The free plan enables you to add the Addressfinder widget to your public-facing website. This gives you access to make address lookups and collect accurate address data as well as metadata associated with the collected address.
The rules of the free plan:
A limited number of address lookups per calendar month
Must be used in conjunction with the Addressfinder widget (no access to APIs)
Must display the Addressfinder footer and link in the dropdown address results
Is only to be used on public facing websites and forms