replace with attribution link (#1235)

Author: roethke

docs/base-chain/node-operators/node-providers.mdx

@@ -24,7 +24,7 @@ import {HeaderNoToc} from "/snippets/headerNoToc.mdx";
 
 ## Alchemy
 
-[Alchemy](https://www.alchemy.com/base) is a popular API provider and developer platform. Its robust, free tier offers access to enhanced features like SDKs, [JSON-RPC APIs](https://docs.alchemy.com/reference/base-api-quickstart), and hosted mainnet and testnet nodes for Base.
+[Alchemy](https://dashboard.alchemy.com/?utm_source=chain_partner&utm_medium=referral&utm_campaign=base) is a popular API provider and developer platform. Its robust, free tier offers access to enhanced features like SDKs, [JSON-RPC APIs](https://docs.alchemy.com/reference/base-api-quickstart), and hosted mainnet and testnet nodes for Base.
 
 <HeaderNoToc title="Supported Networks"/>