Addrex Address Validation API vs PostalUp
Addrex Address Validation API
addrex.devPostalUp
postalup.comSide by side
| Figure | Addrex Address Validation API | PostalUp |
|---|---|---|
| Price from | $39/mo | $1.58/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 6 | 10 |
| Spec score · Address Verification Software | 8.2 (#8) | 7.8 (#17) |
| Integrations | The API documentation provides curl, Node.js, and Python request examples; the maker does not name specific third-party product integrations on the pages opened. | The developer page provides a Postman collection and an OpenAPI specification for working with the API. |
| Support | The contact page offers technical support by email and says submitted contact forms receive a response within one business day. | The developer page says technical support from its engineering team responds within 24 hours. |
Plans
Addrex Address Validation API
- Free BetaFree
- Pay As You GoPriced on request
- Starter$39 a month
- Growth$79 a month
- Pro$149 a month
- Scale$299 a month
PostalUp
- Free to TryFree
- ZIP Code Database Basic$19 a year
- Starter$29 a month
- ZIP Code Database Standard$39 a year
- ZIP Code Database Deluxe$79 a year
- Professional$99 a month
- ZIP Code Database Business$129 a year
- Scale$299 a month
- ZIP+4 Database Standard$299 a year
- EnterprisePriced on request
In their own words
Addrex Address Validation API
Addrex Address Validation API validates and standardizes U.S. addresses, returning match codes, confidence scores, coordinates, and standardized fields. It supports API requests as well as spreadsheet cleanup: users can upload CSV or Excel files, process detected address columns, and download cleaned data with output fields appended. Cleanup can expand abbreviations, correct typos, parse grid-style inputs, and append ZIP+4 when a match is available. The API accepts a one-line address or structured address fields and returns JSON with validation status, confidence, standardized results, and changes. Free Beta allows 10,000 validation rows per day, requires email verification, and does not include autocomplete. The listed Free Beta plan has 10,000 address lookups per month; paid plans start at $39 a month. Autocomplete suggestions and details are restricted to paid plans. Real-time API address data is not retained beyond the request, while batch files default to seven days of retention and can be deleted sooner. Addrex does not claim USPS DPV or CASS certification.
PostalUp
PostalUp provides ZIP code databases and an address validation API for U.S. address data. The API supports standardization, verification, geocoding, and bulk processing; PostalUp says its address API uses USPS data refreshed monthly. Submitted addresses are processed in real time and are not permanently stored except as needed to provide the service or as permitted by the Privacy Policy. Developers can use API documentation, code examples, a playground, webhooks, and a Postman collection, with examples or options for JavaScript, Python, PHP, Ruby, cURL, Go, and Java. An OpenAPI specification is also available. Database downloads vary by product and include CSV, JSON, Parquet, GeoJSON, and Shapefile formats; listed data sources include USPS, Census, OMB, HUD, and TIGER. Use cases include e-commerce, real estate, logistics, marketing, insurance, and healthcare. The free API plan includes 1,000 requests and basic validation. Paid API plans start at $29 a month; separate database plans are annual, starting at $19 a year for ZIP Code Database Basic. Internal commercial use is included with downloads, but redistribution to customers requires a redistribution license.