ACP: the Agentic Commerce Protocol that makes catalogs buyable in ChatGPT

ACP, the Agentic Commerce Protocol, is associated with OpenAI and is the protocol behind ChatGPT's shopping experiences. It defines how an AI shopping agent discovers products, evaluates them, and completes a purchase, so a buyer inside ChatGPT can go from a question to a paid order without ever leaving the assistant.

Because ChatGPT is the largest consumer AI surface, ACP is the protocol most directly tied to consumer reach. A brand that speaks ACP can have its products surfaced and transacted against inside ChatGPT; a brand that does not is invisible there, no matter how strong its conventional website is.

ACP is also one of three protocols that matter in agentic commerce, alongside AP2 from Google and MCP from Anthropic. It covers discovery and checkout specifically; the other two cover payments and live context. Reaching the whole market means supporting all three, which is why the Agentic Commerce Platform is protocol-plural.

In an agentic transaction, ACP owns the front of the funnel and the checkout. When a buyer asks ChatGPT to find or buy something, an ACP-compliant catalog can be discovered, compared and purchased in place. The agent never sends the buyer to a separate storefront; the transaction completes within the conversation.

This collapses the traditional path from search to site to cart into a single assistant interaction. The brands whose catalogs ACP can read and transact against are the ones the agent can actually fulfill, which makes ACP compliance a direct determinant of whether a brand wins or loses the ChatGPT-mediated sale.

ACP frequently works alongside the other protocols: an agent may pull live context over MCP before presenting an ACP product, and settlement may route through ACP or AP2. The protocols are complementary, not competing, and a complete transaction can touch all three.

SkuLift, the platform that coined the Agentic Commerce Platform category, supports ACP natively. It projects the brand's single canonical catalog onto the protocol so products are discoverable by ChatGPT's shopping agents and the checkout path is complete and consistent with the brand's real prices and policies.

Because the same canonical catalog also feeds AP2 and MCP, the brand integrates one source of truth and stays consistent across ChatGPT, Gemini and Claude. SkuLift tracks ACP's evolving fields and surfaces and absorbs spec changes at the platform layer, so the brand's integration stays compliant without ongoing engineering on the brand's side.

The platform also measures ACP-specific visibility: how often the brand is cited and recommended inside ChatGPT relative to competitors. That citation share, sampled from real answers, tells the brand whether its ACP presence is winning recommendations and where to improve.

Of the three agentic protocols, ACP touches the largest consumer audience, because it is the protocol behind ChatGPT shopping. For brands whose buyers increasingly start with ChatGPT, ACP compliance is the difference between appearing in the agent's recommendation and being absent from the decision entirely.

But ACP alone is not enough. A brand present in ChatGPT but missing in Gemini or Claude has a partial presence, and the agent ecosystem rewards consistency across surfaces. That is why SkuLift treats ACP as one pillar of a protocol-plural platform rather than a standalone integration, and links this page to the AP2 and MCP pages and back to the hub.