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diff --git a/src/core/statistics/census_rpc_stats.h b/src/core/statistics/census_rpc_stats.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __GRPC_INTERNAL_STATISTICS_CENSUS_RPC_STATS_H__
+#define __GRPC_INTERNAL_STATISTICS_CENSUS_RPC_STATS_H__
+
+#include "src/core/statistics/census_interface.h"
+#include <grpc/support/port_platform.h>
+
+struct census_rpc_stats {
+  gpr_uint64 cnt;
+  gpr_uint64 rpc_error_cnt;
+  gpr_uint64 app_error_cnt;
+  double elapsed_time_ms;
+  double api_request_bytes;
+  double wire_request_bytes;
+  double api_response_bytes;
+  double wire_response_bytes;
+};
+
+/* Creates an empty rpc stats object on heap. */
+census_rpc_stats* census_rpc_stats_create_empty();
+
+typedef struct census_per_service_per_method_rpc_stats {
+  const char* service;
+  const char* method;
+  census_rpc_stats data;
+} census_per_service_per_method_rpc_stats;
+
+typedef struct census_aggregated_rpc_stats {
+  int num_entries;
+  census_per_service_per_method_rpc_stats* stats;
+} census_aggregated_rpc_stats;
+
+/* Deletes aggregated data. */
+void census_aggregated_rpc_stats_destroy(census_aggregated_rpc_stats* data);
+
+/* Records client side stats of a rpc. */
+void census_record_rpc_client_stats(census_op_id op_id,
+                                    const census_rpc_stats* stats);
+
+/* Records server side stats of a rpc. */
+void census_record_rpc_server_stats(census_op_id op_id,
+                                    const census_rpc_stats* stats);
+
+/* The following two functions are intended for inprocess query of
+   per-service per-method stats from grpc implementations. */
+
+/* Populates *data_map with server side aggregated per-service per-method
+   stats.
+   DO NOT CALL from outside of grpc code. */
+void census_get_server_stats(census_aggregated_rpc_stats* data_map);
+
+/* Populates *data_map with client side aggregated per-service per-method
+   stats.
+   DO NOT CALL from outside of grpc code. */
+void census_get_client_stats(census_aggregated_rpc_stats* data_map);
+
+#endif  /* __GRPC_INTERNAL_STATISTICS_CENSUS_RPC_STATS_H__ */