Addressr vs PostNL Address Validation API
Addressr
addressr.ioPostNL Address Validation API
developer.postnl.nlSide by side
| Figure | Addressr | PostNL Address Validation API |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 2 | 2 |
| Spec score · Address Verification Software | 8.0 (#11) | 7.6 (#22) |
| Headquarters | Sydney, New South Wales, Australia | The Hague, Netherlands |
| Integrations | The maker documents an MCP package for Claude, Cursor, VS Code Copilot, and other MCP-compatible AI assistants. | PostNL lists plugins for Magento, WooCommerce, ShopWare, and Opencart for Dutch address validation. |
| 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. | PostNL describes the address check for webshops seeking smoother checkout and more accurate address data. |
| Purpose | Addressr provides Australian address validation, search and autocomplete using the Geocoded National Address File (G-NAF). | The API validates international address data, including Netherlands addresses, entered in a webshop or CRM. |
| Support | The maker offers community support through Gitter and quotes for commercial implementation or operational support. | PostNL invites prospective customers to request a demo or contact its data solutions team for help. |
Plans
PostNL Address Validation API
- Address check for Benelux addressesFree
- International address validation€0.02, paid once
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.
PostNL Address Validation API
PostNL Address Validation API checks address data entered in a webshop or CRM for Netherlands and international destinations. As customers type a few letters or numbers, it can suggest matching addresses. Documentation describes coverage across more than 250 countries, regions, and island groups. Responses may include a locally formatted address, component fields, mailability and similarity scores, and latitude and longitude. The service supports correction, standardization, and autocomplete. Its international v3 endpoint uses POST and requires an API key with application/json content. CountryIso is mandatory; city, postal code, street, and house number are recommended inputs. PostNL lists plugins for Magento, WooCommerce, ShopWare, and Opencart for Dutch validation. The Benelux plan is free for PostNL parcel-contract customers and requires that contract. International validation starts at €0.02, paid once per API call, with bundle pricing varying by address volume. Returning multiple addresses in one response is temporarily unavailable. PostNL offers demos and data-solutions support.