We encourage anyone interested in building tools to interoperate with the Dataverse to utilize our APIs. In 4.0, we require to get a token, by simply registering for a Dataverse account, before using our APIs (We are considering making some of the APIs completley public in the future - no token required - if you use it only a few times).
Rather than using a production installation of Dataverse, API users should use http://apitest.dataverse.org for testing.
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