Using USPS APIs is a convenient way to get address information, but there are some limitations. First, the APIs are designed for single address check and are not ideal for validation of multiple addresses. Secondly, the documentation is lacking. Third, there are no sample codes or SDKs.
However, there are several third party companies that allow developers to enhance the USPS address database. These companies create address verification software that uses the database information in a less restrictive manner. They also offer support. The USPS website offers free address lookups. Users simply register and get a password. They can then enter a street address and find out whether it's valid. The system will also provide a confirmation email with the password.
The USPS Web Tools API is open source. This allows developers to access the database data without paying. The APIs are available in Python, C#, and iOS. They are free to use, but there are data limits.
Unlike the USPS website, the Web Tools API does not provide error messages. In addition, it does not follow the Basic Authentication or OpenID patterns. These differences can cause new errors to occur. The APIs are updated weekly, and the changes can result in the discontinuation of some APIs. The APIs can be used to generate labels for shipping operations. They can also be used to trigger on-demand mail from CRM applications. In addition, they can help solve delivery exceptions. The APIs are available for a two-week trial. Developers can get up to 1,000 free lookups. Also Read: USPS Tracking
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