The Agentic Commerce Protocol (ACP) is an open standard, introduced by Stripe and OpenAI in 2025, that lets AI agents complete purchases directly inside a chat interface using structured, machine-readable checkout data. Instead of every retailer building a custom integration for every AI platform, ACP gives merchants and AI agents a shared language for product listings, cart updates, and payment authorization.
Key Takeaways
- ACP is an open-source protocol introduced by Stripe and OpenAI in 2025.
- It standardizes how AI agents read product data and complete checkout on a merchant’s behalf.
- ChatGPT’s Instant Checkout was the first major consumer feature built on ACP.
- Merchants publish a structured product feed so agents can evaluate and buy without custom code per platform.
- ACP is positioned as a shared standard rather than a single company’s proprietary system.
Why ACP Was Created
Before ACP, any retailer wanting an AI agent to complete a purchase needed a custom integration with each AI platform individually. That approach doesn’t scale as more agents enter the market. ACP solves this by giving merchants one protocol to implement instead of many.
How the Protocol Works
Merchants expose a structured feed of product data, pricing, and availability. An AI agent reads that feed, builds a cart based on the shopper’s stated goal, and requests payment authorization through a standardized checkout flow rather than scraping a webpage or guessing at form fields.
ChatGPT’s Instant Checkout Runs on ACP
OpenAI’s Instant Checkout feature inside ChatGPT was the first major consumer-facing implementation built on the protocol, allowing shoppers to complete a purchase without leaving the chat window. Other platforms are expected to adopt the same standard rather than build competing formats.
What This Means for Merchants
Retailers preparing for agentic commerce need structured, accurate product feeds more than persuasive marketing copy, since an agent evaluates listings on data completeness and accuracy. Getting product data in order now positions a store to plug into ACP-based checkout as adoption grows.
Agentic Commerce Protocol at a Glance
| Aspect | Without ACP | With ACP |
|---|---|---|
| Integration | Custom build per AI platform | One standardized protocol |
| Product data | Scraped from web pages | Structured, machine-readable feed |
| Checkout | Agent redirects to site checkout | Checkout completes inside the chat interface |
| Adoption | Fragmented across platforms | Shared open standard |
Common Mistakes When Approaching ACP
- Assuming it’s proprietary to one company. ACP is designed as an open standard other platforms can adopt.
- Waiting for full-scale adoption before preparing. Structured product data pays off regardless of which specific protocol wins out.
- Treating it as identical to a payment gateway. ACP covers product discovery and cart building, not just the payment step.
Expert Insight
Retailers that treat structured data as a core infrastructure investment, not a one-time task, will be better positioned as more AI platforms build on protocols like ACP. The underlying skill, clean and complete product data, transfers regardless of which standard ultimately dominates.
Frequently Asked Questions
Who created the Agentic Commerce Protocol?
Stripe and OpenAI introduced ACP in 2025 as an open standard for AI-driven checkout.
Is ACP the same as ChatGPT’s Instant Checkout?
No, Instant Checkout is a feature built on top of the ACP standard, not the protocol itself.
Do merchants need special software to support ACP?
Merchants need to expose a structured, machine-readable product feed that follows the protocol’s format, which typically requires updating existing product data pipelines.
Will other AI platforms adopt ACP?
ACP is designed as an open standard, so it’s positioned for wider adoption beyond its original implementation in ChatGPT.
Conclusion
The Agentic Commerce Protocol gives merchants and AI agents a shared standard for checkout, and structured product data is the foundation for using it. For related context, see what agentic commerce is, review how AI is changing online shopping, or read the best AI tools for e-commerce businesses for more.
How ACP Fits Into the Broader Checkout Ecosystem
Rather than replacing existing payment infrastructure, ACP is designed to work alongside it, giving AI agents a standardized way to communicate with a merchant’s existing checkout systems instead of requiring custom integrations for every retailer an agent might interact with.
What Merchants Should Watch For
As adoption grows, merchants that support standardized protocols like ACP are more likely to appear as viable options when an AI agent completes a purchase on a shopper’s behalf. Merchants that don’t support these protocols risk being excluded from an increasingly common way people shop, even if their traditional website works fine.
Security Considerations for Agent-Led Checkout
Handing checkout authority to an AI agent raises legitimate questions about fraud and authorization. Protocols like ACP are built with permission boundaries and authentication steps designed to ensure an agent can only complete purchases within limits the shopper has explicitly approved, similar to how a stored payment method works today.
Is ACP the Only Protocol to Watch?
ACP is one of the most visible efforts, but it’s part of a broader push toward standardized agentic commerce infrastructure. Merchants should expect the landscape to keep evolving, and staying flexible enough to support new protocols as they emerge is likely more valuable than betting on a single standard permanently.
