Google Safe Browsing vs MalDatabase

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.

MalDatabase distributes daily-refreshed malware datasets and threat-intelligence feeds — file hashes, behavioral sandbox data, and contacted-domain lists — for use in research and machine-learning training sets. A live call to its real download host, api.maldatabase.com/download, with an Authorization header returned a plain-text 400 error rather than a CORS-enabled response, reconfirming API-key auth over HTTPS and resolving cors to no. Its published plans run from a free 50-samples/day researcher tier up to a $49.99/month Unlimited plan covering 2,000–2,500 samples/day.