diff --git a/x/auction/abci.go b/x/auction/abci.go
index f05a518a..8ce80f90 100644
--- a/x/auction/abci.go
+++ b/x/auction/abci.go
@@ -7,8 +7,8 @@ import (
 // EndBlocker runs at the end of every block.
 func EndBlocker(ctx sdk.Context, k Keeper) {
 
-	var expiredAuctions []ID
-	k.IterateAuctionsByTime(ctx, ctx.BlockTime(), func(id ID) bool {
+	var expiredAuctions []uint64
+	k.IterateAuctionsByTime(ctx, ctx.BlockTime(), func(id uint64) bool {
 		expiredAuctions = append(expiredAuctions, id)
 		return false
 	})
diff --git a/x/auction/alias.go b/x/auction/alias.go
index acf20129..a3262826 100644
--- a/x/auction/alias.go
+++ b/x/auction/alias.go
@@ -22,7 +22,6 @@ const (
 
 var (
 	// functions aliases
-	NewIDFromString          = types.NewIDFromString
 	NewForwardAuction        = types.NewForwardAuction
 	NewReverseAuction        = types.NewReverseAuction
 	NewForwardReverseAuction = types.NewForwardReverseAuction
@@ -46,7 +45,6 @@ var (
 type (
 	Auction               = types.Auction
 	BaseAuction           = types.BaseAuction
-	ID                    = types.ID
 	ForwardAuction        = types.ForwardAuction
 	ReverseAuction        = types.ReverseAuction
 	ForwardReverseAuction = types.ForwardReverseAuction
diff --git a/x/auction/client/cli/tx.go b/x/auction/client/cli/tx.go
index c663658b..2ced6610 100644
--- a/x/auction/client/cli/tx.go
+++ b/x/auction/client/cli/tx.go
@@ -2,6 +2,7 @@ package cli
 
 import (
 	"fmt"
+	"strconv"
 
 	"github.com/kava-labs/kava/x/auction/types"
 	"github.com/spf13/cobra"
@@ -39,7 +40,7 @@ func GetCmdPlaceBid(cdc *codec.Codec) *cobra.Command {
 			cliCtx := context.NewCLIContext().WithCodec(cdc)
 			txBldr := auth.NewTxBuilderFromCLI().WithTxEncoder(utils.GetTxEncoder(cdc))
 
-			id, err := types.NewIDFromString(args[0])
+			id, err := strconv.ParseUint(args[0], 10, 64)
 			if err != nil {
 				fmt.Printf("invalid auction id - %s \n", string(args[0]))
 				return err
diff --git a/x/auction/client/rest/tx.go b/x/auction/client/rest/tx.go
index 61c9e18f..5773f24a 100644
--- a/x/auction/client/rest/tx.go
+++ b/x/auction/client/rest/tx.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"net/http"
+	"strconv"
 
 	"github.com/gorilla/mux"
 
@@ -45,7 +46,7 @@ func bidHandlerFn(cliCtx context.CLIContext) http.HandlerFunc {
 		strBid := vars[restBid]
 		strLot := vars[restLot]
 
-		auctionID, err := types.NewIDFromString(strAuctionID)
+		auctionID, err := strconv.ParseUint(strAuctionID, 10, 64)
 		if err != nil {
 			rest.WriteErrorResponse(w, http.StatusBadRequest, err.Error())
 			return
diff --git a/x/auction/keeper/auctions.go b/x/auction/keeper/auctions.go
index 0ece2e5c..51c7c804 100644
--- a/x/auction/keeper/auctions.go
+++ b/x/auction/keeper/auctions.go
@@ -10,7 +10,7 @@ import (
 )
 
 // StartForwardAuction starts a normal auction that mints the sold coins.
-func (k Keeper) StartForwardAuction(ctx sdk.Context, seller string, lot sdk.Coin, bidDenom string) (types.ID, sdk.Error) {
+func (k Keeper) StartForwardAuction(ctx sdk.Context, seller string, lot sdk.Coin, bidDenom string) (uint64, sdk.Error) {
 	// create auction
 	auction := types.NewForwardAuction(seller, lot, bidDenom, ctx.BlockTime().Add(types.DefaultMaxAuctionDuration))
 
@@ -28,7 +28,7 @@ func (k Keeper) StartForwardAuction(ctx sdk.Context, seller string, lot sdk.Coin
 }
 
 // StartReverseAuction starts an auction where sellers compete by offering decreasing prices.
-func (k Keeper) StartReverseAuction(ctx sdk.Context, buyer string, bid sdk.Coin, initialLot sdk.Coin) (types.ID, sdk.Error) {
+func (k Keeper) StartReverseAuction(ctx sdk.Context, buyer string, bid sdk.Coin, initialLot sdk.Coin) (uint64, sdk.Error) {
 	// create auction
 	auction := types.NewReverseAuction(buyer, bid, initialLot, ctx.BlockTime().Add(types.DefaultMaxAuctionDuration))
 
@@ -46,7 +46,7 @@ func (k Keeper) StartReverseAuction(ctx sdk.Context, buyer string, bid sdk.Coin,
 }
 
 // StartForwardReverseAuction starts an auction where bidders bid up to a maxBid, then switch to bidding down on price.
-func (k Keeper) StartForwardReverseAuction(ctx sdk.Context, seller string, lot sdk.Coin, maxBid sdk.Coin, lotReturnAddrs []sdk.AccAddress, lotReturnWeights []sdk.Int) (types.ID, sdk.Error) {
+func (k Keeper) StartForwardReverseAuction(ctx sdk.Context, seller string, lot sdk.Coin, maxBid sdk.Coin, lotReturnAddrs []sdk.AccAddress, lotReturnWeights []sdk.Int) (uint64, sdk.Error) {
 	// create auction
 	weightedAddresses, err := types.NewWeightedAddresses(lotReturnAddrs, lotReturnWeights)
 	if err != nil {
@@ -69,7 +69,7 @@ func (k Keeper) StartForwardReverseAuction(ctx sdk.Context, seller string, lot s
 
 // PlaceBid places a bid on any auction.
 // TODO passing bid and lot is weird when only one needed
-func (k Keeper) PlaceBid(ctx sdk.Context, auctionID types.ID, bidder sdk.AccAddress, bid sdk.Coin, lot sdk.Coin) sdk.Error {
+func (k Keeper) PlaceBid(ctx sdk.Context, auctionID uint64, bidder sdk.AccAddress, bid sdk.Coin, lot sdk.Coin) sdk.Error {
 
 	// get auction from store
 	auction, found := k.GetAuction(ctx, auctionID)
@@ -261,7 +261,7 @@ func (k Keeper) PlaceBidReverse(ctx sdk.Context, a types.ReverseAuction, bidder
 }
 
 // CloseAuction closes an auction and distributes funds to the highest bidder.
-func (k Keeper) CloseAuction(ctx sdk.Context, auctionID types.ID) sdk.Error {
+func (k Keeper) CloseAuction(ctx sdk.Context, auctionID uint64) sdk.Error {
 
 	// get the auction from the store
 	auction, found := k.GetAuction(ctx, auctionID)
diff --git a/x/auction/keeper/auctions_test.go b/x/auction/keeper/auctions_test.go
index e3ea8028..c5545476 100644
--- a/x/auction/keeper/auctions_test.go
+++ b/x/auction/keeper/auctions_test.go
@@ -220,7 +220,7 @@ func TestStartForwardAuction(t *testing.T) {
 				// check auction in store and is correct
 				require.True(t, found)
 				expectedAuction := types.Auction(types.ForwardAuction{BaseAuction: types.BaseAuction{
-					ID:         types.ID(0),
+					ID:         0,
 					Initiator:  tc.args.seller,
 					Lot:        tc.args.lot,
 					Bidder:     nil,
diff --git a/x/auction/keeper/keeper.go b/x/auction/keeper/keeper.go
index d665599b..28e41540 100644
--- a/x/auction/keeper/keeper.go
+++ b/x/auction/keeper/keeper.go
@@ -30,21 +30,21 @@ func NewKeeper(cdc *codec.Codec, storeKey sdk.StoreKey, supplyKeeper types.Suppl
 }
 
 // SetNextAuctionID stores an ID to be used for the next created auction
-func (k Keeper) SetNextAuctionID(ctx sdk.Context, id types.ID) {
+func (k Keeper) SetNextAuctionID(ctx sdk.Context, id uint64) {
 	store := ctx.KVStore(k.storeKey)
-	store.Set(types.NextAuctionIDKey, id.Bytes())
+	store.Set(types.NextAuctionIDKey, types.Uint64ToBytes(id))
 }
 
 // GetNextAuctionID reads the next available global ID from store
 // TODO might be nicer to convert not found error to a panic, it's not an error that can be recovered from
-func (k Keeper) GetNextAuctionID(ctx sdk.Context) (types.ID, sdk.Error) {
+func (k Keeper) GetNextAuctionID(ctx sdk.Context) (uint64, sdk.Error) {
 	store := ctx.KVStore(k.storeKey)
 	bz := store.Get(types.NextAuctionIDKey)
 	if bz == nil {
 		//return 0, types.ErrInvalidGenesis(k.codespace, "initial auction ID hasn't been set") // TODO create error
 		return 0, sdk.ErrInternal("initial auction ID hasn't been set")
 	}
-	return types.NewIDFromBytes(bz), nil
+	return types.Uint64FromBytes(bz), nil
 }
 
 // incrementNextAuctionID increments the global ID in the store by 1
@@ -58,7 +58,7 @@ func (k Keeper) IncrementNextAuctionID(ctx sdk.Context) sdk.Error {
 }
 
 // StoreNewAuction stores an auction, adding a new ID
-func (k Keeper) StoreNewAuction(ctx sdk.Context, auction types.Auction) (types.ID, sdk.Error) {
+func (k Keeper) StoreNewAuction(ctx sdk.Context, auction types.Auction) (uint64, sdk.Error) {
 	newAuctionID, err := k.GetNextAuctionID(ctx)
 	if err != nil {
 		return 0, err
@@ -93,7 +93,7 @@ func (k Keeper) SetAuction(ctx sdk.Context, auction types.Auction) {
 }
 
 // getAuction gets an auction from the store by auctionID
-func (k Keeper) GetAuction(ctx sdk.Context, auctionID types.ID) (types.Auction, bool) {
+func (k Keeper) GetAuction(ctx sdk.Context, auctionID uint64) (types.Auction, bool) {
 	var auction types.Auction
 
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionKeyPrefix)
@@ -107,7 +107,7 @@ func (k Keeper) GetAuction(ctx sdk.Context, auctionID types.ID) (types.Auction,
 }
 
 // DeleteAuction removes an auction from the store without any validation
-func (k Keeper) DeleteAuction(ctx sdk.Context, auctionID types.ID) {
+func (k Keeper) DeleteAuction(ctx sdk.Context, auctionID uint64) {
 	// remove from index
 	auction, found := k.GetAuction(ctx, auctionID)
 	if found {
@@ -120,13 +120,13 @@ func (k Keeper) DeleteAuction(ctx sdk.Context, auctionID types.ID) {
 }
 
 // InsertIntoIndex adds an auction ID and end time into the byTime index
-func (k Keeper) InsertIntoIndex(ctx sdk.Context, endTime time.Time, auctionID types.ID) {
+func (k Keeper) InsertIntoIndex(ctx sdk.Context, endTime time.Time, auctionID uint64) {
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionByTimeKeyPrefix)
-	store.Set(types.GetAuctionByTimeKey(endTime, auctionID), auctionID.Bytes())
+	store.Set(types.GetAuctionByTimeKey(endTime, auctionID), types.Uint64ToBytes(auctionID)) // TODO
 }
 
 // RemoveFromIndex removes an auction ID and end time from the byTime index
-func (k Keeper) RemoveFromIndex(ctx sdk.Context, endTime time.Time, auctionID types.ID) {
+func (k Keeper) RemoveFromIndex(ctx sdk.Context, endTime time.Time, auctionID uint64) {
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionByTimeKeyPrefix)
 	store.Delete(types.GetAuctionByTimeKey(endTime, auctionID))
 }
@@ -134,7 +134,7 @@ func (k Keeper) RemoveFromIndex(ctx sdk.Context, endTime time.Time, auctionID ty
 // IterateAuctionByTime provides an iterator over auctions ordered by auction.EndTime.
 // For each auction cb will be callled. If cb returns true the iterator will close and stop.
 // TODO can the cutoff time be removed in favour of caller specifying cutoffs in the callback?
-func (k Keeper) IterateAuctionsByTime(ctx sdk.Context, inclusiveCutoffTime time.Time, cb func(auctionID types.ID) (stop bool)) {
+func (k Keeper) IterateAuctionsByTime(ctx sdk.Context, inclusiveCutoffTime time.Time, cb func(auctionID uint64) (stop bool)) {
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionByTimeKeyPrefix)
 	iterator := store.Iterator(
 		nil, // start at the very start of the prefix store
@@ -144,7 +144,7 @@ func (k Keeper) IterateAuctionsByTime(ctx sdk.Context, inclusiveCutoffTime time.
 	defer iterator.Close()
 	for ; iterator.Valid(); iterator.Next() {
 		// TODO get the auction ID - either read from store, or extract from key
-		auctionID := types.NewIDFromBytes(iterator.Value())
+		auctionID := types.Uint64FromBytes(iterator.Value())
 
 		if cb(auctionID) {
 			break
diff --git a/x/auction/keeper/keeper_test.go b/x/auction/keeper/keeper_test.go
index 3667aeb8..cc6fbce1 100644
--- a/x/auction/keeper/keeper_test.go
+++ b/x/auction/keeper/keeper_test.go
@@ -17,7 +17,7 @@ func SetGetDeleteAuction(t *testing.T) {
 	keeper := tApp.GetAuctionKeeper()
 	ctx := tApp.NewContext(true, abci.Header{})
 	someTime := time.Date(43, time.January, 1, 0, 0, 0, 0, time.UTC) // need to specify UTC as tz info is lost on unmarshal
-	id := types.ID(5)
+	var id uint64 = 5
 	auction := types.NewForwardAuction("some_module", c("usdx", 100), "kava", someTime).WithID(id)
 
 	// write and read from store
@@ -28,7 +28,7 @@ func SetGetDeleteAuction(t *testing.T) {
 	require.True(t, found)
 	require.Equal(t, auction, readAuction)
 	// check auction is in the index
-	keeper.IterateAuctionsByTime(ctx, auction.GetEndTime(), func(readID types.ID) bool {
+	keeper.IterateAuctionsByTime(ctx, auction.GetEndTime(), func(readID uint64) bool {
 		require.Equal(t, auction.GetID(), readID)
 		return false
 	})
@@ -40,7 +40,7 @@ func SetGetDeleteAuction(t *testing.T) {
 	_, found = keeper.GetAuction(ctx, id)
 	require.False(t, found)
 	// check auction not in index
-	keeper.IterateAuctionsByTime(ctx, time.Unix(999999999, 0), func(readID types.ID) bool {
+	keeper.IterateAuctionsByTime(ctx, time.Unix(999999999, 0), func(readID uint64) bool {
 		require.Fail(t, "index should be empty", " found auction ID '%s", readID)
 		return false
 	})
@@ -53,7 +53,7 @@ func TestIncrementNextAuctionID(t *testing.T) {
 	ctx := tApp.NewContext(true, abci.Header{})
 
 	// store id
-	id := types.ID(123456)
+	var id uint64 = 123456
 	keeper.SetNextAuctionID(ctx, id)
 
 	require.NoError(t, keeper.IncrementNextAuctionID(ctx))
@@ -101,7 +101,7 @@ func TestIterateAuctionsByTime(t *testing.T) {
 	// setup byTime index
 	byTimeIndex := []struct {
 		endTime   time.Time
-		auctionID types.ID
+		auctionID uint64
 	}{
 		{time.Date(0, time.January, 1, 0, 0, 0, 0, time.UTC), 9999},            // distant past
 		{time.Date(1998, time.January, 1, 11, 59, 59, 999999999, time.UTC), 1}, // just before cutoff
@@ -118,15 +118,15 @@ func TestIterateAuctionsByTime(t *testing.T) {
 
 	// read out values from index up to a cutoff time and check they are as expected
 	cutoffTime := time.Date(1998, time.January, 1, 12, 0, 0, 0, time.UTC)
-	var expectedIndex []types.ID
+	var expectedIndex []uint64
 	for _, v := range byTimeIndex {
 		if v.endTime.Before(cutoffTime) || v.endTime.Equal(cutoffTime) { // endTime ≤ cutoffTime
 			expectedIndex = append(expectedIndex, v.auctionID)
 		}
 
 	}
-	var readIndex []types.ID
-	keeper.IterateAuctionsByTime(ctx, cutoffTime, func(id types.ID) bool {
+	var readIndex []uint64
+	keeper.IterateAuctionsByTime(ctx, cutoffTime, func(id uint64) bool {
 		readIndex = append(readIndex, id)
 		return false
 	})
diff --git a/x/auction/types/auctions.go b/x/auction/types/auctions.go
index b293c5ee..5b9b079f 100644
--- a/x/auction/types/auctions.go
+++ b/x/auction/types/auctions.go
@@ -1,41 +1,17 @@
 package types
 
 import (
-	"encoding/binary"
 	"fmt"
-	"strconv"
 	"time"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/supply"
 )
 
-// ID type for auction IDs
-type ID uint64
-
-// TODO can this be removed?
-// NewIDFromString generate new auction ID from a string
-func NewIDFromString(s string) (ID, error) {
-	n, err := strconv.ParseUint(s, 10, 64) // copied from how the gov module rest handler's parse proposal IDs
-	if err != nil {
-		return 0, err
-	}
-	return ID(n), nil
-}
-func NewIDFromBytes(bz []byte) ID {
-	return ID(binary.BigEndian.Uint64(bz))
-
-}
-func (id ID) Bytes() []byte {
-	bz := make([]byte, 8)
-	binary.BigEndian.PutUint64(bz, uint64(id))
-	return bz
-}
-
 // Auction is an interface to several types of auction.
 type Auction interface {
-	GetID() ID
-	WithID(ID) Auction
+	GetID() uint64
+	WithID(uint64) Auction
 	GetBidder() sdk.AccAddress
 	GetBid() sdk.Coin
 	GetLot() sdk.Coin
@@ -44,7 +20,7 @@ type Auction interface {
 
 // BaseAuction type shared by all Auctions
 type BaseAuction struct {
-	ID         ID
+	ID         uint64
 	Initiator  string         // Module that starts the auction. Giving away Lot (aka seller in a forward auction). Restricted to being a module account name rather than any account.
 	Lot        sdk.Coin       // Amount of coins up being given by initiator (FA - amount for sale by seller, RA - cost of good by buyer (bid))
 	Bidder     sdk.AccAddress // Person who bids in the auction. Receiver of Lot. (aka buyer in forward auction, seller in RA)
@@ -54,7 +30,7 @@ type BaseAuction struct {
 }
 
 // GetID getter for auction ID
-func (a BaseAuction) GetID() ID { return a.ID }
+func (a BaseAuction) GetID() uint64 { return a.ID }
 
 // GetBid getter for auction bid
 func (a BaseAuction) GetBidder() sdk.AccAddress { return a.Bidder }
@@ -88,7 +64,7 @@ type ForwardAuction struct {
 }
 
 // WithID returns an auction with the ID set
-func (a ForwardAuction) WithID(id ID) Auction { a.ID = id; return a }
+func (a ForwardAuction) WithID(id uint64) Auction { a.ID = id; return a }
 
 // NewForwardAuction creates a new forward auction
 func NewForwardAuction(seller string, lot sdk.Coin, bidDenom string, endTime time.Time) ForwardAuction {
@@ -110,7 +86,7 @@ type ReverseAuction struct {
 }
 
 // WithID returns an auction with the ID set
-func (a ReverseAuction) WithID(id ID) Auction { a.ID = id; return a }
+func (a ReverseAuction) WithID(id uint64) Auction { a.ID = id; return a }
 
 // NewReverseAuction creates a new reverse auction
 func NewReverseAuction(buyerModAccName string, bid sdk.Coin, initialLot sdk.Coin, EndTime time.Time) ReverseAuction {
@@ -138,7 +114,7 @@ type ForwardReverseAuction struct {
 }
 
 // WithID returns an auction with the ID set
-func (a ForwardReverseAuction) WithID(id ID) Auction { a.ID = id; return a }
+func (a ForwardReverseAuction) WithID(id uint64) Auction { a.ID = id; return a }
 
 func (a ForwardReverseAuction) String() string {
 	return fmt.Sprintf(`Auction %d:
diff --git a/x/auction/types/genesis.go b/x/auction/types/genesis.go
index 15530961..27f9eb52 100644
--- a/x/auction/types/genesis.go
+++ b/x/auction/types/genesis.go
@@ -9,13 +9,13 @@ type GenesisAuctions []Auction
 
 // GenesisState - auction state that must be provided at genesis
 type GenesisState struct {
-	NextAuctionID ID
+	NextAuctionID uint64 `json:"next_auction_id" yaml:"next_auction_id"`
 	AuctionParams AuctionParams   `json:"auction_params" yaml:"auction_params"`
 	Auctions      GenesisAuctions `json:"genesis_auctions" yaml:"genesis_auctions"`
 }
 
 // NewGenesisState returns a new genesis state object for auctions module
-func NewGenesisState(nextID ID, ap AuctionParams, ga GenesisAuctions) GenesisState {
+func NewGenesisState(nextID uint64, ap AuctionParams, ga GenesisAuctions) GenesisState {
 	return GenesisState{
 		NextAuctionID: nextID,
 		AuctionParams: ap,
@@ -25,7 +25,7 @@ func NewGenesisState(nextID ID, ap AuctionParams, ga GenesisAuctions) GenesisSta
 
 // DefaultGenesisState defines default genesis state for auction module
 func DefaultGenesisState() GenesisState {
-	return NewGenesisState(ID(0), DefaultAuctionParams(), GenesisAuctions{})
+	return NewGenesisState(0, DefaultAuctionParams(), GenesisAuctions{})
 }
 
 // Equal checks whether two GenesisState structs are equivalent
diff --git a/x/auction/types/keys.go b/x/auction/types/keys.go
index fc20ef14..e63bdf54 100644
--- a/x/auction/types/keys.go
+++ b/x/auction/types/keys.go
@@ -1,6 +1,7 @@
 package types
 
 import (
+	"encoding/binary"
 	"time"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -28,10 +29,20 @@ var (
 	NextAuctionIDKey = []byte{0x02}
 )
 
-func GetAuctionKey(auctionID ID) []byte {
-	return auctionID.Bytes()
+func GetAuctionKey(auctionID uint64) []byte {
+	return Uint64ToBytes(auctionID)
 }
 
-func GetAuctionByTimeKey(endTime time.Time, auctionID ID) []byte {
-	return append(sdk.FormatTimeBytes(endTime), auctionID.Bytes()...)
+func GetAuctionByTimeKey(endTime time.Time, auctionID uint64) []byte {
+	return append(sdk.FormatTimeBytes(endTime), Uint64ToBytes(auctionID)...)
 }
+
+func Uint64FromBytes(bz []byte) uint64 {
+	return binary.BigEndian.Uint64(bz)
+}
+
+func Uint64ToBytes(id uint64) []byte {
+	bz := make([]byte, 8)
+	binary.BigEndian.PutUint64(bz, uint64(id))
+	return bz
+}
\ No newline at end of file
diff --git a/x/auction/types/msg.go b/x/auction/types/msg.go
index 5cdc60e3..0014d01e 100644
--- a/x/auction/types/msg.go
+++ b/x/auction/types/msg.go
@@ -4,14 +4,14 @@ import sdk "github.com/cosmos/cosmos-sdk/types"
 
 // MsgPlaceBid is the message type used to place a bid on any type of auction.
 type MsgPlaceBid struct {
-	AuctionID ID
+	AuctionID uint64
 	Bidder    sdk.AccAddress // This can be a buyer (who increments bid), or a seller (who decrements lot) TODO rename to be clearer?
 	Bid       sdk.Coin
 	Lot       sdk.Coin
 }
 
 // NewMsgPlaceBid returns a new MsgPlaceBid.
-func NewMsgPlaceBid(auctionID ID, bidder sdk.AccAddress, bid sdk.Coin, lot sdk.Coin) MsgPlaceBid {
+func NewMsgPlaceBid(auctionID uint64, bidder sdk.AccAddress, bid sdk.Coin, lot sdk.Coin) MsgPlaceBid {
 	return MsgPlaceBid{
 		AuctionID: auctionID,
 		Bidder:    bidder,
diff --git a/x/liquidator/keeper/keeper.go b/x/liquidator/keeper/keeper.go
index 59354270..5134d47e 100644
--- a/x/liquidator/keeper/keeper.go
+++ b/x/liquidator/keeper/keeper.go
@@ -5,7 +5,6 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/params/subspace"
 
-	"github.com/kava-labs/kava/x/auction"
 	"github.com/kava-labs/kava/x/liquidator/types"
 )
 
@@ -33,7 +32,7 @@ func NewKeeper(cdc *codec.Codec, storeKey sdk.StoreKey, paramstore subspace.Subs
 // SeizeAndStartCollateralAuction pulls collateral out of a CDP and sells it in an auction for stable coin. Excess collateral goes to the original CDP owner.
 // Known as Cat.bite in maker
 // result: stable coin is transferred to module account, collateral is transferred from module account to buyer, (and any excess collateral is transferred to original CDP owner)
-func (k Keeper) SeizeAndStartCollateralAuction(ctx sdk.Context, owner sdk.AccAddress, collateralDenom string) (auction.ID, sdk.Error) {
+func (k Keeper) SeizeAndStartCollateralAuction(ctx sdk.Context, owner sdk.AccAddress, collateralDenom string) (uint64, sdk.Error) {
 	// Get CDP
 	cdp, found := k.cdpKeeper.GetCDP(ctx, owner, collateralDenom)
 	if !found {
@@ -73,7 +72,7 @@ func (k Keeper) SeizeAndStartCollateralAuction(ctx sdk.Context, owner sdk.AccAdd
 // StartDebtAuction sells off minted gov coin to raise set amounts of stable coin.
 // Known as Vow.flop in maker
 // result: minted gov coin moved to highest bidder, stable coin moved to moduleAccount
-func (k Keeper) StartDebtAuction(ctx sdk.Context) (auction.ID, sdk.Error) {
+func (k Keeper) StartDebtAuction(ctx sdk.Context) (uint64, sdk.Error) {
 
 	// Ensure amount of seized stable coin is 0 (ie Joy = 0)
 	stableCoins := k.bankKeeper.GetCoins(ctx, k.cdpKeeper.GetLiquidatorAccountAddress()).AmountOf(k.cdpKeeper.GetStableDenom())
@@ -107,7 +106,7 @@ func (k Keeper) StartDebtAuction(ctx sdk.Context) (auction.ID, sdk.Error) {
 // StartSurplusAuction sells off excess stable coin in exchange for gov coin, which is burned
 // Known as Vow.flap in maker
 // result: stable coin removed from module account (eventually to buyer), gov coin transferred to module account
-// func (k Keeper) StartSurplusAuction(ctx sdk.Context) (auction.ID, sdk.Error) {
+// func (k Keeper) StartSurplusAuction(ctx sdk.Context) (uint64, sdk.Error) {
 
 // 	// TODO ensure seized debt is 0
 
diff --git a/x/liquidator/types/expected_keepers.go b/x/liquidator/types/expected_keepers.go
index deea2bd4..39bede95 100644
--- a/x/liquidator/types/expected_keepers.go
+++ b/x/liquidator/types/expected_keepers.go
@@ -3,7 +3,6 @@ package types
 import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
-	"github.com/kava-labs/kava/x/auction"
 	"github.com/kava-labs/kava/x/cdp"
 )
 
@@ -26,7 +25,7 @@ type BankKeeper interface {
 
 // AuctionKeeper expected interface for the auction keeper
 type AuctionKeeper interface {
-	StartForwardAuction(sdk.Context, sdk.AccAddress, sdk.Coin, sdk.Coin) (auction.ID, sdk.Error)
-	StartReverseAuction(sdk.Context, sdk.AccAddress, sdk.Coin, sdk.Coin) (auction.ID, sdk.Error)
-	StartForwardReverseAuction(sdk.Context, sdk.AccAddress, sdk.Coin, sdk.Coin, sdk.AccAddress) (auction.ID, sdk.Error)
+	StartForwardAuction(sdk.Context, sdk.AccAddress, sdk.Coin, sdk.Coin) (uint64, sdk.Error)
+	StartReverseAuction(sdk.Context, sdk.AccAddress, sdk.Coin, sdk.Coin) (uint64, sdk.Error)
+	StartForwardReverseAuction(sdk.Context, sdk.AccAddress, sdk.Coin, sdk.Coin, sdk.AccAddress) (uint64, sdk.Error)
 }