UPU POST*CODE API review
A focused API for validating global postcodes, localities and address data.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
UPU POST*CODE API is an international postcode and locality verification service from the Universal Postal Union. It is designed for postal operators, businesses and applications that capture or verify address information across countries. The API supports postcode format validation, country-based postcode lookup, locality validation, postcode-to-locality and locality-to-postcode lookups, postcode-locality matching, and locality autocomplete suggestions. Its reference data covers UPU member countries, making it particularly relevant to postal websites, customs declaration systems, e-commerce applications and other software handling international addresses.
Pricing is arranged directly with the UPU, with API fees available through pay-as-you-go or annual subscription arrangements. Registration also provides free calls for trying the API. The service is available through web and API platforms, with SDKs and plugins intended to support integration. Listed integration contexts include the Customs Declaration System, postal websites, web applications and e-commerce applications. This makes the product a practical fit for organizations that need postcode and locality services embedded into existing customer-facing or operational workflows rather than a standalone address-management interface.
The strongest case for UPU POST*CODE API is its narrow international focus: teams can work with postcode formats, locality relationships, validation and autocomplete in one service. It is a suitable choice for postal organizations and software providers serving multiple countries, especially where postcode-locality matching is central to address capture. Organizations looking for broader address correction, standardization or batch-validation workflows should compare alternatives that explicitly center those capabilities. Buyers should also account for the contact-sales purchasing process when evaluating fit and implementation planning.
UPU POST*CODE API pros and cons
- Where it wins
- Global postcode and locality validation across UPU member countries
- Autocomplete, matching and lookup tools for postcode workflows
- SDKs and plugins for postal, customs and e-commerce applications
- Where it doesn't
- Pricing is arranged through contact with the UPU
- Its focus is postcode and locality verification rather than broad address tooling
- Batch-validation and core correction capabilities are not part of the documented focus
UPU POST*CODE API fact sheet, pricing and score →
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