On 16 October 2026 Vercel made its Vercel Shop storefront template for Shopify, and Shopify's rebuilt Hydrogen SDK, generally available. Underneath sits the Universal Commerce Protocol (UCP), which Shopify co-developed. In Vercel's words, it "gives agents a standard way to search a store's catalog, read product details, check availability, build a cart, and get a checkout link."
That raises a practical question for any store with more than one price list: when an AI agent asks for a price, which price does it get?
The protocol has the parts
It would be easy to assume a new protocol simply hasn't thought about trade pricing. UCP has. Its specification includes an identity linking capability, which lets an agent act on behalf of a signed-in customer. The spec describes this as "foundational for user-authenticated commerce experiences: accessing loyalty benefits, personalized offers, saved addresses, wishlists, and order history."
There is also a discount extension, including "eligibility claims" for things like loyalty membership. And the identity-linking page includes a worked profile for a B2B wholesaler: "No guest checkout — every transaction requires an authenticated user".
What it leaves to each store
What the protocol doesn't do is decide anyone's prices. The same section is explicit:
"Whether the user is B2B-eligible, what pricing they see, what payment terms apply — those are user attributes the merchant resolves at runtime, not additional scopes."
And identity is optional by design: "Capabilities without identity linking still operate at public or agent-authenticated access levels — identity linking upgrades the experience, it does not gate it."
Put those together and the answer to "which price does the agent see?" is: whichever price your store returns to an agent that hasn't signed anyone in. Note what the spec's B2B wholesaler example actually restricts: it requires sign-in for checkout operations, while catalogue access isn't listed among the gated scopes.
Questions to settle before agents shop your store
- What does an anonymous agent see? List price, a starting-from price, or nothing until someone signs in? It's a decision, so make it on purpose.
- Do trade prices appear only after sign-in? If you have wholesale or negotiated pricing, confirm it's attached to the signed-in customer and not visible on the public catalogue.
- Is checkout gated where it should be? The spec's B2B example requires sign-in for checkout; its B2C example doesn't.
- Do loyalty discounts show correctly? Under the discount extension, a store that accepts eligibility claims has to show their effect as provisional discounts the agent displays to the buyer.
None of this is a flaw in the protocol. It's a split of responsibilities: the protocol carries the price precisely, and each store decides what that price should be for whoever is asking.
Sources: Vercel, "Vercel and Shopify make agents first-class shoppers" (16 October 2026); Universal Commerce Protocol specification: identity linking, discount extension and overview. All read 18 October 2026.