IUCN Red List API v4

About the IUCN Red List of Threatened Species

For more information about the IUCN Red List of Threatened Species, please visit the IUCN Red List website.

The API outputs the same data which is from the IUCN Red List website.

The use of the API falls under the same Terms of Use of the Red List data.

How to cite the IUCN Red List API

Full acknowledgement and citation needs to be given for using the API, which is:

IUCN 2023. IUCN Red List of Threatened Species. Version 2023-1 <www.iucnredlist.org>

By making a request for a token, you are accepting to abide by the Terms of Use of the Red List. If such Terms of use are found not to be followed, the token will be disabled for use.

API Usage

We kindly request your cooperation in ensuring responsible and respectful usage of our services. Please be aware that misusing your API token, such as using it for information extraction (scraping) rather than making legitimate requests for non-commercial purposes, may result in your token being rate limited and/or revoked. We are committed to maintaining a high-quality service for all users, and we actively monitor API usage to prevent abuse. We value your support for conservation efforts and expect proper utilization of the API. Excessive and frequent calls or exceeding daily limits may lead to access restrictions.

We understand that some users may have unique requirements for making frequent calls in succession. If you find yourself in such a situation, we kindly request that you incorporate appropriate delays between your API calls to ensure smooth operation and prevent overloading our system, otherwise your token may be automatically rate-limited.

It's important to note that the Red List API is primarily designed to support conservation efforts, particularly in the fields of education and research. We may need to restrict access if the API is being used for purposes that do not align with our mission, such as mobile app development, inclusion in computing courses, or visualization projects unrelated to conservation. Use of the Red List API is strictly forbidden for commercial purposes. Users who wish to use Red List data for such purposes should consider subscribing to IBAT (www.ibat-alliance.org).

The API data is updated every time there is a new version of the Red List. Therefore, if you are going to be using the Red List data from the API very frequently, it is recommended that you actually store a copy within your systems (please check for permissions first by contacting the Red List), and then update your version whenever there is a new Red List Update.

Your cooperation is greatly appreciated as we work together to protect our natural world.


If you encounter any problems using the API, or would like to provide feedback of any kind, please contact the Red List team at redlist at iucn.org.