Until now, e-commerce sites have been designed to be browsed by a human user via a web or mobile interface.
Tomorrow, an increasing share of the purchasing journey will be delegated to AI agents capable of finding a product, comparing offers, initiating payment, and handling order tracking or returns. This evolution requires rethinking how a merchant exposes its product data, pricing rules, delivery options, and checkout processes. Google’s Universal Commerce Protocol (UCP) embodies this new era: a common language to make an e-commerce site readable, actionable, and transactional by AI agents, not just humans.
Understanding the Universal Commerce Protocol
The Universal Commerce Protocol standardizes interactions between AI agents, merchants, e-commerce platforms, and payment providers. It defines a common language that allows an agent to discover merchant capabilities, manage a shopping cart, and initiate checkout without custom integrations.
Origin and Ambition of the Protocol
The UCP is not just a Google plugin but a proposal for an open standard for agent-driven commerce. Its ambition is to prevent each AI agent from having to build specific connectors for every merchant platform. By defining a unified API, the protocol aims to simplify the discovery of a merchant’s features, from browsing catalogs to managing orders.
At the core of this approach, the goal is to ensure interoperability: a generic agent can interact in the same way with a custom site, a Shopify store, or a marketplace. The promise is to foster competition and innovation by reducing technical complexity.
How an Agentic Session Works
When an AI agent initiates a commerce session via UCP, it starts with a discovery phase: it queries an entry point to learn about the merchant’s capabilities. It can then create or update a cart, apply coupons, select shipping or payment methods, and finally initiate the transaction.
Each step relies on structured exchanges: JSON-LD for product descriptions, REST endpoints for actions, and OAuth authentication mechanisms to prove user consent.
Advantages of UCP for Stakeholders
For AI agents, the benefit is clear: a single integration is enough to interact with multiple merchants. Bot developers avoid heavy maintenance tied to each proprietary API. For merchants, the protocol provides increased visibility on new AI channels and limits lock-in to a specific platform.
By standardizing pricing rules, return policies, and payment methods, UCP also contributes to more reliable agent-driven experiences and reduces frictions that could discourage a buying bot.
Concrete Example: A Swiss SME
A Swiss SME specializing in technical equipment exposed its product data via a UCP-compliant API during an internal pilot. In tests, an AI assistant managed to generate 15% automatic orders in a B2B segment, demonstrating the protocol’s ability to accurately represent complex tiered pricing, loyalty rules, and delivery lead times.
This use case highlights the importance of having a structured product model and real-time inventory management so that AI agents can make reliable decisions and safeguard the customer experience.
The Three Pillars of the Protocol: Capabilities, Extensions and Technical Services
The UCP rests on three conceptual building blocks: capabilities, extensions, and technical services. This modular architecture transforms an e-commerce site into a programmable interface for AI.
Capabilities: Exposing Core Actions
Capabilities are the key functionalities a merchant makes available to an AI agent. They cover identity binding (account creation and authentication), cart management (adding, updating, removing items), checkout (payment selection and finalization), and order tracking.
Each capability is described by a set of webhook events. The agent can thus precisely know the offered capabilities, their parameters, and constraints (min/max quantity, customization options, product variants). The standard also provides dynamic discovery mechanisms to determine if a feature is active or not.
Extensions: Customizing Agent-Driven Journeys
Beyond basic actions, the UCP offers an extension system to handle promotions, coupons, loyalty programs, specific business rules, or additional services (installation, extended warranties).
Each extension is an optional module a merchant can activate. The AI agent queries the extension catalog to find out if any promotions or benefits are applicable. Validity rules, campaign dates, and eligibility criteria are communicated in a standardized way.
Technical Services: API, Agent-to-Agent Protocols and AI Payments
The default service relies on secure REST APIs via OAuth 2.0. But the protocol also provides alternative channels: agent-to-agent communications (Agent2Agent commerce), message queuing for load spikes, and dedicated payment protocols (Agent Payments Protocol, AP2) that facilitate payment method tokenization.
This diversity of services ensures high robustness and flexibility. A merchant can start with a simple REST API, then add an agent broker or AI payment connector as their use cases mature.
Concrete Example: An Organization
An organization modified its custom e-commerce platform to expose capabilities and enable the coupon extension via a UCP-compliant API. The initial launch focused on a B2B discount program, where the AI agent automatically applied negotiated rates based on the customer’s profile.
This pilot demonstrated how easily extensions can be added without overhauling the existing system. The company could assess agent-driven journeys before considering a broader rollout.
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Strategic Impacts: AI Visibility, Risks and Opportunities
Optimizing for AI agents becomes a top priority for retailers and brands. Without structured, reliable data, a merchant risks losing visibility and control in automated shopping journeys.
AI Visibility: Being Understood and Chosen by Agents
Just as SEO aims to make a site visible to search engines, AI visibility means preparing product data and APIs to be discovered and recommended by AI agents. This involves a clean catalog, a product information management (PIM) system or reliable product database, up-to-date pricing, and clear delivery rules.
Only structured, valid, and regularly synchronized data allow agents to make precise decisions. Anomalies (incorrect stock levels, outdated pricing) can lead an agent to exclude a merchant from its comparison set, significantly reducing order volume.
Risks for Unprepared Merchants
An e-commerce site that is not “agent-ready” presents several shortcomings: missing APIs, incomplete product data, non-standardized checkout processes. In such cases, the AI agent may give up on interacting or resort to a third-party marketplace to fill the gaps.
The risk is not only technical: the brand loses control over product discovery and conversion and may face higher commissions from intermediary platforms that translate and interpret its data on its behalf.
Business Opportunities of Agent-Driven Purchasing
For mature e-merchants, adopting UCP opens new sales channels: conversational purchases, integration with AI assistant apps, cross-platform journeys, and automated post-purchase support. Agents can recommend personalized products based on user history and preferences.
In B2B, procurement agents can handle recurring orders for distributors or guide sales reps according to technical or regulatory constraints. These use cases help foster loyalty, speed up transactions, and generate additional business flows.
Concrete Example: A Swiss Retailer
A mid-sized Swiss retailer ran an AI pilot to recommend and automatically reorder professional supplies for its subscription clients. By exposing its tiered pricing and restocking lead times via UCP, the buying agent reduced replenishment time by 20%.
This experiment showed that agent-driven selling could become a competitive differentiator, provided the technical foundation and data are solidly structured.
Getting Ready: Robust E-Commerce Foundation, Architecture and Security
UCP does not replace a robust e-commerce architecture; it attaches to it. Before exposing capabilities, you must structure your catalog, APIs, checkout, security, and consent mechanisms.
Structuring the E-Commerce Foundation
Becoming UCP compliant starts with auditing the product catalog: data integrity, PIM or product database, stock and price synchronization. Delivery rules (zones, lead times, rates) need to be documented and exposed via API, as do return policies.
A headless, modular, and secure checkout is essential to allow agents to initiate payments. It must handle payment tokens, 3D Secure authentication, and real-time transaction status reporting.
Integrating AI Agents into the Architecture
Whether using Shopify, Magento, Medusa.js, WooCommerce, or a custom platform, each solution requires defining the capabilities to expose, the data format, and the agent’s authorization level. It is often wise to deploy an intermediate microservice to route and secure calls between the agent and the merchant backend.
Trust, Security and Consent
Agent-driven purchasing involves sharing sensitive data: addresses, order history, payment methods, loyalty programs. Strong authentication mechanisms (OAuth 2.0, OpenID Connect) and explicit consent are indispensable to prevent misuse or unauthorized actions.
Contractual responsibilities must be clear: who is liable in case of delivery errors, payment disputes, or agent-initiated returns? Clear documentation, audit logs, and dispute resolution processes are prerequisites for trust.
Universal Commerce Protocol: Ready Your E-Commerce for the Agentic Era
UCP is more than a new technical protocol. It’s a signal of a profound shift in online commerce: human interfaces, APIs, and AI agents will need to work together. Structuring your catalog, securing your APIs, and anticipating agent-driven workflows are key to staying competitive.
Our Edana experts can help audit your e-commerce foundation, identify critical data, and design a modular, scalable, and secure architecture. Whether you use an off-the-shelf platform or custom development, we can guide you in integrating AI agents and leveraging the Universal Commerce Protocol.

















