Tag
Address validation, by operating job
Start with the job in front of you: validate one address in an application, repair a file in bulk, or compare the cost and operating burden of vendors. These guides keep those decisions separate.
13 reviewed guides
01
API implementation and failure handling
02
Batch and file-quality workflows
03
Vendor pricing and operating tradeoffs
- USPS v3
- Pricing
- Address Validation
- Vendor Comparison
- Web Tools Migration
- Districts
- Redistricting
- Troubleshooting
- USPS License
- OAuth
- Quickstart
- Rate Limits
- API Governance
- Customs
- EasyPost
- Ecommerce Platforms
- International Shipping
- Migration
- USPS Enrollment
- Architecture
- BYOK
- Checkout
- Data Quality
- PHP
- Political Mail
- Reference
- SDK
- SDKs
- Tracking
What an Address File Audit Finds Before the Next Mailing
See the eight questions an address file audit should answer: match quality, ZIP damage, duplicates, geography, vacancy, list decay, repairs, and waste.
8 min readExperian Address Validation (QAS) vs RevAddress: What Quote-Only Pricing Actually Costs You in 2026
Experian's Address Validate API is quote-only: 1 credit per successful lookup, price on request. What to ask for, and what published flat pricing buys.
9 min readPostGrid vs RevAddress: Address Validation Compared (2026)
PostGrid bills US address verification from $18 a month with a per-lookup geocoding surcharge. What it includes, what it does not, and where each one fits.
9 min readLoqate vs RevAddress: What Address Verification Costs in 2026
Loqate publishes 4.1 to 4.7 cents a lookup for US address capture and quotes verification on request. What that costs at volume, against a flat plan.
9 min readMelissa Address Verification Pricing in 2026: What Three Credits Per US Address Actually Costs
Melissa bills US address verification in credits: 3 per address, so a $40 pack of 10,000 credits is about 3,300 lookups. The real per-lookup math for 2026.
10 min readLob vs RevAddress: Address Verification Pricing and the Plan Underneath It
Lob's cheap verification bundles ride direct-mail plans that start at $260/mo. The published August 2026 rates, DPV depth, and when each is right.
9 min readGoogle Address Validation API Pricing in 2026: The Per-Request Curve, the CASS Option, and the 30-Day Caching Rule
Google's Address Validation API costs $17 per 1,000 calls after 5,000 free, and its terms cap caching at 30 days. The real curve, and when flat pricing wins.
10 min readRevAddress Checkout Guard: Drop-In Address Risk Widget
One script tag adds inline address checking to any address form you control. The real contract: attributes, badge states, sandbox keys, and how it fails.
6 min readSmarty vs RevAddress: Address Validation API Compared (2026)
Smarty's US Address Verification runs $17 to $485 a month by volume, checked August 2026. What that buys, and what a flat USPS-native plan costs instead.
9 min readUSPS Batch Address Validation: 50 Addresses per Call
Validate 50 US addresses in one request. The exact payloads, per-address failure handling, rate-limit backoff, and how to run a 10,000-row list through it.
10 min readUSPS v3 Address Validation: One Request, Start to Finish
The USPS v3 address call in curl, Python and Node: OAuth, the required parameters, every DPV code, and the license USPS has required since August 1, 2026.
9 min readUSPS Node.js SDK Quickstart: TypeScript Client for the v3 API
Install usps-v3, authenticate once, and call address validation, tracking, rates, and labels from Node. Zero dependencies, typed errors, Express route.
12 min readUSPS Python SDK Quickstart: Validate, Track, and Rate with usps-v3
Install usps-v3, authenticate once, and call address validation, tracking, and rates from Python. Working code, real return shapes, typed errors.
11 min read