diff --git a/scripts/check_env.sh b/scripts/check_env.sh
new file mode 100644
index 000000000..26925c3f2
--- /dev/null
+++ b/scripts/check_env.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ENV_FILE="${1:-.env.mainnet}"
+
+if [ ! -f "$ENV_FILE" ]; then
+  echo "ERROR: Env file not found: $ENV_FILE"
+  exit 1
+fi
+
+required_keys=("HOST_DATA_DIR")
+
+missing=0
+for key in "${required_keys[@]}"; do
+  if ! grep -qE "^${key}=" "$ENV_FILE"; then
+    echo "Missing required key: ${key}"
+    missing=1
+  fi
+done
+
+if [ "$missing" -ne 0 ]; then
+  exit 1
+fi
+
+echo "Env check passed."