diff --git a/odpf/stencil/v1/stencil.proto b/odpf/stencil/v1/stencil.proto
new file mode 100644
index 00000000..227a399a
--- /dev/null
+++ b/odpf/stencil/v1/stencil.proto
@@ -0,0 +1,109 @@
+syntax = "proto3";
+package odpf.stencil.v1;
+
+import "google/api/annotations.proto";
+import "google/api/field_behavior.proto";
+import "google/protobuf/descriptor.proto";
+import "protoc-gen-openapiv2/options/annotations.proto";
+
+
+option go_package = "github.com/odpf/proton/stencil/v1;stencilv1";
+
+// These annotations are used when generating the OpenAPI file.
+option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_swagger) = {
+	info: {
+		version: "0.1.4";
+	};
+	schemes: HTTP;
+};
+
+service StencilService {
+	rpc UploadDescriptor (UploadDescriptorRequest) returns (UploadDescriptorResponse) {
+		option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+			consumes: "multipart/form-data";
+			produces: "application/json";
+		};
+	}
+	rpc DownloadDescriptor (DownloadDescriptorRequest) returns (DownloadDescriptorResponse) {
+		option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+			produces: "application/octet-stream";
+		};
+	}
+	rpc ListSnapshots(ListSnapshotsRequest) returns (ListSnapshotsResponse) {
+		option (google.api.http) = {
+			get: "/v1/snapshots"
+		};
+	}
+	// PromoteSnapshot promotes particular snapshot version as latest
+	rpc PromoteSnapshot(PromoteSnapshotRequest) returns (PromoteSnapshotResponse) {
+		option (google.api.http) = {
+			patch: "/v1/snapshots/{id}/promote"
+		};
+	}
+}
+
+enum Rule {
+	UNKNOWN = 0;
+	FILE_NO_BREAKING_CHANGE = 1;
+	MESSAGE_NO_DELETE = 2;
+	FIELD_NO_BREAKING_CHANGE = 3;
+	ENUM_NO_BREAKING_CHANGE = 4;
+}
+
+message Snapshot {
+	int64 id = 1;
+	string namespace = 2 [(google.api.field_behavior) = REQUIRED];
+	string name = 3;
+	string version = 4;
+	bool latest = 5;
+}
+
+message DownloadDescriptorRequest {
+	string namespace = 1 [(google.api.field_behavior) = REQUIRED];
+	string name = 2 [(google.api.field_behavior) = REQUIRED];
+	string version = 3 [(google.api.field_behavior) = REQUIRED];
+	repeated string fullnames = 4;
+}
+
+message DownloadDescriptorResponse {
+	bytes data = 1;
+}
+
+message UploadDescriptorRequest {
+	string namespace = 1 [(google.api.field_behavior) = REQUIRED];
+	string name = 2 [(google.api.field_behavior) = REQUIRED];
+	string version = 3 [(google.api.field_behavior) = REQUIRED];
+	bytes data = 4 [(google.api.field_behavior) = REQUIRED];
+	bool latest = 5;
+	bool dryrun = 6;
+	Checks checks = 7;
+}
+
+message Checks {
+	repeated Rule except = 2;
+}
+
+message UploadDescriptorResponse {
+	bool success = 1;
+	bool dryrun = 2;
+	string errors = 3;
+}
+
+message ListSnapshotsResponse {
+	repeated Snapshot snapshots = 1;
+}
+
+message ListSnapshotsRequest {
+	string namespace = 1;
+	string name = 2;
+	string version = 3;
+	bool latest = 4;
+}
+
+message PromoteSnapshotRequest {
+	int64 id = 1;
+}
+
+message PromoteSnapshotResponse {
+	Snapshot snapshot = 1;
+}