The "payers" service from the IRS can be located by searching using the term "E Services." It is described as:
Taxpayer Identification Number (TIN) Matching
TIN Matching is a pre-filing service offered to payers and/or authorized agents who submit any of six information returns subject to backup withholding (Forms 1099-B, INT, DIV, OID, PATR, and MISC). With Interactive TIN Matching authorized payers can match up to 25 payee TIN and name combinations against IRS records prior to submitting an information return. Bulk TIN Matching allows payers and/or authorized agents filing any of the six information returns to match up to 100,000 TIN and name combinations. In order to participate in TIN Matching, payers must be listed in the IRS Payer Account File (PAF) database. If your firm has not filed information returns with the IRS in one of the past two tax years, the application will not be available to you at this time.
Any commercial service that offers to "verify" name/TIN combinations is probably better than nothing. In my opinion, the IRS Service is probably better than all of them put together.
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.