Independent US retailers, visible in AI chat.
Shift4Shop (formerly 3dcart) powers thousands of independent US retailers — solid SMB SaaS, payments-bundled, US-tax-aware. xpay reads your Shift4Shop catalogue, publishes to AI surfaces, and routes purchases through your existing checkout.
Native connection · US-tax aware · Routes to your existing checkoutAI ate your search traffic.
People are asking ChatGPT and Google what to buy instead of searching. Those AIs answer — but they don't send buyers to your store. The brands listed inside those AIs make the sale. Everyone else watches.
50%
of Google searches now end without a click to any website$0
you earn when AI answers a shopping question using your products4×
more people using AI to find and buy products than 18 months ago↓30%
average drop in organic search traffic for stores with content-heavy sitesShopping moved. Most brands haven't.
Your customers are asking AI "what's the best yoga mat?" or "find me a birthday gift under $50." If your products aren't inside those AI assistants, you're invisible to your next customer.
Customer asks ChatGPT for a product recommendation. Your brand doesn't show up. Someone else gets the sale.
Google Gemini answers the shopping question — but sends buyers to bigger brands who are already in the system.
With xpay: your products appear inside ChatGPT, Gemini, and 4 other AI assistants — and the buyer pays you directly.
The right shape for the platform you already run.
Shift4Shop is the SaaS storefront of choice for independent US retailers who don"t want Shopify"s pricing or BigCommerce"s complexity but still want a turnkey payments-bundled platform. Most stores are small, owner-operated, US-focused, and operationally straightforward. xpay was built to match that simplicity. Connect through the standard Shift4Shop integration, let your catalogue publish to ChatGPT, Gemini, Claude, and Perplexity, and start showing up in answers when US shoppers ask AI for an independent alternative to Amazon's top result. Your existing US-tax setup, payment processor, and shipping configuration stay exactly as they are. There's no implementation project, no agency engagement, no replatform.
Cloud storefront
Cloud-hosted (they run it)
They host it for you
Built-in storefront
B2C-focused
Best with ACP
Shift4Shop (3dcart) → agent-ready in three steps.
Connect your Shift4Shop account
Authorise xpay through the standard Shift4Shop integration flow.
AI listings publish
Catalogue appears across ChatGPT, Gemini, Claude, and Perplexity within minutes.
Sales settle in your checkout
Agent buys deep-link to your existing Shift4Shop cart.
Listed. Sold. Paid.
US-tax aware
Existing US tax handling carries through to agent listings — no rebuild.
SMB-friendly
No long onboarding or implementation project — connect and go.
Every AI surface, one connect
ChatGPT, Gemini, Claude, Perplexity, and Copilot covered by a single integration.
xpay handles every emerging spec for you.
Curious about the details? Most Shift4Shop (3dcart) stacks pair naturally with ACP.The AIs your customers ask every day.
When a buyer asks any of these "where can I buy X?" — your products appear and they can buy in one tap.
ChatGPT
Used by 200M+ people daily to find and compare productsGoogle Gemini
Built into every Google search and Android phonePerplexity
Fastest-growing AI search engine for shopping researchClaude
Trusted by power users for high-consideration purchase researchMicrosoft Copilot
AI shopping inside Windows, Bing, and EdgeAI shopping agents
Autonomous agents that buy on behalf of customersWhen a shopper asks an AI agent
Once your store is listed, ChatGPT, Claude, and Gemini surface your products as native shopping cards inside their answers. Tap a surface to preview how a relevant query renders — the cards below stand in for your real catalog.
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Categories selling well from Shift4Shop (3dcart) stores
Explore how AI shoppers research and buy in each vertical — and what xpay does to put your brand in the answer.
Or compare with other platforms
xpay supports every commerce platform that matters — pick yours.
And 41 more platforms supported
Magento, BigCommerce, commercetools, Saleor, PrestaShop, OpenCart, Shopware, and many more.Shift4Shop (3dcart) — frequently asked
Quick answers from our onboarding playbook.
Yes — a Shift4Shop plan that includes API access (typically Plus or higher).
Your customers are buying inside AI chat right now.
Your products should be there. List for free today — and start appearing every time someone asks an AI what to buy.