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Are you simply proxying the USPS API or are you making queries against data you purchased from them? If so, which data did you purchase?

For the US, yes we are using USPS data as it is the most accurate and up to date.

Right, but are you proxying the API or do you have a database locally you're querying?

Querying their API and we have a backup source as well when USPS goes down (ie last week)