Surrey Digital Services have set up an address lookup API using OS AddressBase Premium and is available for use by PSMA signatories.
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API tokens can be granted to qualifying organisations via the token request form. Use of this data is subject to terms and conditions under the Public Sector Mapping Agreement
For more information on accessing the service please see the docs.
The Surrey Digital Services address API was forked from the Government Digital Service Locate API and was configured by Folk Labs.