From a user standpoint, I know of no service that will perform ID verification for 'free' and certify that verification onto a third-party verification request. (Credit card verification, or mail-you-a-postcard verification, doesn't count, as there's no ID check.)

I believe this ends up having to be a government service, where the post office is obliged to certify third-party verification requests presented to it (for private parties, corporations, and/or government divisions), and this service is offered for free at personal-use volumes and for one postage stamp per request at for-profit volumes.

It's still possible a B-corp or non-profit could decide to offer this as a public service, but that would take a billion-dollar endowment and would duplicate the USPS frameworks already in place to check IDs and verify mailing addresses for Informed Delivery at every post office in the country, so I wouldn't bet on anyone taking on that cost without payment.