing. The Suite's value has shifted toward product discovery and feed data across AI agents rather than completing a purchase without leaving a chat window, similar to how ACP's role changed generally after the March 2026 retirement.
Sources
- Stripe Newsroom, "Stripe launches the Agentic Commerce Suite to help every business thrive in the AI-enabled commerce era"
- Stripe, "Introducing the Agentic Commerce Suite: A complete solution for selling on AI agents"
- Stripe, "The three biggest agentic commerce trends from NRF 2026"
- Squarespace Developer Platform, "Enable Developer Mode"
- Digital Commerce 360, "OpenAI shifts checkout plans in its agentic commerce strategy"