OpenPAQ (Open Postal Address Quality) is a tool designed to validate key components of postal addresses, ensuring data accuracy and integrity. A core capability of OpenPAQ is the normalization of addresses as they are found "in the wild." It transforms diverse and inconsistent address inputs into a standardized format that is valid for performing checks against the OpenStreetMap database.

Operating via a simple HTTP-Endpoint, OpenPAQ leverages Nominatim in the background to perform its checks. It is tested against a self-hosted Nominatim version from mediagis..

OpenPAQ checks the following address components:

• street
• city
• postal code
• country code

Key Features of OpenPAQ:

OpenPAQ offers the following capabilities in address validation, measured with an internal benchmark of 90 correct and 40 incorrect postal addresses per country:

1. International Address Validation: Provides address validation with accuracy levels of approximately 80% or higher for key European countries (DE, NL, AT, CH, FR, GB, IT, PL, DK)
2. Correct Address Identification: Achieves a recall rate of approximately 75% or higher for most benchmarked countries in identifying correct addresses.
3. Incorrect Address Detection: Offers an F1 score of over 75% for most benchmarked countries in identifying incorrect addresses.

Please have a look at the documentation for a detailed description of the program.