FilterLists vs National Vulnerability Database

FilterLists is Collin Barrett's independent, actively-maintained directory of filter and host lists used by adblockers, firewalls, and DNS sinkholes to block ads, trackers, malware, and other unwanted content. Its ASP.NET Core REST API serves the same catalog that powers the site -- filter lists, the domains/URLs they target, licenses, and maintainer info -- with an interactive Swagger UI for exploring the schema before writing a query. The API and site are fully free and keyless, open-sourced on GitHub with commits as recent as this week. The API lives entirely on a separate `api.filterlists.com` host -- the intuitive REST paths on the main `filterlists.com` domain just return the site's own SPA shell.

NIST's NVD API 2.0 is the government's canonical feed of CVE records, each enriched with CVSS scores, CPE product matches, CWE weakness types, and (where applicable) CISA Known Exploited Vulnerabilities flags. It's fully public and keyless, though a free API key lifts the rolling rate limit from 5 to 50 requests per 30 seconds, and NIST recommends polling by lastModStartDate/lastModEndDate rather than re-pulling the whole dataset. The stored URL pointed at a legacy JSON-feed changelog page; corrected to the current "Start Here" developer docs for the 2.0 REST API.