Shopify Global Catalog vs Best Buy Products API for AI agents
Shopify Global Catalog is a set of Shopify MCP servers that let AI agents search products across all Shopify merchants (Global Catalog) or within one store (Storefront Catalog), with cart and checkout tools, built on the Universal Commerce Protocol (UCP). Best Buy Products API is Best Buy's REST API over its product catalog, past and present, alongside Stores, Categories, Reviews and Recommendations APIs.
The short answer
- Shopify Global Catalog: AI agents that want to search many independent Shopify stores at once and hand the shopper a real merchant checkout link.
- Best Buy Products API: Self-serve access to a large US electronics catalog with live prices and direct add-to-cart links.
Side by side
| Shopify Global Catalog | Best Buy Products API | |
|---|---|---|
| Searches | Products across the whole Shopify ecosystem by text, image or similar-product IDs, with filters such as price, shop, shipping and category; or one merchant's catalog at https://{storedomain}/api/ucp/mcp. | Best Buy's catalog of over a million products, current and discontinued, with pricing, availability, specifications, descriptions and images. |
| Returns | Results grouped by Universal Product ID with offers from multiple merchants; get_product returns pricing and the seller's checkout link for the chosen variant. | Product records with sale and regular price, a BESTBUY.COM product page URL and an add-to-cart URL, plus specs and images. |
| Before the first call | No API key: every request must reference a hosted UCP agent profile. Higher limits and checkout completion need a credential from Shopify's Dev Dashboard (Token tier); anonymous traffic shares one limit and is not for production. | A developer account and an API key, requested with an email address and activated from the emailed instructions; calls are limited per key. |
| Free | No key needed, and its pages state no price | Not stated on its pages |
| Acting on a result | Checkout link to the merchant's own checkout (one per store); agents at the highest trust tier can complete checkout through the Checkout MCP. | Buy link: each product has a BESTBUY.COM product URL and an addToCartUrl; checkout through the separate Commerce Gateway API needs Best Buy's pre-approval. |
| Limits on keeping or showing results | Not stated on its pages | Content may be cached only temporarily, for no more than 72 hours, and only to speed up display; content must be attributed to Best Buy. |
| Coverage | Not stated on its pages | BESTBUY.COM (United States); the Stores API covers stores in the US and Puerto Rico. |
| MCP server | Official Global Catalog MCP at https://catalog.shopify.com/api/ucp/mcp; per-store Storefront Catalog MCP at https://{storedomain}/api/ucp/mcp. | No official server listed |
Where Openpath fits
Openpath has no products listed yet. Sellers can list a product on Openpath today, free, and agents will find it through the same search as jobs and businesses. Get listed.
Questions people ask
What do I need before I can use Shopify Global Catalog?
No API key: every request must reference a hosted UCP agent profile. Higher limits and checkout completion need a credential from Shopify's Dev Dashboard (Token tier); anonymous traffic shares one limit and is not for production.
Is Shopify Global Catalog free?
No key needed, and its pages state no price.
What do I need before I can use Best Buy Products API?
A developer account and an API key, requested with an email address and activated from the emailed instructions; calls are limited per key.
Is Best Buy Products API free?
Its pages listed no free use when we read them on October 15, 2026.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
Shopify Global Catalog, read on October 15, 2026:
- shopify.dev/docs/agents/catalog/global-catalog: “The Global Catalog MCP server enables AI agents to search and discover products across the entire Shopify ecosystem”
- shopify.dev/docs/agents/catalog/global-catalog: “Results are clustered by Universal Product ID (UPID) and include offers from multiple merchants.”
- shopify.dev/docs/agents/catalog/global-catalog: “pricing and seller checkout links for the buyer's chosen variant”
- shopify.dev/docs/agents/catalog/global-catalog: “The `/api/ucp/mcp` endpoint requires an agent profile.”
- shopify.dev/docs/agents/catalog/storefront-catalog: “enables AI agents to search and discover products from a single merchant's catalog”
- shopify.dev/docs/agents: “Higher trust tiers unlock broader access, including direct checkout completion.”
- shopify.dev/docs/agents/profiles/auth-and-rate-limiting: “Agents authenticating with a credential issued through Dev Dashboard”
- shopify.dev/docs/agents/profiles/auth-and-rate-limiting: “The default limit is 5 requests each second for each API client.”
- shopify.dev/docs/agents/profiles/auth-and-rate-limiting: “Don't use unauthenticated requests for production traffic.”
Best Buy Products API, read on October 15, 2026:
- bestbuyapis.github.io/api-documentation: “a simple, REST-based interface for our entire product catalog, past and present”
- bestbuyapis.github.io/api-documentation: “It's easy. Just visit GET API Key and sign up with your email address.”
- bestbuyapis.github.io/api-documentation: “URL to BESTBUY.COM with item in cart”
- bestbuyapis.github.io/api-documentation: “URL to BESTBUY.COM product detail page”
- bestbuyapis.github.io/api-documentation: “Current item selling price”
- developer.bestbuy.com/legal: “To use the Service, you must create a developer account by submitting a completed registration form”
- developer.bestbuy.com/legal: “Best Buy limits the number of calls that can be made using each assigned API Key during a given time period.”
- developer.bestbuy.com/legal: “store or cache any Content except on a temporary basis not to exceed seventy-two (72) hours”
- developer.bestbuy.com/legal: “You must clearly and conspicuously attribute the source of all Content as received from Best Buy.”
- developer.bestbuy.com/legal: “Use of the Commerce Gateway API requires our pre-approval and may not be available to everyone.”