diff --git a/include/monitor.h b/include/monitor.h
new file mode 100644
index 0000000..bc2a9d9
--- /dev/null
+++ b/include/monitor.h
@@ -0,0 +1,13 @@
+#ifndef MONITOR_H
+#define MONITOR_H
+#include "telemetry.h"
+#include <stdint.h>
+typedef struct {
+    uint32_t accepted, rejected, duplicate, rollback, lost;
+    uint16_t last_sequence;
+    int has_last;
+    sample_t last_sample;
+} monitor_t;
+void monitor_init(monitor_t *monitor);
+frame_result_t monitor_accept(monitor_t *monitor, const uint8_t *bytes, size_t length);
+#endif