diff --git a/src/ckpool.h b/src/ckpool.h
index 0921496..58fbc95 100644
--- a/src/ckpool.h
+++ b/src/ckpool.h
@@ -394,7 +394,20 @@ struct apimsg {
 static inline void ckpool_api(ckpool_t __maybe_unused *ckp, apimsg_t __maybe_unused *apimsg) {};
 static inline json_t *json_encode_errormsg(json_error_t __maybe_unused *err_val) { return NULL; };
 static inline json_t *json_errormsg(const char __maybe_unused *fmt, ...) { return NULL; };
-static inline void send_api_response(json_t __maybe_unused *val, const int __maybe_unused sockd) {};
+
+/* Send a JSON value as a length-prefixed unix message so that external
+ * tools (kamado-api) can query live pool/user/worker stats via the
+ * stratifier socket.  The caller (stratum_loop retry:) closes sockd. */
+static inline void send_api_response(json_t *val, const int sockd)
+{
+	char *response;
+
+	response = json_dumps(val, JSON_NO_UTF8 | JSON_PRESERVE_ORDER);
+	json_decref(val);
+	if (response)
+		send_unix_msg(sockd, response);
+	free(response);
+}
 
 /* Subclients have client_ids in the high bits. Returns the value of the parent
  * client if one exists. */