What is Agentic Commerce Protocol (ACP)? A Complete Guide for 2026
The Agentic Commerce Protocol (ACP) is an open standard that allows AI agents to discover products, manage shopping carts as well as make secure transactions, autonomously, on behalf of buyers. It establishes how AI systems and seller platforms communicate to carry out a commercial workflow, eliminating the need for manual browsing.
Open AI and Stripe co-developed the ACP, aiming to make it possible for an AI assistant to directly execute secure purchases, adhering to consent boundaries, instead of merely answering a shopping question.
Agentic commerce refers to AI systems executing purchases on behalf of users. ACP provides the technical framework that makes those transactions secure, interoperable, and machine-readable.
TL;DR
- ACP is a standard for AI agent-merchant commerce interactions
- It structures product discovery, cart management, and checkouts
- It relies on secure authentication and payment tokenisation
- It supports machine to machine transactions rather than human interface flows
- It is intended to enable autonomous purchasing within user approved limits
- Agentic commerce is a commerce model in which AI agents execute transactions, while Agentic Commerce Protocol (ACP) is a proposed standard that enables structured and interoperable implementations of that model.
What is the purpose of the Agentic Commerce Protocol?
ACP standardises AI agent-merchant commerce interactions.
The existence of a shared protocol as such helps to avoid the requirement of each AI platform to have custom integrations for every merchant.
ACP establishes a consistent structure for:
- Querying product catalogs
- Creating and updating carts
- Initiating checkout
- Handling payment authorisation
- Relaying order confirmation information
How Agentic Commerce Protocol Works
ACP sequences structured, consent-based communications between the user and merchant via the AI agent.
As a customer, you can simply ask, “please help me find a comfortable, all-weather jacket? Preferable light coloured and under ₹1000”. This will prompt the AI agents to browse the web for suggestions that it’ll then present to you. You can then add the product you like to your cart and further initiate a checkout.
Transactional life-cycle
1. Structured Product Discovery
Merchants integrate endpoints readable to AI agents. This allows the agents to retrieve information regarding -
- Products
- Prices
- Stock
- Shipping
2. Cart Object Creation
The AI agent:
- Creates a cart session
- Adds selected items
- Updates quantities
- Validates pricing
The cart objects follow predefined data models to ensure consistency across merchants.
3. Checkout Initiation
The ACP defines structured checkout requests that include:
- Cart ID
- Shipping details
- Tax calculations
- Authorisation references
This eliminates the dependence on human-facing web forms.
4. Authentication and Authorisation
Transactions as such require secure authentication mechanisms. These typically include:
- Token-based authentication
- User consent verification
- Session validation
Invalid authorisation credentials prevent the processing of transactions.
5. Payment Handling
ACP supports secure payment workflows through:
- Tokenised payment methods
- Third-party payment processor integration
- Confirmation-based execution
The protocol avoids direct exposure of raw payment credentials.
6. Order Confirmation
After the payment is approved, the merchant sends back:
- Order identifier
- Fulfillment status
- Delivery estimates
- Tracking references
The responses follow defined schemas to ensure compatibility.
Agentic Commerce Protocol vs Agentic Commerce
Although related, these terms describe different layers.
Agentic commerce is a commerce model in which AI systems execute purchases on behalf of users within defined permission boundaries.
Agentic Commerce Protocol is the technical standard that enables those transactions to occur in a secure and structured way.
Differences
| Agentic Commerce | Agentic Commerce Protocol |
|---|---|
| A commerce mode | A technical interaction standard |
| Describes AI executing purchases | Defines how AI executes purchases |
| Focuses on user intent delegation | Focuses on API schemas and transaction flows |
| Strategic shift in buying behavior | Operational framework for implementation |
Dependency and Relationship
Agentic commerce can exist conceptually without a formal protocol.
However, scalable and interoperable agent-driven transactions require a standardised interaction model. ACP provides that structured foundation.
In short:
- Agentic commerce is the model.
- Agentic Commerce Protocol is the mechanism.
Key Technical Components
ACP implementations typically include:
Standardised Schemas
Defined object structures for products, carts, checkout requests, and order responses.
Secure API Endpoints
Dedicated endpoints for AI agent interaction, separate from traditional front-end flows.
Consent Controls
Explicit mechanisms to verify that the AI agent is authorised to act on behalf of the user.
Error Handling Standards
Consistent status codes and response structures to support reliable automation.
Audit and Logging Support
Transaction traceability for compliance and dispute resolution.
ACP Compared to Traditional Commerce APIs
| Traditional Commerce APIs | Agentic Commerce Protocol |
|---|---|
| Designed for websites and apps | Designed for AI agents |
| Human interface dependent | Machine-to-machine interaction |
| Form-based checkout | Structured checkout requests |
| Merchant-specific patterns | Standardised transaction model |
ACP focuses specifically on autonomous, structured execution rather than front-end rendering.
What are the Benefits of Agentic Commerce Protocol
- Interoperability - A single AI agent can interact with multiple merchants using the same transaction logic.
- Reduced Integration Complexity - Merchants implement one standardised framework instead of multiple custom integrations.
- Security - Authentication, tokenisation, and authorisation are embedded into the protocol design.
- Scalability - Machine-readable commerce flows allow automated systems to operate reliably at scale.
What do Merchants Require for ACP?
To support ACP, merchants typically need:
- Structured product catalog APIs
- Cart and checkout endpoints accessible programmatically
- Secure authentication infrastructure
- Tokenised payment integration
- Consistent order response formatting
There is no requirement for any front-end redesign, however, backend readiness is the primary requirement.
Frequently Asked Questions
Is ACP a payment processor?
No. ACP defines the interaction standard. Payment processing is handled by integrated payment providers.
Does ACP replace existing e-commerce platforms?
No. It operates alongside existing systems by adding structured endpoints for AI agents.
Can ACP work with existing payment infrastructure?
Yes. It is designed to integrate with token-based, processor-backed payment systems.
Is user approval required?
Yes. Proper implementations require explicit or pre-authorised consent before transaction execution.
Conclusion
Agentic Commerce Protocol is a structured, machine-readable standard for enabling AI-driven transactions between agents and merchant systems. It formalises how product data is queried, how carts are created, how checkout is initiated, and how payments are authorised and confirmed.
Its primary value lies in interoperability, security, and standardised automation of digital commerce workflows.