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PostNL Address Validation API
The Hague, Netherlands
What it is
PostNL Address Validation API checks international address data, including Netherlands addresses, entered in a webshop or CRM. It can suggest matching addresses as a customer types a few letters or numbers, and its documentation lists coverage across more than 250 countries, regions, and island groups. A response may include a locally formatted address, address components, mailability and similarity scores, and latitude and longitude. The service supports address correction, standardization, and autocomplete. For Dutch address validation, PostNL lists plugins for Magento, WooCommerce, ShopWare, and Opencart. The international v3 endpoint uses POST and requires an API key and application/json content type. CountryIso is required; city, postal code, street, and house number are recommended inputs. A free Benelux address-check plan is available to PostNL parcel-contract customers, who must have a parcel contract. International checks start at € 0.02 per check, with bundle pricing varying by address volume. Multiple addresses in one response are temporarily unavailable.
For and against
For
- Coverage spans over 250 countries, regions, and island groups.
- Suggests matching addresses while customers type.
- Responses can include scores and coordinates.
- Dutch plugins are listed for four platforms.
Against
- Free Benelux checks require a PostNL parcel contract.
- International checks start at € 0.02 per check.
- Multiple results in one response are temporarily unavailable.
- International endpoint requires an API key.
The verdict
PostNL Address Validation API combines address suggestions with correction and standardization across international coverage. Check the parcel-contract condition for free Benelux use and the current single-address response limitation before integrating.
Who it suits
The API suits webshops and CRM users seeking to validate, correct, or standardize international address data. Dutch address validation is also listed through plugins for several commerce platforms.
Plans and prices
Address check for Benelux addresses
Benelux addresses · parcel contract required
Read 7 Oct 2026 · postnl.nl
International address validation
Price starts at € 0.02 per check · bundle depends on address volume
Read 7 Oct 2026 · postnl.nl
On the record
- Address suggestions
- PostNL says the address check suggests matching addresses as customers type a few letters or numbers.postnl.nl · read 7 Oct 2026
- API access
- The international v3 endpoint uses POST and requires an API key and application/json content type.developer.postnl.nl · read 7 Oct 2026
- Coverage
- The API documentation says the service supports over 250 countries, regions, and island groups.developer.postnl.nl · read 7 Oct 2026
- Input requirements
- CountryIso is mandatory; city, postal code, street, and house number are recommended input fields.developer.postnl.nl · read 7 Oct 2026
- Integrations
- PostNL lists plugins for Magento, WooCommerce, ShopWare, and Opencart for Dutch address validation.postnl.nl · read 7 Oct 2026
- Intended users
- PostNL describes the address check for webshops seeking smoother checkout and more accurate address data.postnl.nl · read 7 Oct 2026
- Multiple results limit
- The documentation says returning multiple addresses in one response is temporarily unavailable.developer.postnl.nl · read 7 Oct 2026
- Purpose
- The API validates international address data, including Netherlands addresses, entered in a webshop or CRM.developer.postnl.nl · read 7 Oct 2026
- Returned data
- The response can include a locally formatted address, address components, mailability and similarity scores, and latitude and longitude.developer.postnl.nl · read 7 Oct 2026
- Security and privacy
- PostNL's 2025 annual report says its privacy policy outlines principles for personal-data use and its cyber security framework is aligned with ISO/IEC 27001/27002 and the NIST Cybersecurity Framework.annualreport.postnl.nl · read 7 Oct 2026
- Support
- PostNL invites prospective customers to request a demo or contact its data solutions team for help.postnl.nl · read 7 Oct 2026
