FastMCP

We used to optimize APIs for speed and human readability. For decades, the goal was to build systems that a frontend developer could "figure out" by reading documentation or through trial and error. But the landscape has shifted. Now that the user is increasingly an AI agent, we need an architecture that provides absolute clarity from the first request.

In 2025, Shopify didn’t just hold its ground. Recognized by Gartner as a leader with the "highest ability to execute" among digital commerce platforms, Shopify continued to innovate with AI-driven features that redefine how brands sell online. What once felt like early experimentation with automation has now become the new baseline. AI assistants are no longer just augmenting the shopping experience – they are driving it.

As soon as OpenAI and Stripe released the Agentic Commerce Protocol (ACP), we wanted to see what it would actually take to implement it. This post breaks down how ACP works, how we built the required endpoints in Nimara Storefront, the challenges we ran into, and what we think about implementing it at this early stage.