You do not need to authenticate in order to explore the WorldPop data via REST API. We apply the following rate-limits: 1000 API calls per day without API key.

If you anticipate that your API call volume will exceed the above rate-limits, please follow steps below to request an API key:

• To request an API Key, go to the WorldPop site. If you have already registered as a user, login. If not, register as a new user – you cannot request API Keys until you are registered as a user.
• Once you are logged in, go to the API section and you will see options to request an API Key.

Once you have submitted a request we will reply by email within one week, either approving or rejecting your request. If your request is rejected please check that you followed all the guidelines in the request form. If you find you made an error or left out a detail that caused your request to be denied, you may update your application and re-submit it. We will then review the API key request one more time.

For questions or comments about accessing WorldPop REST API, please contact info@worldpop.org