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diff --git a/src/cpp/ext/filters/census/grpc_plugin.h b/src/cpp/ext/filters/census/grpc_plugin.h
new file mode 100644
index 0000000000..7ff2e7a8b8
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+++ b/src/cpp/ext/filters/census/grpc_plugin.h
@@ -0,0 +1,111 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_GRPC_PLUGIN_H
+#define GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_GRPC_PLUGIN_H
+
+#include <grpc/support/port_platform.h>
+
+#include "absl/strings/string_view.h"
+#include "include/grpcpp/opencensus.h"
+#include "opencensus/stats/stats.h"
+#include "opencensus/trace/span.h"
+
+namespace grpc {
+
+class ServerContext;
+
+// Returns the tracing Span for the current RPC.
+::opencensus::trace::Span GetSpanFromServerContext(ServerContext* context);
+
+// The tag keys set when recording RPC stats.
+::opencensus::stats::TagKey ClientMethodTagKey();
+::opencensus::stats::TagKey ClientStatusTagKey();
+::opencensus::stats::TagKey ServerMethodTagKey();
+::opencensus::stats::TagKey ServerStatusTagKey();
+
+// Names of measures used by the plugin--users can create views on these
+// measures but should not record data for them.
+extern const absl::string_view kRpcClientSentMessagesPerRpcMeasureName;
+extern const absl::string_view kRpcClientSentBytesPerRpcMeasureName;
+extern const absl::string_view kRpcClientReceivedMessagesPerRpcMeasureName;
+extern const absl::string_view kRpcClientReceivedBytesPerRpcMeasureName;
+extern const absl::string_view kRpcClientRoundtripLatencyMeasureName;
+extern const absl::string_view kRpcClientServerLatencyMeasureName;
+
+extern const absl::string_view kRpcServerSentMessagesPerRpcMeasureName;
+extern const absl::string_view kRpcServerSentBytesPerRpcMeasureName;
+extern const absl::string_view kRpcServerReceivedMessagesPerRpcMeasureName;
+extern const absl::string_view kRpcServerReceivedBytesPerRpcMeasureName;
+extern const absl::string_view kRpcServerServerLatencyMeasureName;
+
+// Canonical gRPC view definitions.
+const ::opencensus::stats::ViewDescriptor& ClientSentMessagesPerRpcCumulative();
+const ::opencensus::stats::ViewDescriptor& ClientSentBytesPerRpcCumulative();
+const ::opencensus::stats::ViewDescriptor&
+ClientReceivedMessagesPerRpcCumulative();
+const ::opencensus::stats::ViewDescriptor&
+ClientReceivedBytesPerRpcCumulative();
+const ::opencensus::stats::ViewDescriptor& ClientRoundtripLatencyCumulative();
+const ::opencensus::stats::ViewDescriptor& ClientServerLatencyCumulative();
+const ::opencensus::stats::ViewDescriptor& ClientCompletedRpcsCumulative();
+
+const ::opencensus::stats::ViewDescriptor& ServerSentBytesPerRpcCumulative();
+const ::opencensus::stats::ViewDescriptor&
+ServerReceivedBytesPerRpcCumulative();
+const ::opencensus::stats::ViewDescriptor& ServerServerLatencyCumulative();
+const ::opencensus::stats::ViewDescriptor& ServerStartedCountCumulative();
+const ::opencensus::stats::ViewDescriptor& ServerCompletedRpcsCumulative();
+const ::opencensus::stats::ViewDescriptor& ServerSentMessagesPerRpcCumulative();
+const ::opencensus::stats::ViewDescriptor&
+ServerReceivedMessagesPerRpcCumulative();
+
+const ::opencensus::stats::ViewDescriptor& ClientSentMessagesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ClientSentBytesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ClientReceivedMessagesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ClientReceivedBytesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ClientRoundtripLatencyMinute();
+const ::opencensus::stats::ViewDescriptor& ClientServerLatencyMinute();
+const ::opencensus::stats::ViewDescriptor& ClientCompletedRpcsMinute();
+
+const ::opencensus::stats::ViewDescriptor& ServerSentMessagesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ServerSentBytesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ServerReceivedMessagesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ServerReceivedBytesPerRpcMinute();
+const ::opencensus::stats::ViewDescriptor& ServerServerLatencyMinute();
+const ::opencensus::stats::ViewDescriptor& ServerCompletedRpcsMinute();
+
+const ::opencensus::stats::ViewDescriptor& ClientSentMessagesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ClientSentBytesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ClientReceivedMessagesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ClientReceivedBytesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ClientRoundtripLatencyHour();
+const ::opencensus::stats::ViewDescriptor& ClientServerLatencyHour();
+const ::opencensus::stats::ViewDescriptor& ClientCompletedRpcsHour();
+
+const ::opencensus::stats::ViewDescriptor& ServerSentMessagesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ServerSentBytesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ServerReceivedMessagesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ServerReceivedBytesPerRpcHour();
+const ::opencensus::stats::ViewDescriptor& ServerServerLatencyHour();
+const ::opencensus::stats::ViewDescriptor& ServerStartedCountHour();
+const ::opencensus::stats::ViewDescriptor& ServerCompletedRpcsHour();
+
+}  // namespace grpc
+
+#endif /* GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_GRPC_PLUGIN_H */