How is Lob’s Address Verification API priced? Please click here for more information on Lob’s Address Verification API. Related articles How is Lob’s Address Verification API priced? Is your US Address Verification API CASS Certified? How does billing for Lob's Address Verification plans work? If an address is unsuccessfully verified, does that count towards my monthly volume? How many pages are included in the base price of a letter?