diff --git a/bin/check_rpc_connectivity.sh b/bin/check_rpc_connectivity.sh
new file mode 100644
index 00000000..93164d2d
--- /dev/null
+++ b/bin/check_rpc_connectivity.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Check connectivity to L1 and OP node JSON-RPC endpoints.
+# Usage: BASE_L1_RPC_URL=http://localhost:8545 BASE_OP_RPC_URL=http://localhost:9000 ./bin/check_rpc_connectivity.sh
+
+L1_URL="${BASE_L1_RPC_URL:-http://localhost:8545}"
+OP_URL="${BASE_OP_RPC_URL:-http://localhost:9000}"
+
+check_rpc() {
+  local url="$1"
+  local name="$2"
+  echo "Checking $name RPC at $url ..."
+  if curl -s -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' "$url" >/dev/null; then
+    echo "  $name RPC is reachable."
+  else
+    echo "  Failed to reach $name RPC."
+  fi
+}
+
+check_rpc "$L1_URL" "L1"
+check_rpc "$OP_URL" "OP node"