adding link

Author: youssefea

docs/ai-agents/index.mdx

@@ -15,7 +15,7 @@ Base gives your AI agent the tools to operate as an independent economic actor:
 
 ### High-level flow
 
-Here's how the agent you can build from these guides operates end-to-end — from wallet setup and identity registration to making authenticated, paid API requests using the x402 protocol.
+Here's how the agent you can build from these guides operates end-to-end — from wallet setup and identity registration to making authenticated, paid API requests using the [x402 protocol](www.x402.org).
 
 ```mermaid
 sequenceDiagram