diff --git a/xmtp_id/src/scw_verifier/chain_urls_default.json b/xmtp_id/src/scw_verifier/chain_urls_default.json
index 47f07c32b..c3a1edebe 100644
--- a/xmtp_id/src/scw_verifier/chain_urls_default.json
+++ b/xmtp_id/src/scw_verifier/chain_urls_default.json
@@ -1,9 +1,9 @@
 {
-  "1": "https://eth.llamarpc.com",
-  "10": "https://rpc.ankr.com/optimism",
-  "137": "https://polygon.llamarpc.com",
-  "324": "https://mainnet.era.zksync.io",
-  "8453": "https://base.llamarpc.com",
-  "42161": "https://arbitrum.llamarpc.com",
-  "59144": "https://linea-rpc.publicnode.com"
+  "eip155:1": "https://eth.llamarpc.com",
+  "eip155:10": "https://rpc.ankr.com/optimism",
+  "eip155:137": "https://polygon.llamarpc.com",
+  "eip155:324": "https://mainnet.era.zksync.io",
+  "eip155:8453": "https://base.llamarpc.com",
+  "eip155:42161": "https://arbitrum.llamarpc.com",
+  "eip155:59144": "https://linea-rpc.publicnode.com"
 }
diff --git a/xmtp_id/src/scw_verifier/mod.rs b/xmtp_id/src/scw_verifier/mod.rs
index 002491151..eb7116abc 100644
--- a/xmtp_id/src/scw_verifier/mod.rs
+++ b/xmtp_id/src/scw_verifier/mod.rs
@@ -117,7 +117,12 @@ impl MultiSmartContractSignatureVerifier {
     /// Upgrade the default urls to paid/private/alternative urls if the env vars are present.
     pub fn upgrade(mut self) -> Self {
         self.verifiers.iter_mut().for_each(|(id, verif)| {
-            if let Ok(url) = env::var(format!("CHAIN_RPC_{id}")) {
+            // TODO: coda - update the chain id env var ids to preceeded with "EIP155_"
+            let eip_id = id
+                .split(":")
+                .nth(1)
+                .expect("All chain ids are preceeded with 'eip155:' for now.");
+            if let Ok(url) = env::var(format!("CHAIN_RPC_{eip_id}")) {
                 *verif = Box::new(RpcSmartContractWalletVerifier::new(url));
             } else {
                 info!("No upgraded chain url for chain {id}, using default.");