I would really like to know the answer to this. If they are just turning around and hitting USPS data for this, then last I checked, they are violating the TOS.

I would really like to know the answer to this. If they are just turning around and hitting USPS data for this, then last I checked, they are violating the TOS. Even if you have your own account, you can only use the address validation IF you are also going to ship to that address with USPS. Perhaps they are using some other address validation service/data that allows for it.