diff --git a/.env.example b/.env.example
index 6a518dd9..d06daa43 100644
--- a/.env.example
+++ b/.env.example
@@ -24,19 +24,23 @@ PUBLIC_WALLETCONNECT_PROJECT_ID=''
 # Native token address
 PUBLIC_NATIVE_TOKEN_ADDRESS=0x0000000000000000000000000000000000000000
 
-# RPCs. Complete if you want to use a different RPC from the one provided by wagmi.
+# RPCs. Use these to override the default RPC for each chain.
+#
+# Configured in src/lib/networks.config.ts -- fall back to CORS-friendly publicnode.com RPCs when unset:
+PUBLIC_RPC_MAINNET=
 PUBLIC_RPC_ARBITRUM=
+PUBLIC_RPC_OPTIMISM=
+PUBLIC_RPC_OPTIMISM_SEPOLIA=
+PUBLIC_RPC_POLYGON=
+PUBLIC_RPC_SEPOLIA=
+#
+# Not configured by default -- add them to src/lib/networks.config.ts first, then set the RPC here:
 PUBLIC_RPC_ARBITRUM_SEPOLIA=
 PUBLIC_RPC_BASE=
 PUBLIC_RPC_BASE_SEPOLIA=
 PUBLIC_RPC_GNOSIS=
 PUBLIC_RPC_GNOSIS_CHIADO=
-PUBLIC_RPC_MAINNET=
-PUBLIC_RPC_OPTIMISM=
-PUBLIC_RPC_OPTIMISM_SEPOLIA=
-PUBLIC_RPC_POLYGON=
 PUBLIC_RPC_POLYGON_MUMBAI=
-PUBLIC_RPC_SEPOLIA=
 
 # Subgraph
 ###########################################################
diff --git a/src/lib/networks.config.ts b/src/lib/networks.config.ts
index 9bcc8f86..f1f8c0d5 100644
--- a/src/lib/networks.config.ts
+++ b/src/lib/networks.config.ts
@@ -18,10 +18,12 @@ export type ChainsIds = (typeof chains)[number]['id']
 
 type RestrictedTransports = Record<ChainsIds, Transport>
 export const transports: RestrictedTransports = {
-  [mainnet.id]: http(env.PUBLIC_RPC_MAINNET),
-  [arbitrum.id]: http(env.PUBLIC_RPC_ARBITRUM),
-  [optimism.id]: http(env.PUBLIC_RPC_OPTIMISM),
-  [optimismSepolia.id]: http(env.PUBLIC_RPC_OPTIMISM_SEPOLIA),
-  [polygon.id]: http(env.PUBLIC_RPC_POLYGON),
-  [sepolia.id]: http(env.PUBLIC_RPC_SEPOLIA),
+  [mainnet.id]: http(env.PUBLIC_RPC_MAINNET || 'https://ethereum-rpc.publicnode.com'),
+  [arbitrum.id]: http(env.PUBLIC_RPC_ARBITRUM || 'https://arbitrum-one-rpc.publicnode.com'),
+  [optimism.id]: http(env.PUBLIC_RPC_OPTIMISM || 'https://optimism-rpc.publicnode.com'),
+  [optimismSepolia.id]: http(
+    env.PUBLIC_RPC_OPTIMISM_SEPOLIA || 'https://optimism-sepolia-rpc.publicnode.com',
+  ),
+  [polygon.id]: http(env.PUBLIC_RPC_POLYGON || 'https://polygon-bor-rpc.publicnode.com'),
+  [sepolia.id]: http(env.PUBLIC_RPC_SEPOLIA || 'https://ethereum-sepolia-rpc.publicnode.com'),
 }