Introducing OpenInstantCheckout: The Next Era of Agentic Commerce Payments

Making Conversational Checkout A Reality: The Problem We're Solving

AI agents are now capable of discovering and recommending products with unprecedented precision.
But when it comes time to actually buy, the experience breaks down.

Every website still uses its own cart flow, checkout page, and payment gateway.
For AI agents, that’s a dead end — they can’t navigate buttons, popups, or multi-step forms.
For users, it means leaving the conversation or experience that inspired the purchase in the first place.

OpenInstantCheckout (OIC)OpenInstantCheckout solves this problem by providing a universal checkout layer that any AI agent, app, or website can use — instantly, anywhere.

What Is OpenInstantCheckout?

OpenInstantCheckout (OIC) is an open-source, Agentic Commerce Protocol–compliant checkout system that enables instant, one-click transactions directly within AI conversations, feeds, and websites.

It’s the connective tissue between discovery and conversion — designed for the age of agentic commerce.

Think of it as:

• Stripe Checkout for AI Agents: A universal, embeddable checkout that works anywhere
• Open Standard for A2A Payments: Built on the Agent-to-Agent (A2A) payment model, enabling direct merchant-to-agent transactions
• Composable Checkout: Can be embedded into any brand’s site, feed, or conversational interface
• ACP-Compliant: Structured to align perfectly with the Agentic Commerce Protocol

Why This Matters

For AI Agents

AI agents can now complete the loop from recommendation → transaction:

• Instant Transactions: Complete purchases directly in chat or voice interfaces
• Unified Checkout: Works across all ACP-compliant feeds and product listings
• Trust Signals: Agents can confirm verified merchants and transactions through built-in verification layers
• Payment Flexibility: Supports Stripe, Apple Pay, Google Pay, and other ACP-compatible gateways

For Merchants & Brands

Merchants gain access to the next era of conversion infrastructure:

• Frictionless Conversion: Turn any link or AI recommendation into an instant checkout experience
• Zero-Code Integration: Drop in a snippet or API call — no custom backend work required
• Universal Compatibility: Works with any e-commerce platform (Shopify, Etsy, Stripe, WooCommerce, custom)
• Analytics & Insights: Understand which agents and channels are driving conversions

For Developers

Developers and builders can integrate checkout flows in minutes:

• Open Source: Built for customization and extensibility
• Composable APIs: Integrate into any framework, app, or agentic pipeline
• ACP-Native: Follows the same schema and structure as GXO Feeds and the broader Agentic Commerce Protocol
• Interoperable by Design: Works seamlessly with GXO Feeds, Supabase, and ACP registries

How It Works

1. Product Discovery via GXO Feeds

AI agents discover ACP-compliant product feeds through GXO Feeds.
Each product includes metadata like price, description, and checkout manifest URL.

2. Checkout Initialization

When a user (or AI agent) decides to buy:

• The agent calls the checkout_initiate endpoint
• OpenInstantCheckout retrieves pricing and shipping data in real-time
• The buyer confirms through a simple, unified interface

3. Payment Processing

OpenInstantCheckout securely handles:

• Stripe or other ACP-supported payments
• Wallet integrations (Apple Pay, Google Pay, etc.)
• Transaction-level trust and verification via brand domain signatures

4. Order Confirmation

Upon completion:

• The agent receives structured order data back in ACP format
• Merchants receive instant webhooks for fulfillment
• Users can continue chatting or exploring without leaving their current context

Key Features

Universal Checkout Widget

Embed anywhere — websites, feeds, or AI apps:

• Lightweight, embeddable UI
• Fully customizable themes and branding
• One API for desktop, mobile, and conversational interfaces

Multi-Platform Payments

Supports:

• Stripe
• Shopify Payments
• Apple Pay / Google Pay
• ACH / Crypto (coming soon)

ACP Integration

Built from the ground up for ACP compliance:

• Uses standardized product, order, and transaction schemas
• Compatible with all GXO Feeds listings
• Agents can verify merchant authenticity before transacting

Developer Tools

• REST & GraphQL APIs
• Webhooks for order + payment events
• Sandbox mode for testing
• SDKs for JavaScript, Python, and TypeScript

OpenInstantCheckout + GXO Feeds

Together, OIC and GXO Feeds form the core loop of agentic commerce:

1. Discovery → via GXO Feeds
2. Evaluation → AI agent compares verified products
3. Transaction → via OpenInstantCheckout
4. Fulfillment → via merchant integration
5. Feedback Loop → review + performance analytics

This closed loop allows both agents and merchants to interact autonomously — end to end.

The Technical Foundation

OpenInstantCheckout is powered by:

• ACP Checkout Schema v1 – Defines how orders, payments, and receipts are represented
• Stripe & Web Payments API – Secure, tokenized transactions
• Supabase Functions – Serverless backend for order logging and merchant verification
• GXO Registry Integration – Automatically detects verified merchants and ACP feeds

Every checkout session produces structured, verifiable transaction data that feeds back into the Agentic Commerce ecosystem.

Getting Started

For Merchants

1. Sign Up: Visit openinstantcheckout.com
2. Connect Your Store: Shopify, Etsy, Stripe, WooCommerce, or custom integration
3. Customize Checkout: Add branding, payment preferences, and fulfillment rules
4. Deploy: Embed your OIC checkout link anywhere — feeds, websites, or AI agents

For Developers

1. Read the Docs: docs.gxo.dev/openinstantcheckout
2. Install SDK: npm install @gxo/openinstantcheckout
3. Use API: Call /checkout/initiate with a product payload
4. Subscribe to Webhooks: Receive real-time payment and order events

For AI Agents

1. Detect Checkout Endpoint: From any ACP feed product manifest
2. Call OIC API: Initiate the checkout process on behalf of the user
3. Confirm Transaction: Securely execute payment
4. Return Confirmation Data: Structured ACP-compliant order response

What’s Next

OpenInstantCheckout is entering public beta soon, with full merchant onboarding opening later this year.

Coming Soon

• Recurring Subscriptions
• Split Payments & Multi-Merchant Orders
• Wallet Identity & Agent Authentication
• Cross-Agent Purchase Tracking
• Localized Currency Support

The Vision

We envision a world where:

• AI agents can transact as seamlessly as humans
• Every verified brand can sell instantly, anywhere
• Checkout happens within the conversation — not on another site

OpenInstantCheckout is the bridge that makes that world real.

Join the Beta

Be one of the first merchants or developers to integrate OpenInstantCheckout.

→ Join the Beta Waitlist

→ Explore the Docs

→ Follow GXO on X

Thank You

OpenInstantCheckout was born out of the same vision that drives GXO Feeds — a world where AI agents and brands transact directly, transparently, and instantly.

Special thanks to:

• The open-source community around Agentic Commerce Protocol
• Early partners testing A2A transaction flows
• The GXO engineering team for pioneering real-time ACP feed generation
• Every developer and brand preparing to make commerce instant again

Welcome to the era of Instant Agentic Checkout.