⏰ Old Post This post is over 10 years old - it might be slightly outdated and consigned to the history books. APIv9 is now available at http://api.builtwith.com. This new version includes 2 new properties on each lookup - • IsDB - A true/false if this result came from the database or was a live lookup. • Vertical - The vertical classification of the website based on IAB Tier 1 categories (like Business/Automotive/News etc..) A new parameter (NOMETA) provides the ability to not return meta data, which will increase the performance of the API if you do not require this data. See http://api.builtwith.com for more documentation.