diff --git a/nimbus_verified_proxy/types.nim b/nimbus_verified_proxy/types.nim
index e45bd9dc42..f34e27bbf5 100644
--- a/nimbus_verified_proxy/types.nim
+++ b/nimbus_verified_proxy/types.nim
@@ -70,6 +70,10 @@ type
     filter*: FilterOptions
     blockMarker*: Opt[Quantity]
 
+  # TODO: Differentiate errors
+  VerifiedProxyError = enum
+    ValidationError
+
   VerifiedRpcProxy* = ref object
     evm*: AsyncEvm
     proxy*: RpcProxy