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Commerce Agent Protocol

Standardizing AI Agent Interactions for E-commerce

The Commerce Agent Protocol (CAP) is an open standard designed to enable personal AI agents to seamlessly discover and interact with compliant merchants for a complete e-commerce purchase flow. By defining a common language and a set of standardized operations, CAP aims to create an open, interoperable ecosystem for AI-driven commerce.

CAP Main Graphic

Why CAP? The Future of AI-Powered Shopping

CAP empowers AI agents to become capable shopping assistants by addressing key challenges in AI-driven commerce:

  • Simplified Merchant Discovery

    Provides a consistent mechanism for AI agents to find CAP-compliant merchants and understand their e-commerce capabilities through standardized Agent Cards.

  • Interoperable E-commerce Operations

    Defines a clear set of standardized e-commerce operations (e.g., product search, cart management, checkout) with consistent data structures, enabling agents to interact with any compliant merchant reliably.

  • Streamlined Agent Integration

    Lowers the complexity for AI agent developers to integrate e-commerce functionalities by abstracting merchant-specific intricacies behind a uniform set of CAP-defined tasks.

  • Open Commercial Ecosystem

    Fosters a level playing field, enhancing consumer choice by making it easier for AI agents to connect with a diverse range of merchants through an open protocol.

Built on Agent2Agent (A2A) protocol

CAP is a specialization of the Agent2Agent (A2A) Protocol.

CAP builds on A2A Graphic

It leverages A2A's core framework for:

  • Agent discovery (via Agent Cards)
  • Task management
  • Secure communication (JSON-RPC over HTTPS)

CAP then focuses on defining the e-commerce-specific aspects: standardized operations, data structures for commerce, merchant and product discoverability, specific capability declarations, and interaction guidelines.

Learn more about the Agent2Agent (A2A) Protocol

Get Started with CAP

  • Read the Specification

    Dive into the detailed technical definition of the Commerce Agent Protocol.

    CAP Specification

  • View Implementer FAQs

    Find answers to common questions for building Client Agents or Merchant Agents.

    FAQ for Client Agents

    FAQ for Merchant Agents

  • Explore Key Topics

    Learn more about specific aspects of CAP.

    Why A2A

  • Community & Contributions (Future)

    Learn how to contribute to the CAP standard and connect with the community.

Version: draft-01 (See the full Specification Document for detailed versioning and status)