chamberofcommerce.com
In short: Getting listed on ChamberofCommerce.com is free, with optional paid upgrades. Plan for about 45 minutes — there is material to prepare and a review to wait on.
What they ask for: Add or claim your tool only if it has a genuine US business presence, then verify the website and business details.
Add or claim your tool only if it has a genuine US business presence, then verify the website and business details.
US-focused local directory; eligibility, verification, and public-link treatment should be confirmed before submission.
Open the submission page on chamberofcommerce.com and complete its form — that is the "Open submit page" link at the top of this page.
US-focused local directory; eligibility, verification, and public-link treatment should be confirmed before submission.
Priority sets the band — this one is later. Cost (free + paid tier) and effort (moderate) move it within that band, which puts it in the long tail tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.