diff --git a/constants.ts b/constants.ts
new file mode 100644
index 00000000000..6d9fe24685b
--- /dev/null
+++ b/constants.ts
@@ -0,0 +1,4 @@
+export const CHAINS = {
+  BASE_SEPOLIA: 84532,
+  BASE: 8453,
+};
diff --git a/example.env.local b/example.env.local
new file mode 100644
index 00000000000..90ea64f2788
--- /dev/null
+++ b/example.env.local
@@ -0,0 +1,3 @@
+NEXT_PUBLIC_RPC_URL_BASE_SEPOLIA=https://base-sepolia.g.alchemy.com/v2/REPLACE_ME
+NEXT_PUBLIC_CHAIN_ID=84532
+NEXT_PUBLIC_GREETER_ADDRESS=0x0000000000000000000000000000000000000000