AbuseIPDB vs Google Safe Browsing

AbuseIPDB is a crowdsourced IP, domain, and URL reputation database where network operators report malicious activity like brute-force attempts, spam, and port scans. A live GET against the real gateway, api.abuseipdb.com/api/v2/check, returned a 401 with an invalid key rather than a CORS-enabled response, reconfirming API-key auth over HTTPS and resolving cors to no. A free Individual tier allows 1,000 checks a day forever with no card required, while paid Basic/Premium/Enterprise plans raise the daily ceiling for high-volume users.

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.