When you want to use an API to validate addresses, you must make sure that the addresses are correctly formatted. In the U.S., for example, you need a single line address that contains a city and state code, or the country code, if you are using an Australian address format. For a P.O. Box, you can use a state code instead. The API will resolve addresses if they are not correctly formatted, but it is not possible to determine whether or not they are deliverable. In countries that do not have postal codes, a state code will suffice. The API will attempt to normalize input addresses by replacing common roadway identifiers with standard abbreviations and reordering the different components of the address.
There are many different types of APIs for validating addresses. Some are free, while others are paid. Those that offer free versions of their API are generally the fastest and easiest to use. You can also use the free version to test the app out. While the free account offers a decent amount of power, a premium account will give you more flexibility. If you need to validate hundreds of addresses in one go, then this is the way to go.
Depending on the type of address you need to validate, an API can be very useful. Most of them will validate addresses worldwide, through the USPS and other postal services. The free version offers a lot of functionality, but you can also upgrade to a premium account to get more features. If you have a high-volume of addresses, then you'll be better off with the premium version. The free version will work just fine, but the premium version will allow you to use more powerful functions.
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