Addrex Address Validation API vs UPU POST*CODE API
Addrex Address Validation API
addrex.devUPU POST*CODE API
upu.intSide by side
| Figure | Addrex Address Validation API | UPU POST*CODE API |
|---|---|---|
| Price from | $39/mo | — |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 6 | 1 |
| Spec score · Address Verification Software | 8.2 (#8) | 7.8 (#19) |
| 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 API can be used as a CDS plugin, through the CDS API gateway or other middleware, or integrated into postal websites and local applications. |
| Intended users | Addrex describes its service as useful for spreadsheet cleanup or app-connected workflows and cites shipping, onboarding, insurance underwriting, territory mapping, and analytics as address-data use cases. | UPU describes the API as useful to designated operators, businesses, and individuals handling international addresses. |
| Purpose | Addrex validates, standardizes, and classifies U.S. addresses and returns standardized results with match codes, confidence scores, and coordinates. | POST*CODE API verifies international addresses and helps eliminate addressing inaccuracies. |
| Security | The security page says data in transit uses TLS 1.2+, stored data uses AES-256 encryption, API keys are revocable and hashed, and PII is excluded from application logs by default. | The CDS setup guide describes a security token used to identify and authenticate a CDS installation, with tokens unique to countries. |
| Support | The contact page offers technical support by email and says submitted contact forms receive a response within one business day. | The guide directs users with questions about costs, documentation, or a free trial to [email protected]. |
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
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.
UPU POST*CODE API
UPU POST*CODE API verifies international addresses using official locality names and postcode data from UPU member countries. Its checks cover a country’s postcode format, whether a postcode matches a locality, postcodes associated with a locality, and localities associated with a postcode. LocalityLike suggests official locality names and postal regions from the beginning of a partial locality input. The API is intended for designated postal operators, businesses, and individuals handling international addresses, including customs declarations, web shops, user platforms, and ERP systems. It can run as a CDS plugin, through the CDS API gateway or other middleware, or inside postal websites and local applications. Development guidance covers HTML, web applications, JavaScript form handling, and sample code for jQuery and Python. Documentation includes tutorials, quick-start guides, and developer tooling. UPU says response time is under one second and performance can be adjusted to expected call volume. Pricing is on request, with a free trial available by contacting UPU.