diff --git a/src/getChainId.ts b/src/getChainId.ts
new file mode 100644
index 0000000..62e2169
--- /dev/null
+++ b/src/getChainId.ts
@@ -0,0 +1,22 @@
+import networks from "./networks";
+
+export const getChainId = (chainNameOrAlias: string): number | null => {
+  if (networks.hasOwnProperty(chainNameOrAlias)) {
+    return networks[chainNameOrAlias as keyof typeof networks].chain_id;
+  }
+
+  // Iterate through networks to check aliases
+  for (const key in networks) {
+    if (networks.hasOwnProperty(key)) {
+      const chain: any = networks[key as keyof typeof networks];
+      if (
+        chain.chain_aliases &&
+        chain.chain_aliases.includes(chainNameOrAlias)
+      ) {
+        return chain.chain_id;
+      }
+    }
+  }
+
+  return null;
+};
diff --git a/src/index.ts b/src/index.ts
index fd78853..e9b3d10 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,6 +2,7 @@ export * from "./getEndpoints";
 export * from "./getExplorers";
 export * from "./getSupportedNetworks";
 export * from "./getNetworkName";
-export { default as networks } from "./networks";
+export * from "./getChainId";
 
+export { default as networks } from "./networks";
 export { default as getHardhatConfigNetworks } from "./getHardhatConfigNetworks";