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PostNL Address Validation API

developer.postnl.nl

Free plan WebAPI
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Spec score 7.6 #22 of 30 in Address Verification Software

What it is

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.

Spec sheet

Purpose
The API validates international address data, including Netherlands addresses, entered in a webshop or CRM.Read 7 Oct 2026 · developer.postnl.nl
Intended users
PostNL describes the address check for webshops seeking smoother checkout and more accurate address data.Read 7 Oct 2026 · postnl.nl
Integrations
PostNL lists plugins for Magento, WooCommerce, ShopWare, and Opencart for Dutch address validation.Read 7 Oct 2026 · postnl.nl
Support
PostNL invites prospective customers to request a demo or contact its data solutions team for help.Read 7 Oct 2026 · postnl.nl
Headquarters
The Hague, NetherlandsRead 28 Sep 2026 · developer.postnl.nl
Address suggestions
PostNL says the address check suggests matching addresses as customers type a few letters or numbers.Read 7 Oct 2026 · postnl.nl
API access
The international v3 endpoint uses POST and requires an API key and application/json content type.Read 7 Oct 2026 · developer.postnl.nl
Coverage
The API documentation says the service supports over 250 countries, regions, and island groups.Read 7 Oct 2026 · developer.postnl.nl
Input requirements
CountryIso is mandatory; city, postal code, street, and house number are recommended input fields.Read 7 Oct 2026 · developer.postnl.nl
Multiple results limit
The documentation says returning multiple addresses in one response is temporarily unavailable.Read 7 Oct 2026 · developer.postnl.nl
Returned data
The response can include a locally formatted address, address components, mailability and similarity scores, and latitude and longitude.Read 7 Oct 2026 · developer.postnl.nl
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.Read 7 Oct 2026 · annualreport.postnl.nl

Plans and prices

Address check for Benelux addresses Free Free for PostNL parcel-contract customers Benelux addresses · parcel contract required Read 7 Oct 2026 · postnl.nl
International address validation €0.02, paid once Starting price per check (per API call); bundle pricing varies Price starts at € 0.02 per check · bundle depends on address volume Read 7 Oct 2026 · postnl.nl

Every PostNL Address Validation API plan and price →

Strong points and limits

Strong points

  • Coverage exceeds 250 countries and regions
  • Autocomplete, correction, and standardization
  • Returns address scores and coordinates
  • Plugins for major commerce platforms
  • Free Benelux plan for eligible customers

Limits

  • International checks start at €0.02
  • Benelux free plan requires parcel contract
  • Multiple addresses per response unavailable
  • API key and required request format

Who it suits

The API suits webshops and CRM systems that need address autocomplete, correction, and standardized international data. It is especially relevant to PostNL parcel-contract customers validating Benelux addresses.

Verdict

PostNL provides broad address validation with autocomplete, standardized responses, plugins, and international coverage. Costs and eligibility differ by plan, and the temporary single-result limitation should be considered.

Where Specifiction places it

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