UCP Checker

create_cart

Create a new cart (checkout session). Returns the full cart state including the checkout_session_id needed for get_cart and update_cart. You must call this before using get_cart or update_cart.

Schema

Input Schema

{
    "type": "object",
    "required": [
        "items"
    ],
    "properties": {
        "buyer": {
            "type": "object",
            "properties": {
                "email": {
                    "type": "string"
                },
                "last_name": {
                    "type": "string"
                },
                "first_name": {
                    "type": "string"
                },
                "phone_number": {
                    "type": "string"
                }
            },
            "description": "Optional buyer information"
        },
        "items": {
            "type": "array",
            "items": {
                "type": "object",
                "required": [
                    "variant_id",
                    "quantity"
                ],
                "properties": {
                    "quantity": {
                        "type": "number",
                        "description": "Quantity to add"
                    },
                    "variant_id": {
                        "type": "string",
                        "description": "Product variant ID"
                    }
                }
            },
            "description": "Items to add to the cart (at least one required)"
        },
        "currency": {
            "type": "string",
            "description": "Currency code for the cart (e.g. 'usd', 'eur'). Defaults to 'usd'."
        }
    }
}
Verified Stores
10,619
Member Stores

Stores exposing the create_cart tool

changan.co.il Verified channelmaster.com Verified chantals-couture-2.myshopify.com Verified chaodecor.com Verified chapohats.com Verified chapters.indigo.ca Verified chaptersbookstore.com Verified charbroil.com Verified charg-r.co Verified charlesmayer.com Verified charlie-hudson-clothing.com Verified charlie-paris.com Verified charliemahonceramicspottery.com Verified charlotterusse.com Verified charmandsoul.com Verified charmydecor.com Verified chartpakstore.com Verified chasecricket.com Verified chasingworldwide.com Verified chateaudusavon.com Verified chateausonoma.com Verified cheapbookdepot.com Verified checkcommerce.com.br Verified checkout-us.nothing.tech Verified checkout.amishbaskets.com Verified checkout.artesanoelements.com Verified checkout.avcoboxes.com Verified checkout.boynecountrysports.com Verified checkout.byltbasics.com Verified checkout.callia.com Verified checkout.coffeecircle.com Verified checkout.drinkpassenger.com Verified checkout.easyplant.com Verified checkout.ensorings.com Verified checkout.fabricsusainc.com Verified checkout.huel.com Verified checkout.insteadofflowers.com Verified checkout.italic.com Verified checkout.johnnie-o.com Verified checkout.luckyscent.com Verified checkout.madeincookware.com Verified checkout.magicresin.ca Verified checkout.magicresin.com Verified checkout.orukayak.com Verified checkout.ozhairandbeauty.com Verified checkout.skinsli.com Verified checkout.vuoriclothing.com Verified cheekbonebeauty.com Verified cheerhaven.com Verified cheerstash.com Verified
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Weekly UCP Report
Issue #50 · Sep 14, 2026
+664
new verified stores
Verified rate
Latest spec
Cart capability