diff --git a/pkg/interop/storage/limits.go b/pkg/interop/storage/limits.go
new file mode 100644
index 000000000..70cf266d7
--- /dev/null
+++ b/pkg/interop/storage/limits.go
@@ -0,0 +1,12 @@
+package storage
+
+// Contract storage limits.
+const (
+	// MaxKeyLen is the maximum length of a key for storage items.
+	// Contracts can't use keys longer than that in their requests to the DB.
+	MaxKeyLen = 64
+	// MaxValueLen is the maximum length of a value for storage items.
+	// It is set to be the maximum value for uint16, contracts can't put
+	// values longer than that into the DB.
+	MaxValueLen = 65535
+)