What is the easiest way to do this? I've read Google Map API can't legally be used as an address verification service. What are some practical alternatives and/or respected premium/pay-per-request services?
Address Validation API from '09 - Address validation using Google Maps API
Use www.usps.com to check the ZIP Codes in your list. Process your address list through CASS-certified software. Address List Correction Service. You can submit a printout of your list to the Postal Service and we will mark any changes.
The UPS address validation API is free to use and enables developers to add UPS address validation to their internal and customer shipping address forms.
First, enable Google Places API Web Service. Get the API key. You will have to use it in the script tag in html file. Use script file to load the autocomplete class.
I'm glad you asked this question.
UPS and USPS both offer free APIs for address verification.
However, USPS requires that you can only use their APIs if you intend on using their shipping service. UPS doesn't appear to have this restriction. The TOS looks fairly boilerplate and you aren't required to use them for shipping (although I'm not a lawyer so idk).
USPS Developer Kit - https://www.usps.com/business/webtools.htm?
UPS eCommerce APIs - https://www.ups.com/upsdeveloperkit?loc=en_US
List of 7 Address Verification Services - http://www.programmableweb.com/news/7-package-tracking-apis-rock/review/2014/08/26
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