Source: I helped build a USPS CASS-certified address verification and NCOA API at my previous employer. Dealing with USPS licensing was a PITA.
https://postalpro.usps.com/ncoalink/Full_Service_Provider_Li...
https://postalpro.usps.com/ncoalink/Limited_Service_Provider...
So if this data doesn't exist (US market)... perhaps some clever dev-team should try to aggregate/scrape this and make an affordable paid API service for it ;-)
Lob, as a mail provider, built and licenses this from the USPS for its mail operations but is unable to sell it to customers due to licensing and regulatory issues. Similarly, SmartyStreets used to sell this service but discontinued it due to the amount of regulatory and reporting work that was required to keep the licensing rights.
Source: I used to work at Lob and helped build those systems.
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