Added blockmachine

Author: Danielvul

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

@@ -196,3 +196,13 @@ import {HeaderNoToc} from "/snippets/headerNoToc.mdx";
 
 - Base Mainnet
 
+## Blockmachine
+
+[Blockmachine](https://blockmachine.io/base-rpc) offers some of the lowest Base RPC prices on the market, with a free keyless public endpoint and no signup required. Standard JSON-RPC, no proprietary extensions, no lock-in.
+
+See [pricing](https://blockmachine.io/pricing) and [Base RPC quickstart](https://blockmachine.io/docs/base-rpc).
+
+<HeaderNoToc title="Supported Networks"/>
+
+- Base Mainnet
+