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Developer GuideUCP Overview

Universal Commerce Protocol (UCP)

AgentCart is built on the Universal Commerce Protocol (UCP) — an open standard that lets AI agents discover, search, and transact with any e-commerce store.

What UCP defines

  • A manifest at /.well-known/ucp describing a store’s services and capabilities
  • A REST API for catalog search and checkout session management
  • An MCP transport for agents using the Model Context Protocol
  • A checkout session lifecycle: initiated → requires_escalation → completed or failed

Official resources

ResourceURL
UCP GitHub repogithub.com/Universal-Commerce-Protocol/ucp 
Checkout schemaucp.dev/schemas/shopping/checkout.json 
Catalog schemaucp.dev/schemas/shopping/catalog_search.json 

UCP version

AgentCart implements UCP version 2026-01-23. This version string is returned in every API response under the ucp.version field.

How AgentCart relates to UCP

AgentCart is a UCP host — it generates and serves UCP manifests on behalf of merchants. Merchants don’t need to implement UCP themselves; AgentCart handles the protocol layer while connecting to their existing Shopify store.

See How AgentCart Implements UCP for the technical details.

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