Best Buy vs Mercadolibre

Best Buy's public REST API exposes product, store, category, and recommendation data behind a free API key registered through its developer portal. Responses can be returned as either JSON or XML for most endpoints, though the newer Recommendations endpoints are JSON-only. Live probing shows the gateway actively validates keys server-side but returns no CORS headers, so it is built for server-side integration rather than direct browser calls.

Mercado Libre exposes a large REST surface across its Latin American marketplace sites, covering listings, orders, ads, and shipping. Two read-only lookups work without a token: a category by ID, such as `/categories/MLA1051`, and `/sites/{site}/domain_discovery/search`. Everything else, including site lists, currencies, item listings and search, needs an OAuth2 access token from the authorization-code flow. The API itself carries no direct usage fee. Mercado Libre monetizes through marketplace and payment commissions instead.