Meant: building the full UCP commerce lifecycle

[davidtilser]

Hi everyone,

UCP caught my attention, so I started building a product around it to see how far the protocol could take a real shopping experience.

The goal of Meant is support as much of the commerce lifecycle as UCP makes possible. So from discovery and cart management through checkout, embedded checkout, payments, orders, identity linking etc.

• Live app: https://app.usemeant.com
• Public UCP agent profile: https://api.usemeant.com/.well-known/ucp-agent.json

What works today

The live product currently supports:

• Conversational product discovery through Shopify’s Global Catalog
• Personalized ranking based on user preferences
• Product and offer comparison across merchants
• Product identity resolution and grouping of equivalent offers
• A coordinated multi-merchant cart, while preserving a separate transaction for each merchant

The currently implemented UCP flow includes:

• UCP 2026-04-08 agent profile and capability negotiation
• Catalog search and lookup, including Shopify catalog extensions
• Cart create, get, update, and cancel
• Cart-to-checkout conversion
• Checkout create, get, update, and cancel
• Checkout updates with buyer details and shipping address.
• Embedded checkout integration through Shopify Checkout Kit and ECP

Where I am blocked: end-to-end Shopify testing

I have not found a documented UCP testing environment that lets an independent agent validate this entire path:

Catalog → Cart MCP → Checkout MCP → ECP/Checkout Kit → test payment → test order → get_order → order webhook updates

Can a normal Shopify development store be connected to the UCP MCP endpoints and use Bogus Gateway or Shopify Payments test mode? Or does this require a Shopify Agentic Commerce partnership or allowlist?

The order documentation says webhook delivery is configured through a Shopify partner manager. What is the procedure for an independent product that does not yet have a partner manager?

If anyone from Shopify’s Agentic Commerce/UCP team can help me access a suitable test environment or connect me with the right team, I’d really appreciate it. I’d also be happy to share a live demo and any technical details that would be helpful.

What about Etsy, Walmart, Target, Wayfair, and other UCP partners?

UCP.dev names Etsy, Target, Walmart, Wayfair and others as partners, but I have not found public endpoints.
Is there a early-access route for independent agents, or should developers currently treat these integrations as private/platform-specific deployments?

I would love to connect with the Shopify team, other provider teams, independent builders, and anyone who's interested in agentic commerce. Feedback on Meant would be very welcome.