If you've come across us1.offering-api.kambicdn.com in your network logs or code, you're likely looking at a technical backend service, not a website meant for casual browsing. The name itself — "offering-api" — suggests it's an API for delivering content or offers, and the use of AWS CloudFront as a CDN confirms this is a production-grade infrastructure component.
Most legitimate API endpoints don't have an about page, contact info, or legal disclosures. They're designed to be accessed by applications, not humans. us1.offering-api.kambicdn.com fits that pattern: it returns a 429 status to automated requests (bot protection), has a valid SSL certificate, and enforces encrypted connections. The lack of a WHOIS record for this subdomain is also normal — it's a subdomain of kambicdn.com, which itself is likely owned by a known company (Kambi is a sports betting technology provider).
From a security and infrastructure standpoint, the setup is solid. The site is not on any blacklists, and Google Web Risk reports no threats. If you're wondering whether us1.offering-api.kambicdn.com is a scam or fake, the evidence points to a legitimate backend service. The main thing to watch for is whether you're actually supposed to be using this API — if you're not a client of the service, you probably won't get useful responses. But as far as trust goes, this is a well-configured, secure endpoint with no warning signs.