diff --git a/README.md b/README.md
index 8d66f3f..d20d0ba 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ services that Aquila must implement as a server.
 │   ├── module - Module service to receive datatypes, functions and flow types from aquila
 │   ├── runtime_status - Service for runtime status (handles information about Draco and Taurus)
 │   ├── runtime_usage - Service for runtime usage (handles execution time of a flow)
-│   └── test_execution - Service and Types for the test execution├── sagittarius
+│   └── test_execution - Service and Types for the test execution
 ├── sagittarius_rails
 │   ├── flow - Flow service (handles flow updates)
 │   ├── module - Module service to receive datatypes, functions and flow types from aquila
diff --git a/proto/sagittarius_gateway/sagittarius_gateway.runtime_usage.proto b/proto/sagittarius_gateway/sagittarius_gateway.runtime_usage.proto
new file mode 100644
index 0000000..011bffc
--- /dev/null
+++ b/proto/sagittarius_gateway/sagittarius_gateway.runtime_usage.proto
@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+package sagittarius_gateway;
+
+import "shared.errors.proto";
+import "shared.runtime_usage.proto";
+
+option ruby_package = "Tucana::Sagittarius::Gateway";
+
+message RuntimeUsageRequest {
+  repeated shared.RuntimeUsage runtime_usage = 1;
+}
+
+message RuntimeUsageResponse {
+  bool success = 1;
+  optional shared.ServiceError error = 2;
+}
+
+service RuntimeUsageService {
+  rpc Update(RuntimeUsageRequest) returns (RuntimeUsageResponse) {}
+}
diff --git a/proto/sagittarius_rails/sagittarius_rails.runtime_usage.proto b/proto/sagittarius_rails/sagittarius_rails.runtime_usage.proto
new file mode 100644
index 0000000..293f010
--- /dev/null
+++ b/proto/sagittarius_rails/sagittarius_rails.runtime_usage.proto
@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+package sagittarius_rails;
+
+import "shared.errors.proto";
+import "shared.runtime_usage.proto";
+
+option ruby_package = "Tucana::Sagittarius::Rails";
+
+message RuntimeUsageRequest {
+  repeated shared.RuntimeUsage runtime_usage = 1;
+}
+
+message RuntimeUsageResponse {
+  bool success = 1;
+  optional shared.ServiceError error = 2;
+}
+
+service RuntimeUsageService {
+  rpc Update(RuntimeUsageRequest) returns (RuntimeUsageResponse) {}
+}
diff --git a/proto/shared/shared.runtime_usage.proto b/proto/shared/shared.runtime_usage.proto
new file mode 100644
index 0000000..441a216
--- /dev/null
+++ b/proto/shared/shared.runtime_usage.proto
@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+package shared;
+
+option ruby_package = "Tucana::Shared";
+
+message RuntimeUsage {
+  int64 flow_id = 1;
+  int64 duration = 2;
+}