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For the American case, the USPS has a free API to do address validation and standardization. USPS APIs in general: https://www.usps.com/business/web-tools-api

by msla 2y ago

For the American case, the USPS has a free API to do address validation and standardization. USPS APIs in general: https://www.usps.com/business/web-tools-apis/#dev https://www.usps.com/business/web-tools-apis/#dev https://www.usps.com/business/web-tools-apis/documentation-updates.htm https://www.usps.com/business/web-tools-apis/documentation-u... The specific API: https://www.usps.com/business/web-tools-apis/address-information-api.htm https://www.usps.com/business/web-tools-apis/address-informa...

michaelcampbell 2y ago
FWIW, I've used this API for some years. On the con side, it uses XML, but on the pro side, it's fast, reliable, and consistent. And free, at least for my volumes.