Addressr vs UPU POST*CODE API
Addressr
addressr.ioUPU POST*CODE API
upu.intSide by side
| Figure | Addressr | UPU POST*CODE API |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 2 | 1 |
| Spec score · Address Verification Software | 8.0 (#11) | 7.8 (#19) |
| Address data | The maker describes G-NAF as Australia's authoritative address database with more than 15 million addresses. | It provides official locality names and postcode data from UPU member countries. |
| Headquarters | Sydney, New South Wales, Australia | Berne, Switzerland |
| Integrations | The maker documents an MCP package for Claude, Cursor, VS Code Copilot, and other MCP-compatible AI assistants. | 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 | The maker presents the hosted API for teams that do not want to operate G-NAF infrastructure and self-hosting for teams that need infrastructure and data-update control. | UPU describes the API as useful to designated operators, businesses, and individuals handling international addresses. |
| Purpose | Addressr provides Australian address validation, search and autocomplete using the Geocoded National Address File (G-NAF). | POST*CODE API verifies international addresses and helps eliminate addressing inaccuracies. |
| Support | The maker offers community support through Gitter and quotes for commercial implementation or operational support. | The guide directs users with questions about costs, documentation, or a free trial to [email protected]. |
Plans
In their own words
Addressr
Addressr provides Australian address search, validation, and autocomplete through an API or self-hosted software. It uses G-NAF, which its maker describes as Australia's authoritative address database with more than 15 million addresses. Search covers addresses, localities, postcodes, and states or territories. Results include a stable address identifier, and an address-detail endpoint returns structured fields and available geocoding. Teams can use the hosted API through RapidAPI or run the software on their own infrastructure. RapidAPI handles signup, API keys, billing, and plan changes; current hosted prices and request limits are available there. Self-hosting requires Node.js 22 or newer and OpenSearch. The first full data download and index takes about an hour, depending on the machine and options. G-NAF is released every three months, and the maker recommends scheduling updates for a self-hosted index. Optional latitude and longitude geocoding for self-hosting requires more memory and increases indexing time. The self-hosted software is free at free under an Apache-2.0 licence, but the team supplies its infrastructure, hosting, monitoring, and data updates. Addressr also documents an MCP package for Claude, Cursor, VS Code Copilot, and other compatible assistants.
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.