UCPStoreDocs
Getting Started

Introduction

Welcome to the Universal Commerce Protocol (UCP) - the open standard enabling seamless interoperability between AI agents, platforms, and businesses.

What is UCP?

The Universal Commerce Protocol (UCP) is an open-source, standards-based protocol enabling seamless interoperability between diverse commerce entities in an increasingly agentic and distributed landscape. Version 2026-01-11 is the current specification.

Think of UCP as the "HTTP of commerce" - just as HTTP standardized web communication, UCP standardizes commerce operations across all participants in the ecosystem.

Endorsed By

Google, Shopify, Etsy, Wayfair, Target, Walmart, Adyen, American Express, Best Buy, Block, Capital One Shopping, Checkout.com, Klarna, Mastercard, PayPal, Stripe, Visa, and more.

Key Principles

Standardized Interoperability

Uniform way for platforms to interact regardless of backend systems

Modular Architecture

Distinct Capabilities (core) and Extensions (optional augmentations)

Agentic Commerce

Designed for AI agents acting autonomously on behalf of users

Security & Compliance

Built on OAuth 2.0, cryptographic proofs, and PCI-DSS patterns

Core Components

Capabilities

Fundamental building blocks that define core commerce operations. Every UCP-compatible system must support these.

  • Checkout - Create and complete purchase sessions
  • Identity Linking - OAuth 2.0 user authorization
  • Order - Lifecycle management and tracking

Extensions

Optional augmentations that add specialized functionality.

  • Fulfillment - Shipping, pickup, delivery options
  • Discount - Promotional codes and automatic discounts
  • AP2 Mandates - Cryptographic authorization proofs
  • Buyer Consent - Privacy compliance (GDPR, CCPA)

Transports

Communication protocols for different integration scenarios.

  • REST - HTTP/HTTPS primary transport
  • MCP - Model Context Protocol for LLMs
  • A2A - Agent-to-Agent communication
  • Embedded - iframe/webview integration

Integration Paths

For Businesses

Expose your store to AI agents

For Platforms

Discover and consume UCP endpoints

For AI Agents

Enable autonomous commerce

Next Steps

Ready to dive in? Start with the Protocol Overview to understand the architecture, or jump directly to Capabilities to learn about core commerce operations.

Protocol Overview
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