The Lob Confidence Score is an object returned from the US verification endpoint that provides a value between 0-100 of the likelihood of the address being deliverable. To generate a score, Lob leverages its extensive insight into mail tracking events to more than 1 in 2 US households for the most comprehensive address deliverability data.
Score definitions
- 70-100% - This address has received one or more successful deliveries
- 40-68% - This address has both mail returned to sender and successful deliveries
- 0-39% - This address has more mail returned to sender than successful deliveries
- None ("") - Lob does not have data on this address
Please note that high scores do not guarantee deliverability. These are estimates based on Lob’s extensive mail tracking data.