Does the Match API use OS Places?

We are an OS partner and have an alternative offering to OS Places which has been built from the ground-up using our own proprietary algorithm based on 20 years of experience with UK addressing in general and OS data in particular.  Under the hood we are using OS and Royal Mail data, we can provide an AddressBase premium results or if appropriate for the use case our own AddressFirst offering which combines the best of OS & PAF.  We will return the (UPRN/UDPRN as applicable), postcode and rooftop coordinates.  Our price covers our service cost as well as royalty returns to the data providers.