Google Safe Browsing vs Scanii

Google Safe Browsing lets clients check URLs against Google's continuously updated lists of malware, phishing, and unwanted-software sites via the v4 threatMatches:find endpoint, the same data that powers warnings in Chrome and Search. A live POST with a syntactically valid but bogus key returned a 400 "API key not valid" error from safebrowsing.googleapis.com, reconfirming API-key auth and HTTPS, and both that call and its OPTIONS preflight echoed the request Origin in Access-Control-Allow-Origin. The API is free for any Google Cloud project under its published quota.

Scanii is a REST API that scans uploaded files, images, and text for malware, unsafe imagery, and inappropriate language across more than 100 image formats and 20+ languages, returning findings, checksums, and content metadata as JSON. A live GET and OPTIONS preflight against api.scanii.com/v2.2/files both returned Access-Control-Allow-Origin: *, and the GET's 401 carried a WWW-Authenticate: Basic realm="Scanii API" header, correcting the stored auth from API Key to Basic Auth (the API key is used as the Basic-auth username, its secret as the password) over HTTPS. New accounts start with free trial credits before moving to metered Starter/Plus/Enterprise plans billed per file scanned.