diff --git a/README.md b/README.md
index 2918029..5493d74 100644
--- a/README.md
+++ b/README.md
@@ -120,6 +120,17 @@ An open-source observability platform for GPT-3. Allows to track usage, costs, a
 
 
 
+</details>
+
+## [Hashgraph Online (HOL)](https://hol.org/)
+Universal registry and trust engine for AI agents. Bridges A2A, MCP, Virtuals, ERC-8004, x402, OpenConvAI, and NANDA protocols with official SDKs in TypeScript, Go, and Python.
+
+<details>
+
+### Links
+- [Web](https://hol.org/)
+- [GitHub](https://github.com/hashgraph-online)
+
 </details>
 
 ## [Langchain](https://www.langchain.com/)