Google and the Census both don't require individual users to signup to access their data. However, both require that their users signup for an API key to do au

Google and the Census both don't require individual users to signup to access their data. However, both require that their users signup for an API key to do automated querying. (In fact, Google charges for its Web Search API now.) It's pretty standard for any API to want to be able to identify and potentially meter usage.