Where the buyer pays, which feed or protocol you need, and how to opt in, for each major AI shopping surface. Last updated Oct 17, 2026.
The Atlantic recently asked readers to “Imagine Every AI Agent on Earth Buying the Same Cheap Paper Towels”: if agents shop for millions of people, they could all pile onto the same cheapest products. The way out for merchants is to be understandable: clear product data, the right feed for each agent, and a checkout agents can reach. This page shows where each one sends the buyer to pay. Pair it with our AI-ready checklist.
| Agent / platform | Where the buyer pays | Feed / protocol needed | Opt-in steps | Sources |
|---|---|---|---|---|
| ChatGPT (OpenAI) | On your own site or app. OpenAI says it is moving away from standalone in-chat Instant Checkout toward merchant-owned checkout. | Product feed via the Agentic Commerce Protocol (ACP), shared through systems or supported providers you already use. | Shopify: set up the ChatGPT agentic storefront (see Shopify Help). Others: apply via OpenAI's merchant page or a supported feed provider. | ChatGPT for merchants Shopify Help: Selling on ChatGPT |
| Google Universal Cart (Search AI Mode, Gemini) | Native checkout inside AI Mode in Google Search and Gemini; you stay merchant of record. Universal Cart lets shoppers combine products from multiple retailers (rolling out in the US). | Universal Commerce Protocol (UCP), using your existing Google Merchant Center shopping feeds. | Keep your Merchant Center feed accurate, then integrate UCP per Google's merchant docs (or through your platform's Google channel). | Google: UCP for merchants @NewsFromGoogle: Universal Cart rollout |
| Microsoft Copilot Checkout | Inside Copilot (Copilot Checkout), now on mobile apps too. The Keyword reports it covers 500,000+ US merchants. | UCP feeds: merchants already on UCP can surface in Copilot without a separate integration. | If you already publish a UCP feed, check Copilot eligibility; otherwise start with your platform's UCP/feed options. | The Keyword: Microsoft adds UCP feed support |
| Shopify: Shop MCP & agentic storefronts | Shop Pay. With Shop MCP, an agent (e.g. ChatGPT, Claude) builds the cart and completes Shop Pay checkout after the shopper confirms the total and payment method. | Shopify Catalog (1B+ products per Shopify). Agentic storefronts support D2C only: B2B/wholesale-only products are automatically excluded when Shopify can identify them. | Shopify merchants: set up agentic storefronts from your admin (see Shopify Help). Non-Shopify brands: Shopify's Agentic plan lets you set up agentic storefronts and keep your existing online store. | Shopify changelog: Shop MCP Shopify Help: Catalog & B2B exclusions Shopify Help: Agentic storefronts |
| WooCommerce | Depends on the agent: via Stripe's Agentic Commerce Suite, shoppers either check out inside the agent or are sent to your store. | WooCommerce MCP (shipped in 10.3, early release) is for store management by AI assistants, not shopper checkout. Shopper-facing: ACP/UCP via Stripe Agentic Commerce Suite (rolling out to US businesses). | Follow WooCommerce's 'selling through AI' guide; check Stripe Agentic Commerce Suite availability for your account. | WooCommerce: From found to bought |
| BigCommerce | Not specified on BigCommerce's page; varies by agent and integration. | B2C Storefront MCP and B2B Storefront MCP (listed as now available); Store Management MCP and B2B PO Skill (early access). | See BigCommerce's agentic commerce page and developer docs; early-access items need sign-up via AI Labs. | BigCommerce: Agentic commerce |
Only what the linked sources say; this changes fast. Spot something out of date? Tell us.
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