Kelley Blue Book vs RevCarData

Kelley Blue Book's Cox Automotive-run API program (IDWS, Advertising Data, Instant Cash Offer, and Batch VIN) provides vehicle valuation, pricing, and configuration data behind an approval-gated API key, per developer.kbb.com's own access instructions. Its legacy Swagger doc-viewer content pages (/content/data/*.html) now 404 into the site's SPA shell — orphaned — but the surrounding portal, the key-request process, and Cox Automotive's successor developer platforms (developer.coxautoinc.com, coxautoinc.mashery.com) all remain live over HTTPS, confirming https true and that the program has moved rather than gone dead; cors could not be re-probed live since no public endpoint or key is available. Access requires Cox Automotive approval with no public self-serve signup — paid.

RevCarData is a global Year-Make-Model-Trim vehicle database covering EU, US, and Asian markets, exposing 38 structured spec fields — MSRP, powertrain, dimensions, and EV/battery metrics — via a REST API and CSV export. A live GET against its real API host, api.revcardata.com/api/v1/vehicles, returned a 401 "Missing X-API-Key header" error carrying access-control-allow-origin echoing the request Origin — reconfirming auth "API Key" and cors "yes" — over HTTPS. Its site offers a free sign-up-and-get-a-key tier alongside paid plans for higher volume — freemium.