BREAKING: USPS slashes address verification to 60 addresses/hour. What now?
Smarty

The API whisperer: How to analyze Smarty's API output like a pro

Come check out our newest webinar, where our specialists talk about how to analyze Smarty's API output like a Pro!
Updated December 4, 2025
Tags
Come check out our newest webinar, where our specialists talk about how to analyze Smarty's API output like a Pro!

Smarty's US Street Address API and International Street Address API provide a lot of output. Things like Carrier Route, Congressional District, geocode, eLOT sequence, timezone, and much much more are available with every address check.

But there may be points of data that you’re not entirely sure what it means or how to use it.

In a recent webinar, we brought Lyle Durland, Head of Support, and Jeffrey Duncan, Technical Product Manager, together to outline some of the more useful points of data, and how to interpret it. Watch it now.

US Street API slide 1
Lyle began by pointing out that there are two particular properties that are extremely valuable: DPV Match Code, and Enhanced Match. These data points will answer:

  • Which addresses are valid?
  • Does an address actually exist or not?
  • Which mail carriers and delivery services will be able to deliver a letter or package to the address?
  • Is the address in the output the same one as the one in the input?

First, here are the possible values for DPV Match Code.

DPV Match Code values

So this tells you if an address is present in the USPS data and can be delivered by them. It can be handy to know if you're mailing something to discover that you're missing an apparent number.

There are some carriers that will ship to addresses that are not in the USPS address database but still exist.

This is where Enhanced Match data can come in very handy.

Enhanced match values

If an address is marked as non-postal-match in the enhanced match data, then you can likely still mail it.

To learn more about the details of these properties, you can view the full webinar recording here.

Subscribe to our blog!
Learn more about RSS feeds here.
Read our recent posts
How to build and validate address lists for direct mail marketing
Arrow Icon
Looking to build a direct mail marketing campaign? You’ve come to the right spot. Before you can send marketing mail like a pro, you’ll need to build a list of verified addresses. Otherwise, frequent misdeliveries and costly redeliveries can take the wind right out of your campaign’s sails. On top of that, a bad address list could lead you to miss out on mind-blowing postal discounts. 😱Don’t let bad addresses capsize your campaign. With a US Master Address List of over 210 million verified addresses—available by state, county, or nationwide—and shipshape US Address Verification, you can construct new lists or clean active ones with the swagger of a seasoned captain.
USPS API rate limit capped at 60 requests per hour: How to prepare and why many are choosing Smarty
Arrow Icon
Because who doesn’t love juggling one more thing during the holiday season…? A major shift in the address-verification landscape is approaching at the beginning of the new year. On January 25, 2026, the United States Postal Service (USPS) will officially retire its long-standing Web Tools APIs, a free API that previously allowed for approximately 5 address lookups per transaction. This includes the legacy USPS Address Information APIs that many organizations have depended on for years. Under USPS’s new API structure, the default quota for many services, including the Addresses API, is 60 requests per hour.
Pinpoint 2025: Day 1 recap
Arrow Icon
For two days, Smarty users gathered together with other address data experts for Pinpoint, Smarty’s first virtual user conference, where developers, industry experts, and product specialists talked all things addresses and pulled back the curtain on address data solutions. Attendees asked questions about cloud-based software, the impact of accurate address data on fintech and insurance companies, and the ROI of good address data across all industries. Plus, attendees got to take a peek behind the scenes and see what makes Smarty’s address data solutions tick.

Ready to get started?