diff --git a/Makefile b/Makefile
index db6a2a57..24c15447 100644
--- a/Makefile
+++ b/Makefile
@@ -49,6 +49,7 @@ proto: \
 	plugin/types/types.pb.go \
 	builtin/types/coin/coin.pb.go \
 	builtin/types/dpos/dpos.pb.go \
+	builtin/types/cron/cron.pb.go \
 	testdata/test.pb.go \
 	examples/types/types.pb.go \
 	examples/plugins/lottery/lottery.pb.go \
diff --git a/builtin/types/cron/cron.pb.go b/builtin/types/cron/cron.pb.go
new file mode 100644
index 00000000..0a8b80c4
--- /dev/null
+++ b/builtin/types/cron/cron.pb.go
@@ -0,0 +1,180 @@
+// Code generated by protoc-gen-gogo. DO NOT EDIT.
+// source: github.com/loomnetwork/go-loom/builtin/types/cron/cron.proto
+
+/*
+Package cron is a generated protocol buffer package.
+
+It is generated from these files:
+	github.com/loomnetwork/go-loom/builtin/types/cron/cron.proto
+
+It has these top-level messages:
+	CronJob
+	InitCronRequest
+	AddCronRequest
+	AddCronResponse
+	ListCronRequest
+	ListCronResponse
+*/
+package cron
+
+import proto "github.com/gogo/protobuf/proto"
+import fmt "fmt"
+import math "math"
+import types "github.com/loomnetwork/go-loom/types"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.GoGoProtoPackageIsVersion2 // please upgrade the proto package
+
+type CronJob struct {
+	Owner    *types.Address `protobuf:"bytes,1,opt,name=owner" json:"owner,omitempty"`
+	Interval string         `protobuf:"bytes,2,opt,name=interval,proto3" json:"interval,omitempty"`
+}
+
+func (m *CronJob) Reset()                    { *m = CronJob{} }
+func (m *CronJob) String() string            { return proto.CompactTextString(m) }
+func (*CronJob) ProtoMessage()               {}
+func (*CronJob) Descriptor() ([]byte, []int) { return fileDescriptorCron, []int{0} }
+
+func (m *CronJob) GetOwner() *types.Address {
+	if m != nil {
+		return m.Owner
+	}
+	return nil
+}
+
+func (m *CronJob) GetInterval() string {
+	if m != nil {
+		return m.Interval
+	}
+	return ""
+}
+
+type InitCronRequest struct {
+	Cronjob []*CronJob `protobuf:"bytes,1,rep,name=cronjob" json:"cronjob,omitempty"`
+}
+
+func (m *InitCronRequest) Reset()                    { *m = InitCronRequest{} }
+func (m *InitCronRequest) String() string            { return proto.CompactTextString(m) }
+func (*InitCronRequest) ProtoMessage()               {}
+func (*InitCronRequest) Descriptor() ([]byte, []int) { return fileDescriptorCron, []int{1} }
+
+func (m *InitCronRequest) GetCronjob() []*CronJob {
+	if m != nil {
+		return m.Cronjob
+	}
+	return nil
+}
+
+type AddCronRequest struct {
+	Cronjob *CronJob `protobuf:"bytes,1,opt,name=cronjob" json:"cronjob,omitempty"`
+}
+
+func (m *AddCronRequest) Reset()                    { *m = AddCronRequest{} }
+func (m *AddCronRequest) String() string            { return proto.CompactTextString(m) }
+func (*AddCronRequest) ProtoMessage()               {}
+func (*AddCronRequest) Descriptor() ([]byte, []int) { return fileDescriptorCron, []int{2} }
+
+func (m *AddCronRequest) GetCronjob() *CronJob {
+	if m != nil {
+		return m.Cronjob
+	}
+	return nil
+}
+
+type AddCronResponse struct {
+	CronID uint32 `protobuf:"varint,1,opt,name=CronID,proto3" json:"CronID,omitempty"`
+	Error  string `protobuf:"bytes,2,opt,name=Error,proto3" json:"Error,omitempty"`
+}
+
+func (m *AddCronResponse) Reset()                    { *m = AddCronResponse{} }
+func (m *AddCronResponse) String() string            { return proto.CompactTextString(m) }
+func (*AddCronResponse) ProtoMessage()               {}
+func (*AddCronResponse) Descriptor() ([]byte, []int) { return fileDescriptorCron, []int{3} }
+
+func (m *AddCronResponse) GetCronID() uint32 {
+	if m != nil {
+		return m.CronID
+	}
+	return 0
+}
+
+func (m *AddCronResponse) GetError() string {
+	if m != nil {
+		return m.Error
+	}
+	return ""
+}
+
+type ListCronRequest struct {
+	Owner *types.Address `protobuf:"bytes,1,opt,name=owner" json:"owner,omitempty"`
+}
+
+func (m *ListCronRequest) Reset()                    { *m = ListCronRequest{} }
+func (m *ListCronRequest) String() string            { return proto.CompactTextString(m) }
+func (*ListCronRequest) ProtoMessage()               {}
+func (*ListCronRequest) Descriptor() ([]byte, []int) { return fileDescriptorCron, []int{4} }
+
+func (m *ListCronRequest) GetOwner() *types.Address {
+	if m != nil {
+		return m.Owner
+	}
+	return nil
+}
+
+type ListCronResponse struct {
+	Cronjob []*CronJob `protobuf:"bytes,1,rep,name=cronjob" json:"cronjob,omitempty"`
+}
+
+func (m *ListCronResponse) Reset()                    { *m = ListCronResponse{} }
+func (m *ListCronResponse) String() string            { return proto.CompactTextString(m) }
+func (*ListCronResponse) ProtoMessage()               {}
+func (*ListCronResponse) Descriptor() ([]byte, []int) { return fileDescriptorCron, []int{5} }
+
+func (m *ListCronResponse) GetCronjob() []*CronJob {
+	if m != nil {
+		return m.Cronjob
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*CronJob)(nil), "CronJob")
+	proto.RegisterType((*InitCronRequest)(nil), "InitCronRequest")
+	proto.RegisterType((*AddCronRequest)(nil), "AddCronRequest")
+	proto.RegisterType((*AddCronResponse)(nil), "AddCronResponse")
+	proto.RegisterType((*ListCronRequest)(nil), "ListCronRequest")
+	proto.RegisterType((*ListCronResponse)(nil), "ListCronResponse")
+}
+
+func init() {
+	proto.RegisterFile("github.com/loomnetwork/go-loom/builtin/types/cron/cron.proto", fileDescriptorCron)
+}
+
+var fileDescriptorCron = []byte{
+	// 259 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x90, 0x4d, 0x4b, 0x03, 0x31,
+	0x10, 0x86, 0x89, 0xd2, 0x0f, 0x47, 0x74, 0x25, 0x88, 0x2c, 0x3d, 0xc8, 0x92, 0x53, 0x2f, 0x6e,
+	0xfc, 0x3e, 0x09, 0x52, 0xb4, 0x87, 0x8a, 0xa7, 0xfc, 0x03, 0xd3, 0x0d, 0x35, 0xba, 0xcd, 0xac,
+	0x93, 0xac, 0xc5, 0x7f, 0x2f, 0x9b, 0x5d, 0x2b, 0x82, 0x52, 0x2f, 0x03, 0x4f, 0xc2, 0x33, 0xf3,
+	0xce, 0xc0, 0xcd, 0xc2, 0x86, 0xe7, 0x5a, 0xe7, 0x73, 0x5c, 0xca, 0x12, 0x71, 0xe9, 0x4c, 0x58,
+	0x21, 0xbd, 0xca, 0x05, 0x9e, 0x34, 0x28, 0x75, 0x6d, 0xcb, 0x60, 0x9d, 0x0c, 0x1f, 0x95, 0xf1,
+	0x72, 0x4e, 0xe8, 0x62, 0xc9, 0x2b, 0xc2, 0x80, 0xa3, 0xd3, 0x0d, 0x76, 0x6b, 0xc5, 0xda, 0x1a,
+	0x62, 0x0a, 0x83, 0x3b, 0x42, 0xf7, 0x80, 0x9a, 0x1f, 0x43, 0x0f, 0x57, 0xce, 0x50, 0xca, 0x32,
+	0x36, 0xde, 0x3d, 0x1f, 0xe6, 0x93, 0xa2, 0x20, 0xe3, 0xbd, 0x6a, 0x9f, 0xf9, 0x08, 0x86, 0xd6,
+	0x05, 0x43, 0xef, 0x4f, 0x65, 0xba, 0x95, 0xb1, 0xf1, 0x8e, 0x5a, 0xb3, 0xb8, 0x82, 0x64, 0xe6,
+	0x6c, 0x68, 0x5a, 0x29, 0xf3, 0x56, 0x1b, 0x1f, 0xb8, 0x80, 0x41, 0x93, 0xec, 0x05, 0x75, 0xca,
+	0xb2, 0xed, 0xd8, 0xb0, 0x9b, 0xa4, 0xbe, 0x3e, 0xc4, 0x25, 0xec, 0x4f, 0x8a, 0xe2, 0x4f, 0x8b,
+	0xfd, 0x6e, 0xdd, 0x42, 0xb2, 0xb6, 0x7c, 0x85, 0xce, 0x1b, 0x7e, 0x04, 0xfd, 0x86, 0x67, 0xf7,
+	0xd1, 0xda, 0x53, 0x1d, 0xf1, 0x43, 0xe8, 0x4d, 0x89, 0x90, 0xba, 0xc0, 0x2d, 0x88, 0x33, 0x48,
+	0x1e, 0xad, 0xff, 0x91, 0x76, 0xc3, 0xf2, 0xe2, 0x1a, 0x0e, 0xbe, 0x95, 0x6e, 0xe8, 0x3f, 0x36,
+	0xd4, 0xfd, 0x78, 0xe6, 0x8b, 0xcf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x85, 0xb8, 0x11, 0x8a, 0xd8,
+	0x01, 0x00, 0x00,
+}
diff --git a/builtin/types/cron/cron.proto b/builtin/types/cron/cron.proto
new file mode 100644
index 00000000..63ca06ee
--- /dev/null
+++ b/builtin/types/cron/cron.proto
@@ -0,0 +1,32 @@
+syntax = "proto3";
+
+import "github.com/loomnetwork/go-loom/types/types.proto";
+
+
+message CronJob {
+    Address owner = 1;
+    string interval = 2;
+}
+
+message InitCronRequest {
+    repeated CronJob cronjob = 1;
+}
+
+message AddCronRequest {
+    CronJob cronjob = 1;
+}
+
+message AddCronResponse {
+    uint32 CronID = 1;
+    string Error = 2;
+}
+
+
+
+message ListCronRequest {
+    Address owner = 1;
+}
+
+message ListCronResponse {
+    repeated CronJob cronjob = 1;
+}