The StreetCheck API is designed for users who want full access to the underlying data that we have pulled together. Just about every piece of information that we have about the UK's postcodes is available through the API.
This guide is designed to get you up to speed quickly with the available data endpoints and how you can gain secure access to them.
Our API is a paid-for service. Users of the API will be charged a half penny per lookup, which is billed at the end of each month based on usage. We have test "sandbox" logins available for those looking to try before they commit financially, which allows unlimited free access to a subset of the postcodes. More information on this is available in the next section.