MCP vs ACP: the two protocols behind agentic commerce (and which one your store needs first)
If you've read anything about agentic commerce this year, you've met two acronyms that sound interchangeable and aren't. MCP is the standard that lets an AI assistant load a business's tools and do real work, and it's how an assistant can run your store. ACP is the standard that lets an AI agent complete a purchase, and it's how a shopper's assistant will buy from your store. One moves actions, the other moves money. This post keeps them straight and tells you which one you can actually act on today.
The agentic commerce wave arrived with a pile of new vocabulary, but most of it hangs off two protocols. Merchants keep asking us some version of the same question: are MCP and ACP competitors? Do I have to pick? The short answer is that they're different layers of the same shift, they'll almost certainly both touch your store, and only one of them is something you can switch on this afternoon.
MCP, in plain language
MCP stands for Model Context Protocol. It was released as an open standard by Anthropic in late 2024 and has since been adopted across the major assistants. It defines how an AI assistant connects to outside systems: what tools a business exposes, how the assistant discovers them, and how it calls them safely.
The browser comparison is the easiest way to hold it. A browser can load any website because the web agreed on shared standards. MCP does that for AI assistants and tools: any assistant that speaks MCP can load any business's MCP connector and use its tools, without a custom integration for each pairing.
What that looks like for a merchant is concrete. When you add a store-management connector to Claude, ChatGPT, or Perplexity, the assistant gains real capabilities against your account: design a product, create the listing, sync it to your channels, check an order, pull last month's numbers. The assistant stops being a very well-read intern and becomes one with hands.
The important detail: MCP work happens on your side of the counter. It's your assistant, signed into your account, doing your operational work with your approval. Nobody else's money moves.
ACP, in plain language
ACP stands for Agentic Commerce Protocol. It's an open standard co-developed by OpenAI and Stripe, launched in late September 2025 alongside Instant Checkout in ChatGPT, and it defines how an AI agent completes a purchase from a merchant on a shopper's behalf.
The clever part is how it handles trust. When a shopper confirms a purchase, Stripe issues a Shared Payment Token: a one-time credential scoped to that specific merchant and that exact cart total. The agent never sees the shopper's real card, and the merchant stays in control of the catalog, the brand, and fulfillment. Instant Checkout started narrow, with single-item purchases from US Etsy sellers, with Shopify merchants and multi-item carts on the announced roadmap.
ACP didn't arrive alone. Visa launched Intelligent Commerce and Mastercard launched Agent Pay in the same week in April 2025, both building payment rails for agent-initiated transactions. We walked through that whole wave in the Agentic Commerce Protocol, explained, and the takeaway stands: when the payment networks all ship for the same idea in the same year, it's plumbing, not speculation.
ACP work happens on the shopper's side of the counter. It's the buyer's agent, spending the buyer's money, inside guardrails the payment industry designed.
The table to keep them straight
| MCP | ACP | |
|---|---|---|
| Stands for | Model Context Protocol | Agentic Commerce Protocol |
| Created by | Anthropic (open standard, late 2024) | OpenAI and Stripe (open standard, late 2025) |
| What it standardizes | How an AI assistant connects to tools and takes actions | How an AI agent completes a purchase from a merchant |
| What moves | Work: listings, syncs, orders, reports | Money: a scoped, one-time payment credential |
| Whose agent | Yours, signed into your accounts | The shopper's, spending their money |
| Where you meet it today | Assistant connectors (Claude, ChatGPT, Perplexity) | Instant Checkout in ChatGPT, expanding by category |
| What a merchant does about it | Add a connector and start delegating operations | Keep catalog data clean so agent checkout can reach you |
Layers, not rivals
Here's the same future purchase, told once, with both protocols doing their jobs.
Months earlier, you told your assistant to design a summer collection and list it across your storefront and marketplaces. That was MCP: your assistant using your store-management tools to create the products, set the prices, and sync the listings, with you approving the calls that mattered.
Today, a shopper tells their assistant to find a tee like the one their friend wore. Their agent surfaces yours, the shopper says buy it, and the agent completes checkout with a scoped payment token. That's ACP: the transaction layer, moving the money safely.
Notice what both stories depend on: a clean, well-structured, multi-channel catalog. The buyer's agent can only transact with products that exist, with accurate variants and prices, on channels it can reach. And the fastest way to keep a catalog in that state is, increasingly, the MCP side: an assistant that maintains your listings for you. The two protocols don't just coexist. One feeds the other.
Which one your store needs first
The honest answer: MCP is actionable today, ACP mostly isn't yet, and preparing for ACP is best done with MCP.
You can't install ACP. It arrives through your sales channels and payment providers as agent checkout expands to your category, and when it does, it'll reach you through platforms you already use. Your preparation is indirect: be present on the channels agents shop, with catalog data an agent can trust. That's the advice from our ACP deep dive, and it hasn't changed.
MCP, on the other hand, is a setting you can turn on this afternoon. ApparelHub ships a hosted connector at https://mcp.apparelhub.ai: add it to your assistant, sign in, approve, and you're delegating real store operations a minute later. We wrote up what that unlocks in ecommerce AI management, explained, and there are step-by-step guides for Claude, ChatGPT, and Gemini.
So if you're deciding where to spend an afternoon: connect your assistant, hand it the catalog work, and let it keep your listings agent-ready. When ACP reaches your category, the stores that win will be the ones whose products were already there, already clean, already everywhere. The assistants that got them that way will have been working over MCP the whole time.
Sources: the Model Context Protocol was released as an open standard by Anthropic in November 2024; the Agentic Commerce Protocol is maintained by OpenAI and Stripe (Apache 2.0), launched with Instant Checkout in ChatGPT in September 2025; Visa announced Intelligent Commerce and Mastercard announced Agent Pay in late April 2025.