Different public administrations started publishing Linked Data Event Streams as the core API of their publishing strategy. This allows third parties to replicate the full Linked Data dataset and keep it in sync afterwards. However, that is not where it stops: it bootstraps an ecosystem of reusable indexes on top of the main event stream. In this course you will learn how to use LDES as a way to prioritize Web API features for your data publishing strategy. Next, we will deep-dive into the LDES and TREE specifications theoretically and understand what they allow. Then we will learn from three existing implementations how they turned their existing data publishing into a Linked Data Event Stream, and finally, we will show how you can reuse these new Web APIs as a data consumer.