USPS v3 Address Validation in 30 Seconds

The USPS v3 REST API replaced the old Web Tools XML API in January 2026. Address validation is one call — no XML parsing, no USERID registration, no SOAP envelopes.

One curl command

curl "https://api.revaddress.com/api/address/validate?streetAddress=1600+Pennsylvania+Ave+NW&city=Washington&state=DC&ZIPCode=20500" \
-H "X-API-Key: rv_live_your_key_here"

That returns a clean JSON response:

{
"address": {
  "streetAddress": "1600 PENNSYLVANIA AVE NW",
  "city": "WASHINGTON",
  "state": "DC",
  "ZIPCode": "20500-0003"
},
"deliveryPoint": "00",
"carrierRoute": "C000",
"DPVConfirmation": "Y",
"vacant": "N"
}

DPVConfirmation: "Y" means USPS confirmed this is a real, deliverable address. No guessing.

Python and Node.js

from usps_v3 import USPSClient

client = USPSClient(api_key="rv_live_your_key_here")

result = client.addresses.validate(
  street_address="1600 Pennsylvania Ave NW",
  city="Washington",
  state="DC",
  zip_code="20500",
)

print(result.address.street_address)
# 1600 PENNSYLVANIA AVE NW

import { USPSClient } from "usps-v3";

const client = new USPSClient({ apiKey: "rv_live_your_key_here" });

const result = await client.addresses.validate({
streetAddress: "1600 Pennsylvania Ave NW",
city: "Washington",
state: "DC",
ZIPCode: "20500",
});

console.log(result.address.streetAddress);
// 1600 PENNSYLVANIA AVE NW

curl -s "https://api.revaddress.com/api/address/validate\
?streetAddress=1600+Pennsylvania+Ave+NW\
&city=Washington\
&state=DC\
&ZIPCode=20500" \
-H "X-API-Key: rv_live_your_key_here" | jq .

Both SDKs are open source: Python (PyPI) · Node.js (npm)

What you get back

Batch validation

Need to validate hundreds of addresses? Use the batch endpoint (Growth tier, up to 50 per call):

curl -X POST "https://api.revaddress.com/api/batch/validate" \
-H "X-API-Key: rv_live_your_key_here" \
-H "Content-Type: application/json" \
-d '{
  "addresses": [
    {"streetAddress": "1600 Pennsylvania Ave NW", "city": "Washington", "state": "DC"},
    {"streetAddress": "350 Fifth Avenue", "city": "New York", "state": "NY", "ZIPCode": "10118"}
  ]
}'

Next steps

• Batch validation tutorial — validate 50 addresses in one call
• Full API reference — request/response examples, live try-it, and admin diagnostics
• Interactive API docs — try requests live in the browser
• Rate limit guide — understand the 60/hr USPS cap and how we handle it
• Migration guide — converting from Web Tools XML
• Get your API key — free to start, no credit card required