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Google will use a new open standard called UCP to power hotel bookings inside AI Mode
Google says in its own developer documentation that it will adopt the new UCP Lodging Booking draft spec, published 25 September on GitHub, to power hotel bookings inside AI Mode over the coming months, with the hotel or booking site staying as merchant of record and its property ranking unaffected.
Image: Search Engine Journal
Why it mattersA hotel or online travel platform that wants direct bookings from inside Google AI Mode now has a specific protocol to implement against, and the same integration is meant to work with other AI surfaces that adopt UCP.
A hotel or online travel platform that wants a booking inside Google's AI Mode now has a specific protocol to implement against. On 25 September the Universal Commerce Protocol project added a draft of its Lodging Booking capability to its GitHub repository, and Google's own developer documentation says the company will adopt this standard for hotel bookings in AI Mode over the coming months. Search Engine Journal reported on the change on 28 September.
What the draft spec covers
Google's FAQ, last updated 24 September, describes UCP for Lodging as an open standard for direct, instant bookings across Google surfaces. The first milestone is Booking: checking availability, previewing a reservation, gathering guest details, and completing a stay for one room. Multiple rooms are listed as a possible future extension. Businesses can integrate through APIs, MCP, or A2A, and the protocol is described as interoperable with AP2 for payments and MCP for tool use.
According to Search Engine Journal, the draft ties into payment extensions for deposits, deferred balances, and split payments from the 25 August release, along with a new extension for cancellation policies. The spec's own draft banner says data models and bindings may still change, with breaking changes possible.
Google's own words on ranking and merchant of record
Google's FAQ states directly that "opting for our booking integration does not influence how we rank your properties or rates in listings." Offers integrated through UCP get the direct booking option in the AI Mode flow, but the ranking of the listing itself is not affected.
The FAQ also says the business remains the merchant of record. That is Google's phrasing: the hotel or booking site retains full ownership of customer relationships, booking data, and the post-stay experience. Google says the API contract exchanges booking, reservation, and transaction lifecycle events, which lets a business tell apart traffic and payments that came through Google's AI surfaces from those that came through its own website or app. Before the final "Book" button is shown, Google says it runs a real-time price and availability check against the partner's API.
Who is behind it, and what came before
The Google announcement acknowledges a Lodging Technical Council of Amadeus, Booking.com, Expedia, Google, Hilton, Marriott, and Trip.com. Google began rolling out hotel bookings in AI Mode for U.S. English users on 27 August 2026, working with ten hotel chains and online travel platforms, according to Search Engine Journal. The new draft is the standard Google plans to adopt for that feature.
A team building for hotel or travel commerce inside AI surfaces now has a first published protocol to test against, rather than a per-vendor integration. The choice a team makes today has to weigh two facts. UCP is a first draft, breaking changes are still possible, and Google has not given a fixed adoption date beyond "over the coming months." A team that waits will get a more stable spec. A team that starts building now will get to shape it, since the announcement points to GitHub as the feedback channel.
Source
This item was written by an AI system from the linked source. Reveneau is responsible for what it publishes.
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