diff --git a/go.mod b/go.mod
index 95dbda5..716b5ec 100644
--- a/go.mod
+++ b/go.mod
@@ -86,6 +86,7 @@ require (
 	github.com/gorilla/handlers v1.5.1 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.11.3 // indirect
 	github.com/gsterjov/go-libsecret v0.0.0-20161001094733-a6f4afe4910c // indirect
 	github.com/gtank/merlin v0.1.1 // indirect
 	github.com/gtank/ristretto255 v0.1.2 // indirect
diff --git a/go.sum b/go.sum
index 07b1083..ad897ba 100644
--- a/go.sum
+++ b/go.sum
@@ -734,6 +734,8 @@ github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t
 github.com/grpc-ecosystem/grpc-gateway v1.9.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0 h1:gmcG1KaJ57LophUzW0Hy8NmPhnMZb4M0+kPpLofRdBo=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.11.3 h1:lLT7ZLSzGLI08vc9cpd+tYmNWjdKDqyr/2L+f6U12Fk=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.11.3/go.mod h1:o//XUCC/F+yRGJoPO/VU0GSB0f8Nhgmxx0VIRUvaC0w=
 github.com/gsterjov/go-libsecret v0.0.0-20161001094733-a6f4afe4910c h1:6rhixN/i8ZofjG1Y75iExal34USq5p+wiN1tpie8IrU=
 github.com/gsterjov/go-libsecret v0.0.0-20161001094733-a6f4afe4910c/go.mod h1:NMPJylDgVpX0MLRlPy15sqSwOFv/U1GZ2m21JhFfek0=
 github.com/gtank/merlin v0.1.1-0.20191105220539-8318aed1a79f/go.mod h1:T86dnYJhcGOh5BjZFCJWTDeTK7XW8uE+E21Cy/bIQ+s=
diff --git a/proto/cosmostest/auction.proto b/proto/cosmostest/auction.proto
index 6788f5c..2f0874c 100644
--- a/proto/cosmostest/auction.proto
+++ b/proto/cosmostest/auction.proto
@@ -9,6 +9,6 @@ message Auction {
   string index = 1; 
   string name = 2; 
   string description = 3; 
-  repeated Bid bids = 4; 
+  Bid topBid = 4;
 }
 
diff --git a/x/cosmostest/keeper/msg_server_new_auction.go b/x/cosmostest/keeper/msg_server_new_auction.go
index eaaf170..11c8387 100644
--- a/x/cosmostest/keeper/msg_server_new_auction.go
+++ b/x/cosmostest/keeper/msg_server_new_auction.go
@@ -23,13 +23,13 @@ func (k msgServer) NewAuction(goCtx context.Context, msg *types.MsgNewAuction) (
 		Index:       index,
 		Name:        msg.Name,
 		Description: msg.Description,
-		Bids:        []*types.Bid{},
+		TopBid:      new(types.Bid),
 	}
 
 	k.Keeper.SetAuction(ctx, auction)
 	next.AuctionId++
 
-	k.Keeper.SetNextAuction(ctx, types.NextAuction{next.AuctionId})
+	k.Keeper.SetNextAuction(ctx, types.NextAuction{AuctionId: next.AuctionId})
 
 	return &types.MsgNewAuctionResponse{
 		AuctionId: strconv.FormatUint(next.AuctionId, 10),
diff --git a/x/cosmostest/types/auction.pb.go b/x/cosmostest/types/auction.pb.go
index 2deb7fa..0f9ad66 100644
--- a/x/cosmostest/types/auction.pb.go
+++ b/x/cosmostest/types/auction.pb.go
@@ -26,7 +26,7 @@ type Auction struct {
 	Index       string `protobuf:"bytes,1,opt,name=index,proto3" json:"index,omitempty"`
 	Name        string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
 	Description string `protobuf:"bytes,3,opt,name=description,proto3" json:"description,omitempty"`
-	Bids        []*Bid `protobuf:"bytes,4,rep,name=bids,proto3" json:"bids,omitempty"`
+	TopBid      *Bid   `protobuf:"bytes,4,opt,name=topBid,proto3" json:"topBid,omitempty"`
 }
 
 func (m *Auction) Reset()         { *m = Auction{} }
@@ -83,9 +83,9 @@ func (m *Auction) GetDescription() string {
 	return ""
 }
 
-func (m *Auction) GetBids() []*Bid {
+func (m *Auction) GetTopBid() *Bid {
 	if m != nil {
-		return m.Bids
+		return m.TopBid
 	}
 	return nil
 }
@@ -97,20 +97,20 @@ func init() {
 func init() { proto.RegisterFile("cosmostest/auction.proto", fileDescriptor_631f6f59914101d9) }
 
 var fileDescriptor_631f6f59914101d9 = []byte{
-	// 200 bytes of a gzipped FileDescriptorProto
+	// 202 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x92, 0x48, 0xce, 0x2f, 0xce,
 	0xcd, 0x2f, 0x2e, 0x49, 0x2d, 0x2e, 0xd1, 0x4f, 0x2c, 0x4d, 0x2e, 0xc9, 0xcc, 0xcf, 0xd3, 0x2b,
 	0x28, 0xca, 0x2f, 0xc9, 0x17, 0x12, 0x45, 0xc8, 0xe8, 0x21, 0x98, 0x52, 0x22, 0x48, 0x1a, 0x92,
-	0x32, 0x53, 0x20, 0x8a, 0x95, 0x5a, 0x19, 0xb9, 0xd8, 0x1d, 0x21, 0xda, 0x85, 0x44, 0xb8, 0x58,
+	0x32, 0x53, 0x20, 0x8a, 0x95, 0x3a, 0x19, 0xb9, 0xd8, 0x1d, 0x21, 0xda, 0x85, 0x44, 0xb8, 0x58,
 	0x33, 0xf3, 0x52, 0x52, 0x2b, 0x24, 0x18, 0x15, 0x18, 0x35, 0x38, 0x83, 0x20, 0x1c, 0x21, 0x21,
 	0x2e, 0x96, 0xbc, 0xc4, 0xdc, 0x54, 0x09, 0x26, 0xb0, 0x20, 0x98, 0x2d, 0xa4, 0xc0, 0xc5, 0x9d,
-	0x92, 0x5a, 0x9c, 0x5c, 0x94, 0x59, 0x00, 0xd2, 0x28, 0xc1, 0x0c, 0x96, 0x42, 0x16, 0x12, 0xd2,
-	0xe3, 0x62, 0x49, 0xca, 0x4c, 0x29, 0x96, 0x60, 0x51, 0x60, 0xd6, 0xe0, 0x36, 0x92, 0xd2, 0xc3,
-	0xea, 0x26, 0x3d, 0xa7, 0xcc, 0x94, 0x20, 0xb0, 0x3a, 0x27, 0x8b, 0x13, 0x8f, 0xe4, 0x18, 0x2f,
-	0x3c, 0x92, 0x63, 0x7c, 0xf0, 0x48, 0x8e, 0x71, 0xc2, 0x63, 0x39, 0x86, 0x0b, 0x8f, 0xe5, 0x18,
-	0x6e, 0x3c, 0x96, 0x63, 0x88, 0x92, 0x83, 0xa8, 0xd7, 0x05, 0x3b, 0xbc, 0x42, 0x1f, 0xc9, 0x17,
-	0x25, 0x95, 0x05, 0xa9, 0xc5, 0x49, 0x6c, 0x60, 0x8f, 0x18, 0x03, 0x02, 0x00, 0x00, 0xff, 0xff,
-	0x94, 0x35, 0x9e, 0x85, 0x11, 0x01, 0x00, 0x00,
+	0x92, 0x5a, 0x9c, 0x5c, 0x94, 0x59, 0x00, 0xd2, 0x28, 0xc1, 0x0c, 0x96, 0x42, 0x16, 0x12, 0x32,
+	0xe2, 0x62, 0x2b, 0xc9, 0x2f, 0x70, 0xca, 0x4c, 0x91, 0x60, 0x51, 0x60, 0xd4, 0xe0, 0x36, 0x92,
+	0xd2, 0xc3, 0xea, 0x2a, 0x3d, 0xa7, 0xcc, 0x94, 0x20, 0xa8, 0x4a, 0x27, 0x8b, 0x13, 0x8f, 0xe4,
+	0x18, 0x2f, 0x3c, 0x92, 0x63, 0x7c, 0xf0, 0x48, 0x8e, 0x71, 0xc2, 0x63, 0x39, 0x86, 0x0b, 0x8f,
+	0xe5, 0x18, 0x6e, 0x3c, 0x96, 0x63, 0x88, 0x92, 0x83, 0xe8, 0xd0, 0x05, 0x3b, 0xbe, 0x42, 0x1f,
+	0xc9, 0x27, 0x25, 0x95, 0x05, 0xa9, 0xc5, 0x49, 0x6c, 0x60, 0xcf, 0x18, 0x03, 0x02, 0x00, 0x00,
+	0xff, 0xff, 0xe9, 0x88, 0x26, 0x2e, 0x15, 0x01, 0x00, 0x00,
 }
 
 func (m *Auction) Marshal() (dAtA []byte, err error) {
@@ -133,19 +133,17 @@ func (m *Auction) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
-	if len(m.Bids) > 0 {
-		for iNdEx := len(m.Bids) - 1; iNdEx >= 0; iNdEx-- {
-			{
-				size, err := m.Bids[iNdEx].MarshalToSizedBuffer(dAtA[:i])
-				if err != nil {
-					return 0, err
-				}
-				i -= size
-				i = encodeVarintAuction(dAtA, i, uint64(size))
+	if m.TopBid != nil {
+		{
+			size, err := m.TopBid.MarshalToSizedBuffer(dAtA[:i])
+			if err != nil {
+				return 0, err
 			}
-			i--
-			dAtA[i] = 0x22
+			i -= size
+			i = encodeVarintAuction(dAtA, i, uint64(size))
 		}
+		i--
+		dAtA[i] = 0x22
 	}
 	if len(m.Description) > 0 {
 		i -= len(m.Description)
@@ -200,11 +198,9 @@ func (m *Auction) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovAuction(uint64(l))
 	}
-	if len(m.Bids) > 0 {
-		for _, e := range m.Bids {
-			l = e.Size()
-			n += 1 + l + sovAuction(uint64(l))
-		}
+	if m.TopBid != nil {
+		l = m.TopBid.Size()
+		n += 1 + l + sovAuction(uint64(l))
 	}
 	return n
 }
@@ -342,7 +338,7 @@ func (m *Auction) Unmarshal(dAtA []byte) error {
 			iNdEx = postIndex
 		case 4:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Bids", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field TopBid", wireType)
 			}
 			var msglen int
 			for shift := uint(0); ; shift += 7 {
@@ -369,8 +365,10 @@ func (m *Auction) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Bids = append(m.Bids, &Bid{})
-			if err := m.Bids[len(m.Bids)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+			if m.TopBid == nil {
+				m.TopBid = &Bid{}
+			}
+			if err := m.TopBid.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
 				return err
 			}
 			iNdEx = postIndex