Descripio Amazon Reviews vs Mercadolibre

Descripio Amazon Reviews is a live async review-aggregation API that pulls and caches Amazon product reviews across a dozen marketplaces, returned as JSON once a scrape job completes. It is gated by a Bearer API key on a tiered free-plus-paid plan, though cached-review reads stay unlimited and free on every tier. The live host cleanly enforces auth, rejecting both missing and invalid keys, but returns no CORS headers for cross-origin browser calls.

Mercado Libre exposes a large REST surface across its Latin American marketplace sites, covering listings, orders, ads, and shipping. Public reference data like site categories is reachable without a token, but anything scoped to a seller account requires an OAuth2 access token obtained via an authorization-code or client-credentials grant. The API itself carries no direct usage fee — Mercado Libre monetizes through marketplace and payment commissions instead.