Calisphere Solr API deprecation in February 2024

Posted about 1 month ago by Christine Kim

Christine Kim Admin

This service update will impact anyone who has requested and received a unique Calisphere Solr API key, which provides access to data in the Solr index that underlies the Calisphere website.

Over the course of last year, we have been developing new infrastructure for Calisphere. In February 2024, we will transition into the new infrastructure, which will use OpenSearch as the underlying index. At that time, we will be deprecating the legacy Solr index and associated API.

Following our transition to our new indexing platform, we will begin to develop an updated strategy to provide programmatic access to Calisphere data. We will continue to provide follow-up updates on this page, as we identify options.

In the meantime, we continue to share Calisphere data with the Digital Public Library of America (DPLA) on a bi-annual basis. DPLA maintains an API (and static data file) of content in their aggregation (, which you can also feel free to utilize. DPLA’s latest snapshot of Calisphere data is from November 2023.

Please feel free to contact us if you have any questions. Thanks!

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