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To be clear, is this CASS/DPV-style validation? Is it certified CASS/DPV? If so, that would be awesome. Any info on usage limits for the free tier, etc? Can we use this for address verification only or is it required to purchase as well?

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Indeed it is! And there's no usage limits

What's the preferred request rate to be polite?

For testing - try to keep it reasonable (a few req/s).

If you are worried about exceeding our limits in production (via bulk or your site has that much traffic) feel free to email us: contact@geteasypost.com

Well within what I was planning (1 request per minute).

Thank you!

In the UK, sign-up forms that need addresses often let you enter a postcode then choose among a handful of buildings. This is usually based on Royal Mail 'PAF' data - for a price, they'll give you a CSV file of every address they deliver to.

Is there any US equivalent? What data do you use to back the address verification?

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