Using the US Postal API for Address Validation

When you use the USPS API to process addresses, you can get a standardized response indicating whether or not an address is valid. USPS maintains an extensive database of addresses within the US, making the US postal service a valuable resource for address validation. The USPS API does not guarantee the validity of addresses submitted to it, but using a private database will give you a more accurate idea. Using the USPS API for business purposes, however, is not a good idea, because the USPS is not an ideal choice, with bad documentation and very restrictive terms of service.

The USPS API is free to use once you register. However, you can't use it for any other purpose, including database cleansing or record management. In addition, the USPS API doesn't provide SDKs, so you will need to write code on your own instead. There are no tutorials or examples on how to use the USPS API, so you will have to write your own. Luckily, most of these APIs are extremely easy to use.

Third-party service providers can use the USPS API to access address data. However, they must be certified by CASS. CASS is the USPS's certification program that grants access to the address database. Getting the CASS certification isn't easy, so you should be aware of the requirements. You should also take into account the cost of USPS address validation. The service is worth the effort if you have a lot of money to spend.