diff --git a/content/api-reference/data/data-overview.mdx b/content/api-reference/data/data-overview.mdx
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--- a/content/api-reference/data/data-overview.mdx
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@@ -9,6 +9,10 @@ hide-toc: true
 
 The Data APIs give you fast, reliable access to blockchain data without running your own indexing infrastructure. Whether you're building wallets, NFT platforms, analytics dashboards, or DeFi apps, the Data APIs save you time and engineering costs by offering pre-transformed, production-ready data.
 
+<Tip>
+  **Migrating from Sim?** Dune is retiring the Sim API on August 1, 2026. See our [Sim to Alchemy Data APIs migration guide](https://www.alchemy.com/blog/migrating-from-sim-to-alchemy-data-apis) for endpoint mappings, auth and pagination changes, and a four-step walkthrough.
+</Tip>
+
 ## Components of the Data APIs
 
 <CardGroup cols={3}>