Descripio Amazon Reviews vs eBay

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.

eBay's REST platform — Browse, Sell, and related APIs — requires an OAuth2 client-credentials or authorization-code token, confirmed live by a standard invalid_client error from its token endpoint, and is built for server-side integration rather than in-browser calls. New developer accounts get a free daily call allowance with no published paid tier, and higher volume comes from an approval process rather than a fee.