diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ece47f3b9..1e429a1c8e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 ## 0.18.1
 
+BREAKING CHANGES
+
+* [x/auth] move stuff specific to auth anteHandler to the auth module rather than the types folder. This includes:
+  * StdTx (and its related stuff i.e. StdSignDoc, etc)
+  * StdFee
+  * StdSignature
+  * Account interface
+  * Related to this organization, I also:
+* [x/auth] got rid of AccountMapper interface (in favor of the struct already in auth module)
+* [x/auth] removed the FeeHandler function from the AnteHandler, Replaced with FeeKeeper
+* [x/auth] Removed GetSignatures() from Tx interface (as different Tx styles might use something different than StdSignature)
+
 BUG FIXES
 
 * auto-sequencing transactions correctly
diff --git a/Gopkg.lock b/Gopkg.lock
index dcc57cab33..37a32820c2 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -13,51 +13,6 @@
   packages = ["btcec"]
   revision = "1432d294a5b055c297457c25434efbf13384cc46"
 
-[[projects]]
-  name = "github.com/cosmos/cosmos-sdk"
-  packages = [
-    "baseapp",
-    "client",
-    "client/context",
-    "client/keys",
-    "client/lcd",
-    "client/rpc",
-    "client/tx",
-    "cmd/gaia/app",
-    "examples/basecoin/app",
-    "examples/basecoin/types",
-    "examples/democoin/app",
-    "examples/democoin/types",
-    "examples/democoin/x/cool",
-    "examples/democoin/x/cool/client/cli",
-    "examples/democoin/x/pow",
-    "examples/democoin/x/pow/client/cli",
-    "examples/democoin/x/simplestake",
-    "examples/democoin/x/simplestake/client/cli",
-    "examples/democoin/x/sketchy",
-    "mock",
-    "server",
-    "store",
-    "tests",
-    "types",
-    "version",
-    "wire",
-    "x/auth",
-    "x/auth/client/cli",
-    "x/auth/client/rest",
-    "x/bank",
-    "x/bank/client",
-    "x/bank/client/cli",
-    "x/bank/client/rest",
-    "x/ibc",
-    "x/ibc/client/cli",
-    "x/ibc/client/rest",
-    "x/stake",
-    "x/stake/client/cli"
-  ]
-  revision = "187be1a5df81de1fd71da9053102d3a4868ec979"
-  version = "v0.17.2"
-
 [[projects]]
   name = "github.com/davecgh/go-spew"
   packages = ["spew"]
@@ -502,6 +457,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "9b6ee069da61cf1815c332c5624e8af99b51ea72e2e9b91d780db92299598dcc"
+  inputs-digest = "7540d2ecdb5d7d5084ab4e6132e929bbd501bd6add3006d8f08a6b2c127e0c7d"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/baseapp/baseapp.go b/baseapp/baseapp.go
index ef3bbc3c79..4ce8a05d9b 100644
--- a/baseapp/baseapp.go
+++ b/baseapp/baseapp.go
@@ -15,6 +15,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/store"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/wire"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 // Key to store the header in the DB itself.
@@ -125,7 +126,7 @@ func (app *BaseApp) SetTxDecoder(txDecoder sdk.TxDecoder) {
 // default custom logic for transaction decoding
 func defaultTxDecoder(cdc *wire.Codec) sdk.TxDecoder {
 	return func(txBytes []byte) (sdk.Tx, sdk.Error) {
-		var tx = sdk.StdTx{}
+		var tx = auth.StdTx{}
 
 		if len(txBytes) == 0 {
 			return nil, sdk.ErrTxDecode("txBytes are empty")
diff --git a/baseapp/baseapp_test.go b/baseapp/baseapp_test.go
index 969a9f9add..61498b1b19 100644
--- a/baseapp/baseapp_test.go
+++ b/baseapp/baseapp_test.go
@@ -11,13 +11,14 @@ import (
 	"github.com/stretchr/testify/require"
 
 	abci "github.com/tendermint/abci/types"
-	"github.com/tendermint/go-crypto"
+	crypto "github.com/tendermint/go-crypto"
 	cmn "github.com/tendermint/tmlibs/common"
 	dbm "github.com/tendermint/tmlibs/db"
 	"github.com/tendermint/tmlibs/log"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/wire"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 func defaultLogger() log.Logger {
@@ -446,12 +447,12 @@ type testUpdatePowerTx struct {
 
 const msgType = "testUpdatePowerTx"
 
-func (tx testUpdatePowerTx) Type() string                      { return msgType }
-func (tx testUpdatePowerTx) GetMsg() sdk.Msg                   { return tx }
-func (tx testUpdatePowerTx) GetSignBytes() []byte              { return nil }
-func (tx testUpdatePowerTx) ValidateBasic() sdk.Error          { return nil }
-func (tx testUpdatePowerTx) GetSigners() []sdk.Address         { return nil }
-func (tx testUpdatePowerTx) GetSignatures() []sdk.StdSignature { return nil }
+func (tx testUpdatePowerTx) Type() string                       { return msgType }
+func (tx testUpdatePowerTx) GetMsg() sdk.Msg                    { return tx }
+func (tx testUpdatePowerTx) GetSignBytes() []byte               { return nil }
+func (tx testUpdatePowerTx) ValidateBasic() sdk.Error           { return nil }
+func (tx testUpdatePowerTx) GetSigners() []sdk.Address          { return nil }
+func (tx testUpdatePowerTx) GetSignatures() []auth.StdSignature { return nil }
 
 func TestValidatorChange(t *testing.T) {
 
diff --git a/client/context/helpers.go b/client/context/helpers.go
index 562bde9b4c..f4686befde 100644
--- a/client/context/helpers.go
+++ b/client/context/helpers.go
@@ -6,6 +6,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/cosmos/cosmos-sdk/wire"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 	rpcclient "github.com/tendermint/tendermint/rpc/client"
 	ctypes "github.com/tendermint/tendermint/rpc/core/types"
 	cmn "github.com/tendermint/tmlibs/common"
@@ -109,11 +110,11 @@ func (ctx CoreContext) SignAndBuild(name, passphrase string, msg sdk.Msg, cdc *w
 		return nil, errors.Errorf("Chain ID required but not specified")
 	}
 	sequence := ctx.Sequence
-	signMsg := sdk.StdSignMsg{
+	signMsg := auth.StdSignMsg{
 		ChainID:   chainID,
 		Sequences: []int64{sequence},
 		Msg:       msg,
-		Fee:       sdk.NewStdFee(10000, sdk.Coin{}), // TODO run simulate to estimate gas?
+		Fee:       auth.NewStdFee(10000, sdk.Coin{}), // TODO run simulate to estimate gas?
 	}
 
 	keybase, err := keys.GetKeyBase()
@@ -128,14 +129,14 @@ func (ctx CoreContext) SignAndBuild(name, passphrase string, msg sdk.Msg, cdc *w
 	if err != nil {
 		return nil, err
 	}
-	sigs := []sdk.StdSignature{{
+	sigs := []auth.StdSignature{{
 		PubKey:    pubkey,
 		Signature: sig,
 		Sequence:  sequence,
 	}}
 
 	// marshal bytes
-	tx := sdk.NewStdTx(signMsg.Msg, signMsg.Fee, sigs)
+	tx := auth.NewStdTx(signMsg.Msg, signMsg.Fee, sigs)
 
 	return cdc.MarshalBinary(tx)
 }
diff --git a/client/context/types.go b/client/context/types.go
index e580027d67..da15b32936 100644
--- a/client/context/types.go
+++ b/client/context/types.go
@@ -3,7 +3,7 @@ package context
 import (
 	rpcclient "github.com/tendermint/tendermint/rpc/client"
 
-	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 // typical context created in sdk modules for transactions/queries
@@ -15,7 +15,7 @@ type CoreContext struct {
 	FromAddressName string
 	Sequence        int64
 	Client          rpcclient.Client
-	Decoder         sdk.AccountDecoder
+	Decoder         auth.AccountDecoder
 	AccountStore    string
 }
 
@@ -63,7 +63,7 @@ func (c CoreContext) WithClient(client rpcclient.Client) CoreContext {
 }
 
 // WithDecoder - return a copy of the context with an updated Decoder
-func (c CoreContext) WithDecoder(decoder sdk.AccountDecoder) CoreContext {
+func (c CoreContext) WithDecoder(decoder auth.AccountDecoder) CoreContext {
 	c.Decoder = decoder
 	return c
 }
diff --git a/client/lcd/lcd_test.go b/client/lcd/lcd_test.go
index 66a8a4085f..29b4ba1124 100644
--- a/client/lcd/lcd_test.go
+++ b/client/lcd/lcd_test.go
@@ -35,6 +35,7 @@ import (
 	btypes "github.com/cosmos/cosmos-sdk/examples/basecoin/types"
 	tests "github.com/cosmos/cosmos-sdk/tests"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 var (
@@ -436,11 +437,11 @@ func request(t *testing.T, port, method, path string, payload []byte) (*http.Res
 	return res, string(output)
 }
 
-func getAccount(t *testing.T, sendAddr string) sdk.Account {
+func getAccount(t *testing.T, sendAddr string) auth.Account {
 	// get the account to get the sequence
 	res, body := request(t, port, "GET", "/accounts/"+sendAddr, nil)
 	require.Equal(t, http.StatusOK, res.StatusCode, body)
-	var acc sdk.Account
+	var acc auth.Account
 	err := cdc.UnmarshalJSON([]byte(body), &acc)
 	require.Nil(t, err)
 	return acc
diff --git a/client/tx/query.go b/client/tx/query.go
index 2078b78831..7673dd38db 100644
--- a/client/tx/query.go
+++ b/client/tx/query.go
@@ -17,6 +17,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/context"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/wire"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 // Get the default command for a tx query
@@ -95,7 +96,7 @@ type txInfo struct {
 }
 
 func parseTx(cdc *wire.Codec, txBytes []byte) (sdk.Tx, error) {
-	var tx sdk.StdTx
+	var tx auth.StdTx
 	err := cdc.UnmarshalBinary(txBytes, &tx)
 	if err != nil {
 		return nil, err
diff --git a/cmd/gaia/app/app.go b/cmd/gaia/app/app.go
index 42869c9558..dbecada004 100644
--- a/cmd/gaia/app/app.go
+++ b/cmd/gaia/app/app.go
@@ -14,7 +14,6 @@ import (
 	"github.com/cosmos/cosmos-sdk/wire"
 	"github.com/cosmos/cosmos-sdk/x/auth"
 	"github.com/cosmos/cosmos-sdk/x/bank"
-	feed "github.com/cosmos/cosmos-sdk/x/fee_distribution"
 	"github.com/cosmos/cosmos-sdk/x/ibc"
 	"github.com/cosmos/cosmos-sdk/x/stake"
 )
@@ -41,10 +40,11 @@ type GaiaApp struct {
 	keyStake   *sdk.KVStoreKey
 
 	// Manage getting and setting accounts
-	accountMapper sdk.AccountMapper
-	coinKeeper    bank.Keeper
-	ibcMapper     ibc.Mapper
-	stakeKeeper   stake.Keeper
+	accountMapper       auth.AccountMapper
+	feeCollectionKeeper auth.FeeCollectionKeeper
+	coinKeeper          bank.Keeper
+	ibcMapper           ibc.Mapper
+	stakeKeeper         stake.Keeper
 }
 
 func NewGaiaApp(logger log.Logger, db dbm.DB) *GaiaApp {
@@ -82,7 +82,7 @@ func NewGaiaApp(logger log.Logger, db dbm.DB) *GaiaApp {
 	app.SetInitChainer(app.initChainer)
 	app.SetEndBlocker(stake.NewEndBlocker(app.stakeKeeper))
 	app.MountStoresIAVL(app.keyMain, app.keyAccount, app.keyIBC, app.keyStake)
-	app.SetAnteHandler(auth.NewAnteHandler(app.accountMapper, feed.BurnFeeHandler))
+	app.SetAnteHandler(auth.NewAnteHandler(app.accountMapper, app.feeCollectionKeeper))
 	err := app.LoadLatestVersion(app.keyMain)
 	if err != nil {
 		cmn.Exit(err.Error())
@@ -132,7 +132,7 @@ func (app *GaiaApp) ExportAppStateJSON() (appState json.RawMessage, err error) {
 
 	// iterate to get the accounts
 	accounts := []GenesisAccount{}
-	appendAccount := func(acc sdk.Account) (stop bool) {
+	appendAccount := func(acc auth.Account) (stop bool) {
 		account := NewGenesisAccountI(acc)
 		accounts = append(accounts, account)
 		return false
diff --git a/cmd/gaia/app/app_test.go b/cmd/gaia/app/app_test.go
index 42a56959ca..b6f1c9e03c 100644
--- a/cmd/gaia/app/app_test.go
+++ b/cmd/gaia/app/app_test.go
@@ -38,7 +38,7 @@ var (
 	coins     = sdk.Coins{{"foocoin", 10}}
 	halfCoins = sdk.Coins{{"foocoin", 5}}
 	manyCoins = sdk.Coins{{"foocoin", 1}, {"barcoin", 1}}
-	fee       = sdk.StdFee{
+	fee       = auth.StdFee{
 		sdk.Coins{{"foocoin", 0}},
 		100000,
 	}
@@ -463,17 +463,17 @@ func CheckBalance(t *testing.T, gapp *GaiaApp, addr sdk.Address, balExpected str
 	assert.Equal(t, balExpected, fmt.Sprintf("%v", res2.GetCoins()))
 }
 
-func genTx(msg sdk.Msg, seq []int64, priv ...crypto.PrivKeyEd25519) sdk.StdTx {
-	sigs := make([]sdk.StdSignature, len(priv))
+func genTx(msg sdk.Msg, seq []int64, priv ...crypto.PrivKeyEd25519) auth.StdTx {
+	sigs := make([]auth.StdSignature, len(priv))
 	for i, p := range priv {
-		sigs[i] = sdk.StdSignature{
+		sigs[i] = auth.StdSignature{
 			PubKey:    p.PubKey(),
-			Signature: p.Sign(sdk.StdSignBytes(chainID, seq, fee, msg)),
+			Signature: p.Sign(auth.StdSignBytes(chainID, seq, fee, msg)),
 			Sequence:  seq[i],
 		}
 	}
 
-	return sdk.NewStdTx(msg, fee, sigs)
+	return auth.NewStdTx(msg, fee, sigs)
 
 }
 
diff --git a/cmd/gaia/app/genesis.go b/cmd/gaia/app/genesis.go
index 525fe8ab07..8cf45e84a2 100644
--- a/cmd/gaia/app/genesis.go
+++ b/cmd/gaia/app/genesis.go
@@ -35,7 +35,7 @@ func NewGenesisAccount(acc *auth.BaseAccount) GenesisAccount {
 	}
 }
 
-func NewGenesisAccountI(acc sdk.Account) GenesisAccount {
+func NewGenesisAccountI(acc auth.Account) GenesisAccount {
 	return GenesisAccount{
 		Address: acc.GetAddress(),
 		Coins:   acc.GetCoins(),
diff --git a/examples/basecoin/app/app.go b/examples/basecoin/app/app.go
index b1a434fa2c..086fa32b36 100644
--- a/examples/basecoin/app/app.go
+++ b/examples/basecoin/app/app.go
@@ -35,10 +35,11 @@ type BasecoinApp struct {
 	keyStake   *sdk.KVStoreKey
 
 	// Manage getting and setting accounts
-	accountMapper sdk.AccountMapper
-	coinKeeper    bank.Keeper
-	ibcMapper     ibc.Mapper
-	stakeKeeper   stake.Keeper
+	accountMapper       auth.AccountMapper
+	feeCollectionKeeper auth.FeeCollectionKeeper
+	coinKeeper          bank.Keeper
+	ibcMapper           ibc.Mapper
+	stakeKeeper         stake.Keeper
 }
 
 func NewBasecoinApp(logger log.Logger, db dbm.DB) *BasecoinApp {
@@ -70,7 +71,7 @@ func NewBasecoinApp(logger log.Logger, db dbm.DB) *BasecoinApp {
 
 	// register message routes
 	app.Router().
-		AddRoute("auth", auth.NewHandler(app.accountMapper.(auth.AccountMapper))).
+		AddRoute("auth", auth.NewHandler(app.accountMapper)).
 		AddRoute("bank", bank.NewHandler(app.coinKeeper)).
 		AddRoute("ibc", ibc.NewHandler(app.ibcMapper, app.coinKeeper)).
 		AddRoute("stake", stake.NewHandler(app.stakeKeeper))
@@ -78,7 +79,7 @@ func NewBasecoinApp(logger log.Logger, db dbm.DB) *BasecoinApp {
 	// Initialize BaseApp.
 	app.SetInitChainer(app.initChainer)
 	app.MountStoresIAVL(app.keyMain, app.keyAccount, app.keyIBC, app.keyStake)
-	app.SetAnteHandler(auth.NewAnteHandler(app.accountMapper, auth.BurnFeeHandler))
+	app.SetAnteHandler(auth.NewAnteHandler(app.accountMapper, app.feeCollectionKeeper))
 	err := app.LoadLatestVersion(app.keyMain)
 	if err != nil {
 		cmn.Exit(err.Error())
@@ -96,7 +97,7 @@ func MakeCodec() *wire.Codec {
 	ibc.RegisterWire(cdc)
 
 	// register custom AppAccount
-	cdc.RegisterInterface((*sdk.Account)(nil), nil)
+	cdc.RegisterInterface((*auth.Account)(nil), nil)
 	cdc.RegisterConcrete(&types.AppAccount{}, "basecoin/Account", nil)
 	return cdc
 }
@@ -129,7 +130,7 @@ func (app *BasecoinApp) ExportAppStateJSON() (appState json.RawMessage, err erro
 
 	// iterate to get the accounts
 	accounts := []*types.GenesisAccount{}
-	appendAccount := func(acc sdk.Account) (stop bool) {
+	appendAccount := func(acc auth.Account) (stop bool) {
 		account := &types.GenesisAccount{
 			Address: acc.GetAddress(),
 			Coins:   acc.GetCoins(),
diff --git a/examples/basecoin/app/app_test.go b/examples/basecoin/app/app_test.go
index d0b59f3313..e297288d3f 100644
--- a/examples/basecoin/app/app_test.go
+++ b/examples/basecoin/app/app_test.go
@@ -37,7 +37,7 @@ var (
 	coins     = sdk.Coins{{"foocoin", 10}}
 	halfCoins = sdk.Coins{{"foocoin", 5}}
 	manyCoins = sdk.Coins{{"foocoin", 1}, {"barcoin", 1}}
-	fee       = sdk.StdFee{
+	fee       = auth.StdFee{
 		sdk.Coins{{"foocoin", 0}},
 		100000,
 	}
@@ -471,17 +471,17 @@ func TestIBCMsgs(t *testing.T) {
 	SignCheckDeliver(t, bapp, receiveMsg, []int64{3}, false, priv1)
 }
 
-func genTx(msg sdk.Msg, seq []int64, priv ...crypto.PrivKeyEd25519) sdk.StdTx {
-	sigs := make([]sdk.StdSignature, len(priv))
+func genTx(msg sdk.Msg, seq []int64, priv ...crypto.PrivKeyEd25519) auth.StdTx {
+	sigs := make([]auth.StdSignature, len(priv))
 	for i, p := range priv {
-		sigs[i] = sdk.StdSignature{
+		sigs[i] = auth.StdSignature{
 			PubKey:    p.PubKey(),
-			Signature: p.Sign(sdk.StdSignBytes(chainID, seq, fee, msg)),
+			Signature: p.Sign(auth.StdSignBytes(chainID, seq, fee, msg)),
 			Sequence:  seq[i],
 		}
 	}
 
-	return sdk.NewStdTx(msg, fee, sigs)
+	return auth.NewStdTx(msg, fee, sigs)
 
 }
 
diff --git a/examples/basecoin/types/account.go b/examples/basecoin/types/account.go
index e6eb5d7b46..223e0b9eb1 100644
--- a/examples/basecoin/types/account.go
+++ b/examples/basecoin/types/account.go
@@ -6,7 +6,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
-var _ sdk.Account = (*AppAccount)(nil)
+var _ auth.Account = (*AppAccount)(nil)
 
 // Custom extensions for this application.  This is just an example of
 // extending auth.BaseAccount with custom fields.
@@ -23,8 +23,8 @@ func (acc AppAccount) GetName() string      { return acc.Name }
 func (acc *AppAccount) SetName(name string) { acc.Name = name }
 
 // Get the AccountDecoder function for the custom AppAccount
-func GetAccountDecoder(cdc *wire.Codec) sdk.AccountDecoder {
-	return func(accBytes []byte) (res sdk.Account, err error) {
+func GetAccountDecoder(cdc *wire.Codec) auth.AccountDecoder {
+	return func(accBytes []byte) (res auth.Account, err error) {
 		if len(accBytes) == 0 {
 			return nil, sdk.ErrTxDecode("accBytes are empty")
 		}
diff --git a/examples/democoin/app/app.go b/examples/democoin/app/app.go
index 7c8250b189..2075a64da0 100644
--- a/examples/democoin/app/app.go
+++ b/examples/democoin/app/app.go
@@ -39,14 +39,15 @@ type DemocoinApp struct {
 	capKeyStakingStore *sdk.KVStoreKey
 
 	// keepers
-	coinKeeper  bank.Keeper
-	coolKeeper  cool.Keeper
-	powKeeper   pow.Keeper
-	ibcMapper   ibc.Mapper
-	stakeKeeper simplestake.Keeper
+	feeCollectionKeeper auth.FeeCollectionKeeper
+	coinKeeper          bank.Keeper
+	coolKeeper          cool.Keeper
+	powKeeper           pow.Keeper
+	ibcMapper           ibc.Mapper
+	stakeKeeper         simplestake.Keeper
 
 	// Manage getting and setting accounts
-	accountMapper sdk.AccountMapper
+	accountMapper auth.AccountMapper
 }
 
 func NewDemocoinApp(logger log.Logger, db dbm.DB) *DemocoinApp {
@@ -89,7 +90,7 @@ func NewDemocoinApp(logger log.Logger, db dbm.DB) *DemocoinApp {
 	// Initialize BaseApp.
 	app.SetInitChainer(app.initChainerFn(app.coolKeeper, app.powKeeper))
 	app.MountStoresIAVL(app.capKeyMainStore, app.capKeyAccountStore, app.capKeyPowStore, app.capKeyIBCStore, app.capKeyStakingStore)
-	app.SetAnteHandler(auth.NewAnteHandler(app.accountMapper, auth.BurnFeeHandler))
+	app.SetAnteHandler(auth.NewAnteHandler(app.accountMapper, app.feeCollectionKeeper))
 	err := app.LoadLatestVersion(app.capKeyMainStore)
 	if err != nil {
 		cmn.Exit(err.Error())
@@ -109,7 +110,7 @@ func MakeCodec() *wire.Codec {
 	simplestake.RegisterWire(cdc)
 
 	// Register AppAccount
-	cdc.RegisterInterface((*sdk.Account)(nil), nil)
+	cdc.RegisterInterface((*auth.Account)(nil), nil)
 	cdc.RegisterConcrete(&types.AppAccount{}, "democoin/Account", nil)
 	return cdc
 }
@@ -158,7 +159,7 @@ func (app *DemocoinApp) ExportAppStateJSON() (appState json.RawMessage, err erro
 
 	// iterate to get the accounts
 	accounts := []*types.GenesisAccount{}
-	appendAccount := func(acc sdk.Account) (stop bool) {
+	appendAccount := func(acc auth.Account) (stop bool) {
 		account := &types.GenesisAccount{
 			Address: acc.GetAddress(),
 			Coins:   acc.GetCoins(),
diff --git a/examples/democoin/app/app_test.go b/examples/democoin/app/app_test.go
index b0f188f10b..e025c50627 100644
--- a/examples/democoin/app/app_test.go
+++ b/examples/democoin/app/app_test.go
@@ -31,7 +31,7 @@ var (
 	addr1 = priv1.PubKey().Address()
 	addr2 = crypto.GenPrivKeyEd25519().PubKey().Address()
 	coins = sdk.Coins{{"foocoin", 10}}
-	fee   = sdk.StdFee{
+	fee   = auth.StdFee{
 		sdk.Coins{{"foocoin", 0}},
 		1000000,
 	}
@@ -93,8 +93,8 @@ func TestMsgs(t *testing.T) {
 
 	sequences := []int64{0}
 	for i, m := range msgs {
-		sig := priv1.Sign(sdk.StdSignBytes(chainID, sequences, fee, m.msg))
-		tx := sdk.NewStdTx(m.msg, fee, []sdk.StdSignature{{
+		sig := priv1.Sign(auth.StdSignBytes(chainID, sequences, fee, m.msg))
+		tx := auth.NewStdTx(m.msg, fee, []auth.StdSignature{{
 			PubKey:    priv1.PubKey(),
 			Signature: sig,
 		}})
@@ -194,8 +194,8 @@ func TestMsgSendWithAccounts(t *testing.T) {
 
 	// Sign the tx
 	sequences := []int64{0}
-	sig := priv1.Sign(sdk.StdSignBytes(chainID, sequences, fee, sendMsg))
-	tx := sdk.NewStdTx(sendMsg, fee, []sdk.StdSignature{{
+	sig := priv1.Sign(auth.StdSignBytes(chainID, sequences, fee, sendMsg))
+	tx := auth.NewStdTx(sendMsg, fee, []auth.StdSignature{{
 		PubKey:    priv1.PubKey(),
 		Signature: sig,
 	}})
@@ -227,7 +227,7 @@ func TestMsgSendWithAccounts(t *testing.T) {
 
 	// resigning the tx with the bumped sequence should work
 	sequences = []int64{1}
-	sig = priv1.Sign(sdk.StdSignBytes(chainID, sequences, fee, tx.Msg))
+	sig = priv1.Sign(auth.StdSignBytes(chainID, sequences, fee, tx.Msg))
 	tx.Signatures[0].Signature = sig
 	res = bapp.Deliver(tx)
 	assert.Equal(t, sdk.ABCICodeOK, res.Code, res.Log)
@@ -394,9 +394,9 @@ func TestHandler(t *testing.T) {
 func SignCheckDeliver(t *testing.T, bapp *DemocoinApp, msg sdk.Msg, seq int64, expPass bool) {
 
 	// Sign the tx
-	tx := sdk.NewStdTx(msg, fee, []sdk.StdSignature{{
+	tx := auth.NewStdTx(msg, fee, []auth.StdSignature{{
 		PubKey:    priv1.PubKey(),
-		Signature: priv1.Sign(sdk.StdSignBytes(chainID, []int64{seq}, fee, msg)),
+		Signature: priv1.Sign(auth.StdSignBytes(chainID, []int64{seq}, fee, msg)),
 		Sequence:  seq,
 	}})
 
diff --git a/examples/democoin/types/account.go b/examples/democoin/types/account.go
index 8a744229ad..211cf3c416 100644
--- a/examples/democoin/types/account.go
+++ b/examples/democoin/types/account.go
@@ -9,7 +9,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/examples/democoin/x/pow"
 )
 
-var _ sdk.Account = (*AppAccount)(nil)
+var _ auth.Account = (*AppAccount)(nil)
 
 // Custom extensions for this application.  This is just an example of
 // extending auth.BaseAccount with custom fields.
@@ -26,8 +26,8 @@ func (acc AppAccount) GetName() string      { return acc.Name }
 func (acc *AppAccount) SetName(name string) { acc.Name = name }
 
 // Get the AccountDecoder function for the custom AppAccount
-func GetAccountDecoder(cdc *wire.Codec) sdk.AccountDecoder {
-	return func(accBytes []byte) (res sdk.Account, err error) {
+func GetAccountDecoder(cdc *wire.Codec) auth.AccountDecoder {
+	return func(accBytes []byte) (res auth.Account, err error) {
 		if len(accBytes) == 0 {
 			return nil, sdk.ErrTxDecode("accBytes are empty")
 		}
diff --git a/examples/democoin/x/simplestake/keeper_test.go b/examples/democoin/x/simplestake/keeper_test.go
index 302a2e58b6..515c19cc59 100644
--- a/examples/democoin/x/simplestake/keeper_test.go
+++ b/examples/democoin/x/simplestake/keeper_test.go
@@ -31,10 +31,13 @@ func setupMultiStore() (sdk.MultiStore, *sdk.KVStoreKey, *sdk.KVStoreKey) {
 }
 
 func TestKeeperGetSet(t *testing.T) {
-	ms, _, capKey := setupMultiStore()
+	ms, authKey, capKey := setupMultiStore()
+	cdc := wire.NewCodec()
+	auth.RegisterBaseAccount(cdc)
 
 	ctx := sdk.NewContext(ms, abci.Header{}, false, nil, log.NewNopLogger())
-	stakeKeeper := NewKeeper(capKey, bank.NewKeeper(nil), DefaultCodespace)
+	accountMapper := auth.NewAccountMapper(cdc, authKey, &auth.BaseAccount{})
+	stakeKeeper := NewKeeper(capKey, bank.NewKeeper(accountMapper), DefaultCodespace)
 	addr := sdk.Address([]byte("some-address"))
 
 	bi := stakeKeeper.getBondInfo(ctx, addr)
diff --git a/examples/kvstore/tx.go b/examples/kvstore/tx.go
index 12bce0736f..fa32d93bfb 100644
--- a/examples/kvstore/tx.go
+++ b/examples/kvstore/tx.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 // An sdk.Tx which is its own sdk.Msg.
@@ -34,7 +35,7 @@ func (tx kvstoreTx) GetSigners() []sdk.Address {
 	return nil
 }
 
-func (tx kvstoreTx) GetSignatures() []sdk.StdSignature {
+func (tx kvstoreTx) GetSignatures() []auth.StdSignature {
 	return nil
 }
 
diff --git a/mock/tx.go b/mock/tx.go
index 81dea45718..bd437f2d08 100644
--- a/mock/tx.go
+++ b/mock/tx.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 // An sdk.Tx which is its own sdk.Msg.
@@ -47,7 +48,7 @@ func (tx kvstoreTx) GetSigners() []sdk.Address {
 	return nil
 }
 
-func (tx kvstoreTx) GetSignatures() []sdk.StdSignature {
+func (tx kvstoreTx) GetSignatures() []auth.StdSignature {
 	return nil
 }
 
diff --git a/types/account.go b/types/account.go
index 74cd87f38c..be8b90a1cd 100644
--- a/types/account.go
+++ b/types/account.go
@@ -4,7 +4,6 @@ import (
 	"encoding/hex"
 	"errors"
 
-	crypto "github.com/tendermint/go-crypto"
 	cmn "github.com/tendermint/tmlibs/common"
 )
 
@@ -22,31 +21,3 @@ func GetAddress(address string) (addr Address, err error) {
 	}
 	return Address(bz), nil
 }
-
-// Account is a standard account using a sequence number for replay protection
-// and a pubkey for authentication.
-type Account interface {
-	GetAddress() Address
-	SetAddress(Address) error // errors if already set.
-
-	GetPubKey() crypto.PubKey // can return nil.
-	SetPubKey(crypto.PubKey) error
-
-	GetSequence() int64
-	SetSequence(int64) error
-
-	GetCoins() Coins
-	SetCoins(Coins) error
-}
-
-// AccountMapper stores and retrieves accounts from stores
-// retrieved from the context.
-type AccountMapper interface {
-	NewAccountWithAddress(ctx Context, addr Address) Account
-	GetAccount(ctx Context, addr Address) Account
-	SetAccount(ctx Context, acc Account)
-	IterateAccounts(ctx Context, process func(Account) (stop bool))
-}
-
-// AccountDecoder unmarshals account bytes
-type AccountDecoder func(accountBytes []byte) (Account, error)
diff --git a/types/handler.go b/types/handler.go
index 679a3b1a78..129f42647a 100644
--- a/types/handler.go
+++ b/types/handler.go
@@ -3,8 +3,5 @@ package types
 // core function variable which application runs for transactions
 type Handler func(ctx Context, msg Msg) Result
 
-// core function variable which application runs to handle fees
-type FeeHandler func(ctx Context, tx Tx, fee Coins)
-
 // If newCtx.IsZero(), ctx is used instead.
 type AnteHandler func(ctx Context, tx Tx) (newCtx Context, result Result, abort bool)
diff --git a/types/signature.go b/types/signature.go
deleted file mode 100644
index 5bca2f6069..0000000000
--- a/types/signature.go
+++ /dev/null
@@ -1,10 +0,0 @@
-package types
-
-import crypto "github.com/tendermint/go-crypto"
-
-// Standard Signature
-type StdSignature struct {
-	crypto.PubKey    `json:"pub_key"` // optional
-	crypto.Signature `json:"signature"`
-	Sequence         int64 `json:"sequence"`
-}
diff --git a/types/tx_msg.go b/types/tx_msg.go
index e17d152a5f..186cf9b242 100644
--- a/types/tx_msg.go
+++ b/types/tx_msg.go
@@ -31,123 +31,6 @@ type Tx interface {
 
 	// Gets the Msg.
 	GetMsg() Msg
-
-	// Signatures returns the signature of signers who signed the Msg.
-	// CONTRACT: Length returned is same as length of
-	// pubkeys returned from MsgKeySigners, and the order
-	// matches.
-	// CONTRACT: If the signature is missing (ie the Msg is
-	// invalid), then the corresponding signature is
-	// .Empty().
-	GetSignatures() []StdSignature
-}
-
-var _ Tx = (*StdTx)(nil)
-
-// StdTx is a standard way to wrap a Msg with Fee and Signatures.
-// NOTE: the first signature is the FeePayer (Signatures must not be nil).
-type StdTx struct {
-	Msg        `json:"msg"`
-	Fee        StdFee         `json:"fee"`
-	Signatures []StdSignature `json:"signatures"`
-}
-
-func NewStdTx(msg Msg, fee StdFee, sigs []StdSignature) StdTx {
-	return StdTx{
-		Msg:        msg,
-		Fee:        fee,
-		Signatures: sigs,
-	}
-}
-
-//nolint
-func (tx StdTx) GetMsg() Msg                   { return tx.Msg }
-func (tx StdTx) GetSignatures() []StdSignature { return tx.Signatures }
-
-// FeePayer returns the address responsible for paying the fees
-// for the transactions. It's the first address returned by msg.GetSigners().
-// If GetSigners() is empty, this panics.
-func FeePayer(tx Tx) Address {
-	return tx.GetMsg().GetSigners()[0]
-}
-
-//__________________________________________________________
-
-// StdFee includes the amount of coins paid in fees and the maximum
-// gas to be used by the transaction. The ratio yields an effective "gasprice",
-// which must be above some miminum to be accepted into the mempool.
-type StdFee struct {
-	Amount Coins `json:"amount"`
-	Gas    int64 `json:"gas"`
-}
-
-func NewStdFee(gas int64, amount ...Coin) StdFee {
-	return StdFee{
-		Amount: amount,
-		Gas:    gas,
-	}
-}
-
-// fee bytes for signing later
-func (fee StdFee) Bytes() []byte {
-	// normalize. XXX
-	// this is a sign of something ugly
-	// (in the lcd_test, client side its null,
-	// server side its [])
-	if len(fee.Amount) == 0 {
-		fee.Amount = Coins{}
-	}
-	bz, err := json.Marshal(fee) // TODO
-	if err != nil {
-		panic(err)
-	}
-	return bz
-}
-
-//__________________________________________________________
-
-// StdSignDoc is replay-prevention structure.
-// It includes the result of msg.GetSignBytes(),
-// as well as the ChainID (prevent cross chain replay)
-// and the Sequence numbers for each signature (prevent
-// inchain replay and enforce tx ordering per account).
-type StdSignDoc struct {
-	ChainID   string  `json:"chain_id"`
-	Sequences []int64 `json:"sequences"`
-	FeeBytes  []byte  `json:"fee_bytes"`
-	MsgBytes  []byte  `json:"msg_bytes"`
-	AltBytes  []byte  `json:"alt_bytes"`
-}
-
-// StdSignBytes returns the bytes to sign for a transaction.
-// TODO: change the API to just take a chainID and StdTx ?
-func StdSignBytes(chainID string, sequences []int64, fee StdFee, msg Msg) []byte {
-	bz, err := json.Marshal(StdSignDoc{
-		ChainID:   chainID,
-		Sequences: sequences,
-		FeeBytes:  fee.Bytes(),
-		MsgBytes:  msg.GetSignBytes(),
-	})
-	if err != nil {
-		panic(err)
-	}
-	return bz
-}
-
-// StdSignMsg is a convenience structure for passing along
-// a Msg with the other requirements for a StdSignDoc before
-// it is signed. For use in the CLI.
-type StdSignMsg struct {
-	ChainID   string
-	Sequences []int64
-	Fee       StdFee
-	Msg       Msg
-	// XXX: Alt
-}
-
-// get message bytes
-func (msg StdSignMsg) Bytes() []byte {
-	return StdSignBytes(msg.ChainID, msg.Sequences, msg.Fee, msg.Msg)
 }
 
 //__________________________________________________________
diff --git a/x/auth/baseaccount.go b/x/auth/account.go
similarity index 74%
rename from x/auth/baseaccount.go
rename to x/auth/account.go
index ff907fc387..0ae72a8a64 100644
--- a/x/auth/baseaccount.go
+++ b/x/auth/account.go
@@ -3,16 +3,34 @@ package auth
 import (
 	"errors"
 
-	"github.com/tendermint/go-crypto"
-
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/wire"
+	crypto "github.com/tendermint/go-crypto"
 )
 
+// Account is a standard account using a sequence number for replay protection
+// and a pubkey for authentication.
+type Account interface {
+	GetAddress() sdk.Address
+	SetAddress(sdk.Address) error // errors if already set.
+
+	GetPubKey() crypto.PubKey // can return nil.
+	SetPubKey(crypto.PubKey) error
+
+	GetSequence() int64
+	SetSequence(int64) error
+
+	GetCoins() sdk.Coins
+	SetCoins(sdk.Coins) error
+}
+
+// AccountDecoder unmarshals account bytes
+type AccountDecoder func(accountBytes []byte) (Account, error)
+
 //-----------------------------------------------------------
 // BaseAccount
 
-var _ sdk.Account = (*BaseAccount)(nil)
+var _ Account = (*BaseAccount)(nil)
 
 // BaseAccount - base account structure.
 // Extend this by embedding this in your AppAccount.
@@ -82,7 +100,7 @@ func (acc *BaseAccount) SetSequence(seq int64) error {
 
 // Most users shouldn't use this, but this comes handy for tests.
 func RegisterBaseAccount(cdc *wire.Codec) {
-	cdc.RegisterInterface((*sdk.Account)(nil), nil)
+	cdc.RegisterInterface((*Account)(nil), nil)
 	cdc.RegisterConcrete(&BaseAccount{}, "cosmos-sdk/BaseAccount", nil)
 	wire.RegisterCrypto(cdc)
 }
diff --git a/x/auth/baseaccount_test.go b/x/auth/account_test.go
similarity index 100%
rename from x/auth/baseaccount_test.go
rename to x/auth/account_test.go
diff --git a/x/auth/ante.go b/x/auth/ante.go
index 21d17fb9be..9663bcfe45 100644
--- a/x/auth/ante.go
+++ b/x/auth/ante.go
@@ -9,19 +9,27 @@ import (
 )
 
 const (
-	verifyCost = 100
+	deductFeesCost sdk.Gas = 10
+	verifyCost             = 100
 )
 
 // NewAnteHandler returns an AnteHandler that checks
 // and increments sequence numbers, checks signatures,
 // and deducts fees from the first signer.
-func NewAnteHandler(am sdk.AccountMapper, feeHandler sdk.FeeHandler) sdk.AnteHandler {
+func NewAnteHandler(am AccountMapper, fck FeeCollectionKeeper) sdk.AnteHandler {
+
 	return func(
 		ctx sdk.Context, tx sdk.Tx,
 	) (_ sdk.Context, _ sdk.Result, abort bool) {
 
+		// This AnteHandler requires Txs to be StdTxs
+		stdTx, ok := tx.(StdTx)
+		if !ok {
+			return ctx, sdk.ErrInternal("tx must be StdTx").Result(), true
+		}
+
 		// Assert that there are signatures.
-		var sigs = tx.GetSignatures()
+		var sigs = stdTx.GetSignatures()
 		if len(sigs) == 0 {
 			return ctx,
 				sdk.ErrUnauthorized("no signers").Result(),
@@ -30,12 +38,6 @@ func NewAnteHandler(am sdk.AccountMapper, feeHandler sdk.FeeHandler) sdk.AnteHan
 
 		msg := tx.GetMsg()
 
-		// TODO: will this always be a stdtx? should that be used in the function signature?
-		stdTx, ok := tx.(sdk.StdTx)
-		if !ok {
-			return ctx, sdk.ErrInternal("tx must be sdk.StdTx").Result(), true
-		}
-
 		// Assert that number of signatures is correct.
 		var signerAddrs = msg.GetSigners()
 		if len(sigs) != len(signerAddrs) {
@@ -56,10 +58,10 @@ func NewAnteHandler(am sdk.AccountMapper, feeHandler sdk.FeeHandler) sdk.AnteHan
 		if chainID == "" {
 			chainID = viper.GetString("chain-id")
 		}
-		signBytes := sdk.StdSignBytes(ctx.ChainID(), sequences, fee, msg)
+		signBytes := StdSignBytes(ctx.ChainID(), sequences, fee, msg)
 
 		// Check sig and nonce and collect signer accounts.
-		var signerAccs = make([]sdk.Account, len(signerAddrs))
+		var signerAccs = make([]Account, len(signerAddrs))
 		for i := 0; i < len(sigs); i++ {
 			signerAddr, sig := signerAddrs[i], sigs[i]
 
@@ -76,11 +78,12 @@ func NewAnteHandler(am sdk.AccountMapper, feeHandler sdk.FeeHandler) sdk.AnteHan
 			if i == 0 {
 				// TODO: min fee
 				if !fee.Amount.IsZero() {
+					ctx.GasMeter().ConsumeGas(deductFeesCost, "deductFees")
 					signerAcc, res = deductFees(signerAcc, fee)
-					feeHandler(ctx, tx, fee.Amount)
 					if !res.IsOK() {
 						return ctx, res, true
 					}
+					fck.addCollectedFees(ctx, fee.Amount)
 				}
 			}
 
@@ -104,9 +107,9 @@ func NewAnteHandler(am sdk.AccountMapper, feeHandler sdk.FeeHandler) sdk.AnteHan
 // verify the signature and increment the sequence.
 // if the account doesn't have a pubkey, set it.
 func processSig(
-	ctx sdk.Context, am sdk.AccountMapper,
-	addr sdk.Address, sig sdk.StdSignature, signBytes []byte) (
-	acc sdk.Account, res sdk.Result) {
+	ctx sdk.Context, am AccountMapper,
+	addr sdk.Address, sig StdSignature, signBytes []byte) (
+	acc Account, res sdk.Result) {
 
 	// Get the account.
 	acc = am.GetAccount(ctx, addr)
@@ -152,7 +155,7 @@ func processSig(
 // Deduct the fee from the account.
 // We could use the CoinKeeper (in addition to the AccountMapper,
 // because the CoinKeeper doesn't give us accounts), but it seems easier to do this.
-func deductFees(acc sdk.Account, fee sdk.StdFee) (sdk.Account, sdk.Result) {
+func deductFees(acc Account, fee StdFee) (Account, sdk.Result) {
 	coins := acc.GetCoins()
 	feeAmount := fee.Amount
 
diff --git a/x/auth/ante_test.go b/x/auth/ante_test.go
index ec296b12be..b7f22e5d54 100644
--- a/x/auth/ante_test.go
+++ b/x/auth/ante_test.go
@@ -17,8 +17,8 @@ func newTestMsg(addrs ...sdk.Address) *sdk.TestMsg {
 	return sdk.NewTestMsg(addrs...)
 }
 
-func newStdFee() sdk.StdFee {
-	return sdk.NewStdFee(100,
+func newStdFee() StdFee {
+	return NewStdFee(100,
 		sdk.Coin{"atom", 150},
 	)
 }
@@ -52,28 +52,29 @@ func checkInvalidTx(t *testing.T, anteHandler sdk.AnteHandler, ctx sdk.Context,
 	assert.Equal(t, sdk.ToABCICode(sdk.CodespaceRoot, code), result.Code)
 }
 
-func newTestTx(ctx sdk.Context, msg sdk.Msg, privs []crypto.PrivKey, seqs []int64, fee sdk.StdFee) sdk.Tx {
-	signBytes := sdk.StdSignBytes(ctx.ChainID(), seqs, fee, msg)
+func newTestTx(ctx sdk.Context, msg sdk.Msg, privs []crypto.PrivKey, seqs []int64, fee StdFee) sdk.Tx {
+	signBytes := StdSignBytes(ctx.ChainID(), seqs, fee, msg)
 	return newTestTxWithSignBytes(msg, privs, seqs, fee, signBytes)
 }
 
-func newTestTxWithSignBytes(msg sdk.Msg, privs []crypto.PrivKey, seqs []int64, fee sdk.StdFee, signBytes []byte) sdk.Tx {
-	sigs := make([]sdk.StdSignature, len(privs))
+func newTestTxWithSignBytes(msg sdk.Msg, privs []crypto.PrivKey, seqs []int64, fee StdFee, signBytes []byte) sdk.Tx {
+	sigs := make([]StdSignature, len(privs))
 	for i, priv := range privs {
-		sigs[i] = sdk.StdSignature{PubKey: priv.PubKey(), Signature: priv.Sign(signBytes), Sequence: seqs[i]}
+		sigs[i] = StdSignature{PubKey: priv.PubKey(), Signature: priv.Sign(signBytes), Sequence: seqs[i]}
 	}
-	tx := sdk.NewStdTx(msg, fee, sigs)
+	tx := NewStdTx(msg, fee, sigs)
 	return tx
 }
 
 // Test various error cases in the AnteHandler control flow.
 func TestAnteHandlerSigErrors(t *testing.T) {
 	// setup
-	ms, capKey := setupMultiStore()
+	ms, capKey, capKey2 := setupMultiStore()
 	cdc := wire.NewCodec()
 	RegisterBaseAccount(cdc)
 	mapper := NewAccountMapper(cdc, capKey, &BaseAccount{})
-	anteHandler := NewAnteHandler(mapper, BurnFeeHandler)
+	feeCollector := NewFeeCollectionKeeper(cdc, capKey2)
+	anteHandler := NewAnteHandler(mapper, feeCollector)
 	ctx := sdk.NewContext(ms, abci.Header{ChainID: "mychainid"}, false, nil, log.NewNopLogger())
 
 	// keys and addresses
@@ -110,11 +111,12 @@ func TestAnteHandlerSigErrors(t *testing.T) {
 // Test logic around sequence checking with one signer and many signers.
 func TestAnteHandlerSequences(t *testing.T) {
 	// setup
-	ms, capKey := setupMultiStore()
+	ms, capKey, capKey2 := setupMultiStore()
 	cdc := wire.NewCodec()
 	RegisterBaseAccount(cdc)
 	mapper := NewAccountMapper(cdc, capKey, &BaseAccount{})
-	anteHandler := NewAnteHandler(mapper, BurnFeeHandler)
+	feeCollector := NewFeeCollectionKeeper(cdc, capKey2)
+	anteHandler := NewAnteHandler(mapper, feeCollector)
 	ctx := sdk.NewContext(ms, abci.Header{ChainID: "mychainid"}, false, nil, log.NewNopLogger())
 
 	// keys and addresses
@@ -176,11 +178,12 @@ func TestAnteHandlerSequences(t *testing.T) {
 // Test logic around fee deduction.
 func TestAnteHandlerFees(t *testing.T) {
 	// setup
-	ms, capKey := setupMultiStore()
+	ms, capKey, capKey2 := setupMultiStore()
 	cdc := wire.NewCodec()
 	RegisterBaseAccount(cdc)
 	mapper := NewAccountMapper(cdc, capKey, &BaseAccount{})
-	anteHandler := NewAnteHandler(mapper, BurnFeeHandler)
+	feeCollector := NewFeeCollectionKeeper(cdc, capKey2)
+	anteHandler := NewAnteHandler(mapper, feeCollector)
 	ctx := sdk.NewContext(ms, abci.Header{ChainID: "mychainid"}, false, nil, log.NewNopLogger())
 
 	// keys and addresses
@@ -194,7 +197,7 @@ func TestAnteHandlerFees(t *testing.T) {
 	var tx sdk.Tx
 	msg := newTestMsg(addr1)
 	privs, seqs := []crypto.PrivKey{priv1}, []int64{0}
-	fee := sdk.NewStdFee(100,
+	fee := NewStdFee(100,
 		sdk.Coin{"atom", 150},
 	)
 
@@ -206,18 +209,23 @@ func TestAnteHandlerFees(t *testing.T) {
 	mapper.SetAccount(ctx, acc1)
 	checkInvalidTx(t, anteHandler, ctx, tx, sdk.CodeInsufficientFunds)
 
+	assert.True(t, feeCollector.GetCollectedFees(ctx).IsEqual(emptyCoins))
+
 	acc1.SetCoins(sdk.Coins{{"atom", 150}})
 	mapper.SetAccount(ctx, acc1)
 	checkValidTx(t, anteHandler, ctx, tx)
+
+	assert.True(t, feeCollector.GetCollectedFees(ctx).IsEqual(sdk.Coins{{"atom", 150}}))
 }
 
 func TestAnteHandlerBadSignBytes(t *testing.T) {
 	// setup
-	ms, capKey := setupMultiStore()
+	ms, capKey, capKey2 := setupMultiStore()
 	cdc := wire.NewCodec()
 	RegisterBaseAccount(cdc)
 	mapper := NewAccountMapper(cdc, capKey, &BaseAccount{})
-	anteHandler := NewAnteHandler(mapper, BurnFeeHandler)
+	feeCollector := NewFeeCollectionKeeper(cdc, capKey2)
+	anteHandler := NewAnteHandler(mapper, feeCollector)
 	ctx := sdk.NewContext(ms, abci.Header{ChainID: "mychainid"}, false, nil, log.NewNopLogger())
 
 	// keys and addresses
@@ -252,7 +260,7 @@ func TestAnteHandlerBadSignBytes(t *testing.T) {
 	cases := []struct {
 		chainID string
 		seqs    []int64
-		fee     sdk.StdFee
+		fee     StdFee
 		msg     sdk.Msg
 		code    sdk.CodeType
 	}{
@@ -268,7 +276,7 @@ func TestAnteHandlerBadSignBytes(t *testing.T) {
 	for _, cs := range cases {
 		tx := newTestTxWithSignBytes(
 			msg, privs, seqs, fee,
-			sdk.StdSignBytes(cs.chainID, cs.seqs, cs.fee, cs.msg),
+			StdSignBytes(cs.chainID, cs.seqs, cs.fee, cs.msg),
 		)
 		checkInvalidTx(t, anteHandler, ctx, tx, cs.code)
 	}
@@ -288,11 +296,12 @@ func TestAnteHandlerBadSignBytes(t *testing.T) {
 
 func TestAnteHandlerSetPubKey(t *testing.T) {
 	// setup
-	ms, capKey := setupMultiStore()
+	ms, capKey, capKey2 := setupMultiStore()
 	cdc := wire.NewCodec()
 	RegisterBaseAccount(cdc)
 	mapper := NewAccountMapper(cdc, capKey, &BaseAccount{})
-	anteHandler := NewAnteHandler(mapper, BurnFeeHandler)
+	feeCollector := NewFeeCollectionKeeper(cdc, capKey2)
+	anteHandler := NewAnteHandler(mapper, feeCollector)
 	ctx := sdk.NewContext(ms, abci.Header{ChainID: "mychainid"}, false, nil, log.NewNopLogger())
 
 	// keys and addresses
@@ -322,7 +331,7 @@ func TestAnteHandlerSetPubKey(t *testing.T) {
 	// test public key not found
 	msg = newTestMsg(addr2)
 	tx = newTestTx(ctx, msg, privs, seqs, fee)
-	sigs := tx.GetSignatures()
+	sigs := tx.(StdTx).GetSignatures()
 	sigs[0].PubKey = nil
 	checkInvalidTx(t, anteHandler, ctx, tx, sdk.CodeInvalidPubKey)
 
diff --git a/x/auth/client/cli/account.go b/x/auth/client/cli/account.go
index b45cb12ddf..08bd520fb1 100644
--- a/x/auth/client/cli/account.go
+++ b/x/auth/client/cli/account.go
@@ -9,6 +9,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/context"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/wire"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 // GetAccountCmd for the auth.BaseAccount type
@@ -17,8 +18,8 @@ func GetAccountCmdDefault(storeName string, cdc *wire.Codec) *cobra.Command {
 }
 
 // Get account decoder for auth.DefaultAccount
-func GetAccountDecoder(cdc *wire.Codec) sdk.AccountDecoder {
-	return func(accBytes []byte) (acct sdk.Account, err error) {
+func GetAccountDecoder(cdc *wire.Codec) auth.AccountDecoder {
+	return func(accBytes []byte) (acct auth.Account, err error) {
 		// acct := new(auth.BaseAccount)
 		err = cdc.UnmarshalBinaryBare(accBytes, &acct)
 		if err != nil {
@@ -30,7 +31,7 @@ func GetAccountDecoder(cdc *wire.Codec) sdk.AccountDecoder {
 
 // GetAccountCmd returns a query account that will display the
 // state of the account at a given address
-func GetAccountCmd(storeName string, cdc *wire.Codec, decoder sdk.AccountDecoder) *cobra.Command {
+func GetAccountCmd(storeName string, cdc *wire.Codec, decoder auth.AccountDecoder) *cobra.Command {
 	return &cobra.Command{
 		Use:   "account [address]",
 		Short: "Query account balance",
diff --git a/x/auth/client/rest/query.go b/x/auth/client/rest/query.go
index 52244fec9c..a60ce5cdb2 100644
--- a/x/auth/client/rest/query.go
+++ b/x/auth/client/rest/query.go
@@ -10,19 +10,20 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/context"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/wire"
-	auth "github.com/cosmos/cosmos-sdk/x/auth/client/cli"
+	"github.com/cosmos/cosmos-sdk/x/auth"
+	authcmd "github.com/cosmos/cosmos-sdk/x/auth/client/cli"
 )
 
 // register REST routes
 func RegisterRoutes(ctx context.CoreContext, r *mux.Router, cdc *wire.Codec, storeName string) {
 	r.HandleFunc(
 		"/accounts/{address}",
-		QueryAccountRequestHandlerFn(storeName, cdc, auth.GetAccountDecoder(cdc), ctx),
+		QueryAccountRequestHandlerFn(storeName, cdc, authcmd.GetAccountDecoder(cdc), ctx),
 	).Methods("GET")
 }
 
 // query accountREST Handler
-func QueryAccountRequestHandlerFn(storeName string, cdc *wire.Codec, decoder sdk.AccountDecoder, ctx context.CoreContext) http.HandlerFunc {
+func QueryAccountRequestHandlerFn(storeName string, cdc *wire.Codec, decoder auth.AccountDecoder, ctx context.CoreContext) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		vars := mux.Vars(r)
 		addr := vars["address"]
diff --git a/x/auth/context.go b/x/auth/context.go
index b233f1e861..40fb177858 100644
--- a/x/auth/context.go
+++ b/x/auth/context.go
@@ -34,15 +34,15 @@ const (
 )
 
 // add the signers to the context
-func WithSigners(ctx types.Context, accounts []types.Account) types.Context {
+func WithSigners(ctx types.Context, accounts []Account) types.Context {
 	return ctx.WithValue(contextKeySigners, accounts)
 }
 
 // get the signers from the context
-func GetSigners(ctx types.Context) []types.Account {
+func GetSigners(ctx types.Context) []Account {
 	v := ctx.Value(contextKeySigners)
 	if v == nil {
-		return []types.Account{}
+		return []Account{}
 	}
-	return v.([]types.Account)
+	return v.([]Account)
 }
diff --git a/x/auth/context_test.go b/x/auth/context_test.go
index 89e318e0a1..a93de44d0c 100644
--- a/x/auth/context_test.go
+++ b/x/auth/context_test.go
@@ -12,7 +12,7 @@ import (
 )
 
 func TestContextWithSigners(t *testing.T) {
-	ms, _ := setupMultiStore()
+	ms, _, _ := setupMultiStore()
 	ctx := sdk.NewContext(ms, abci.Header{ChainID: "mychainid"}, false, nil, log.NewNopLogger())
 
 	_, _, addr1 := keyPubAddr()
@@ -26,7 +26,7 @@ func TestContextWithSigners(t *testing.T) {
 	signers := GetSigners(ctx)
 	assert.Equal(t, 0, len(signers))
 
-	ctx2 := WithSigners(ctx, []sdk.Account{&acc1, &acc2})
+	ctx2 := WithSigners(ctx, []Account{&acc1, &acc2})
 
 	// original context is unchanged
 	signers = GetSigners(ctx)
diff --git a/x/auth/feekeeper.go b/x/auth/feekeeper.go
new file mode 100644
index 0000000000..3e03a81aa2
--- /dev/null
+++ b/x/auth/feekeeper.go
@@ -0,0 +1,62 @@
+package auth
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	wire "github.com/cosmos/cosmos-sdk/wire"
+)
+
+var (
+	collectedFeesKey = []byte("collectedFees")
+)
+
+// This FeeCollectionKeeper handles collection of fees in the anteHandler
+// and setting of MinFees for different fee tokens
+type FeeCollectionKeeper struct {
+
+	// The (unexposed) key used to access the fee store from the Context.
+	key sdk.StoreKey
+
+	// The wire codec for binary encoding/decoding of accounts.
+	cdc *wire.Codec
+}
+
+// NewFeeKeeper returns a new FeeKeeper
+func NewFeeCollectionKeeper(cdc *wire.Codec, key sdk.StoreKey) FeeCollectionKeeper {
+	return FeeCollectionKeeper{
+		key: key,
+		cdc: cdc,
+	}
+}
+
+// Adds to Collected Fee Pool
+func (fck FeeCollectionKeeper) GetCollectedFees(ctx sdk.Context) sdk.Coins {
+	store := ctx.KVStore(fck.key)
+	bz := store.Get(collectedFeesKey)
+	if bz == nil {
+		return sdk.Coins{}
+	}
+
+	feePool := &(sdk.Coins{})
+	fck.cdc.MustUnmarshalBinary(bz, feePool)
+	return *feePool
+}
+
+// Sets to Collected Fee Pool
+func (fck FeeCollectionKeeper) setCollectedFees(ctx sdk.Context, coins sdk.Coins) {
+	bz := fck.cdc.MustMarshalBinary(coins)
+	store := ctx.KVStore(fck.key)
+	store.Set(collectedFeesKey, bz)
+}
+
+// Adds to Collected Fee Pool
+func (fck FeeCollectionKeeper) addCollectedFees(ctx sdk.Context, coins sdk.Coins) sdk.Coins {
+	newCoins := fck.GetCollectedFees(ctx).Plus(coins)
+	fck.setCollectedFees(ctx, newCoins)
+
+	return newCoins
+}
+
+// Clears the collected Fee Pool
+func (fck FeeCollectionKeeper) ClearCollectedFees(ctx sdk.Context) {
+	fck.setCollectedFees(ctx, sdk.Coins{})
+}
diff --git a/x/auth/feekeeper_test.go b/x/auth/feekeeper_test.go
new file mode 100644
index 0000000000..2f1ffc59bc
--- /dev/null
+++ b/x/auth/feekeeper_test.go
@@ -0,0 +1,75 @@
+package auth
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	abci "github.com/tendermint/abci/types"
+	"github.com/tendermint/tmlibs/log"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	wire "github.com/cosmos/cosmos-sdk/wire"
+)
+
+var (
+	emptyCoins = sdk.Coins{}
+	oneCoin    = sdk.Coins{{"foocoin", 1}}
+	twoCoins   = sdk.Coins{{"foocoin", 2}}
+)
+
+func TestFeeCollectionKeeperGetSet(t *testing.T) {
+	ms, _, capKey2 := setupMultiStore()
+	cdc := wire.NewCodec()
+
+	// make context and keeper
+	ctx := sdk.NewContext(ms, abci.Header{}, false, nil, log.NewNopLogger())
+	fck := NewFeeCollectionKeeper(cdc, capKey2)
+
+	// no coins initially
+	currFees := fck.GetCollectedFees(ctx)
+	assert.True(t, currFees.IsEqual(emptyCoins))
+
+	// set feeCollection to oneCoin
+	fck.setCollectedFees(ctx, oneCoin)
+
+	// check that it is equal to oneCoin
+	assert.True(t, fck.GetCollectedFees(ctx).IsEqual(oneCoin))
+}
+
+func TestFeeCollectionKeeperAdd(t *testing.T) {
+	ms, _, capKey2 := setupMultiStore()
+	cdc := wire.NewCodec()
+
+	// make context and keeper
+	ctx := sdk.NewContext(ms, abci.Header{}, false, nil, log.NewNopLogger())
+	fck := NewFeeCollectionKeeper(cdc, capKey2)
+
+	// no coins initially
+	assert.True(t, fck.GetCollectedFees(ctx).IsEqual(emptyCoins))
+
+	// add oneCoin and check that pool is now oneCoin
+	fck.addCollectedFees(ctx, oneCoin)
+	assert.True(t, fck.GetCollectedFees(ctx).IsEqual(oneCoin))
+
+	// add oneCoin again and check that pool is now twoCoins
+	fck.addCollectedFees(ctx, oneCoin)
+	assert.True(t, fck.GetCollectedFees(ctx).IsEqual(twoCoins))
+}
+
+func TestFeeCollectionKeeperClear(t *testing.T) {
+	ms, _, capKey2 := setupMultiStore()
+	cdc := wire.NewCodec()
+
+	// make context and keeper
+	ctx := sdk.NewContext(ms, abci.Header{}, false, nil, log.NewNopLogger())
+	fck := NewFeeCollectionKeeper(cdc, capKey2)
+
+	// set coins initially
+	fck.setCollectedFees(ctx, twoCoins)
+	assert.True(t, fck.GetCollectedFees(ctx).IsEqual(twoCoins))
+
+	// clear fees and see that pool is now empty
+	fck.ClearCollectedFees(ctx)
+	assert.True(t, fck.GetCollectedFees(ctx).IsEqual(emptyCoins))
+}
diff --git a/x/auth/handler.go b/x/auth/handler.go
index 8a0e1061ae..764c6f7a28 100644
--- a/x/auth/handler.go
+++ b/x/auth/handler.go
@@ -6,14 +6,14 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
-// NewHandler returns a handler for "auth" type messages.
+// NewHandler returns a handler for "baseaccount" type messages.
 func NewHandler(am AccountMapper) sdk.Handler {
 	return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
 		switch msg := msg.(type) {
 		case MsgChangeKey:
 			return handleMsgChangeKey(ctx, am, msg)
 		default:
-			errMsg := "Unrecognized auth Msg type: " + reflect.TypeOf(msg).Name()
+			errMsg := "Unrecognized baseaccount Msg type: " + reflect.TypeOf(msg).Name()
 			return sdk.ErrUnknownRequest(errMsg).Result()
 		}
 	}
@@ -23,7 +23,7 @@ func NewHandler(am AccountMapper) sdk.Handler {
 // Should be very expensive, because once this happens, an account is un-prunable
 func handleMsgChangeKey(ctx sdk.Context, am AccountMapper, msg MsgChangeKey) sdk.Result {
 
-	err := am.setPubKey(ctx, msg.Address, msg.NewPubKey)
+	err := am.SetPubKey(ctx, msg.Address, msg.NewPubKey)
 	if err != nil {
 		return err.Result()
 	}
diff --git a/x/auth/mapper.go b/x/auth/mapper.go
index 3666f13b69..cdab2480e3 100644
--- a/x/auth/mapper.go
+++ b/x/auth/mapper.go
@@ -9,9 +9,6 @@ import (
 	crypto "github.com/tendermint/go-crypto"
 )
 
-var _ sdk.AccountMapper = (*AccountMapper)(nil)
-
-// Implements sdk.AccountMapper.
 // This AccountMapper encodes/decodes accounts using the
 // go-amino (binary) encoding/decoding library.
 type AccountMapper struct {
@@ -19,8 +16,8 @@ type AccountMapper struct {
 	// The (unexposed) key used to access the store from the Context.
 	key sdk.StoreKey
 
-	// The prototypical sdk.Account concrete type.
-	proto sdk.Account
+	// The prototypical Account concrete type.
+	proto Account
 
 	// The wire codec for binary encoding/decoding of accounts.
 	cdc *wire.Codec
@@ -29,7 +26,7 @@ type AccountMapper struct {
 // NewAccountMapper returns a new sdk.AccountMapper that
 // uses go-amino to (binary) encode and decode concrete sdk.Accounts.
 // nolint
-func NewAccountMapper(cdc *wire.Codec, key sdk.StoreKey, proto sdk.Account) AccountMapper {
+func NewAccountMapper(cdc *wire.Codec, key sdk.StoreKey, proto Account) AccountMapper {
 	return AccountMapper{
 		key:   key,
 		proto: proto,
@@ -38,14 +35,14 @@ func NewAccountMapper(cdc *wire.Codec, key sdk.StoreKey, proto sdk.Account) Acco
 }
 
 // Implaements sdk.AccountMapper.
-func (am AccountMapper) NewAccountWithAddress(ctx sdk.Context, addr sdk.Address) sdk.Account {
+func (am AccountMapper) NewAccountWithAddress(ctx sdk.Context, addr sdk.Address) Account {
 	acc := am.clonePrototype()
 	acc.SetAddress(addr)
 	return acc
 }
 
 // Implements sdk.AccountMapper.
-func (am AccountMapper) GetAccount(ctx sdk.Context, addr sdk.Address) sdk.Account {
+func (am AccountMapper) GetAccount(ctx sdk.Context, addr sdk.Address) Account {
 	store := ctx.KVStore(am.key)
 	bz := store.Get(addr)
 	if bz == nil {
@@ -56,7 +53,7 @@ func (am AccountMapper) GetAccount(ctx sdk.Context, addr sdk.Address) sdk.Accoun
 }
 
 // Implements sdk.AccountMapper.
-func (am AccountMapper) SetAccount(ctx sdk.Context, acc sdk.Account) {
+func (am AccountMapper) SetAccount(ctx sdk.Context, acc Account) {
 	addr := acc.GetAddress()
 	store := ctx.KVStore(am.key)
 	bz := am.encodeAccount(acc)
@@ -64,7 +61,7 @@ func (am AccountMapper) SetAccount(ctx sdk.Context, acc sdk.Account) {
 }
 
 // Implements sdk.AccountMapper.
-func (am AccountMapper) IterateAccounts(ctx sdk.Context, process func(sdk.Account) (stop bool)) {
+func (am AccountMapper) IterateAccounts(ctx sdk.Context, process func(Account) (stop bool)) {
 	store := ctx.KVStore(am.key)
 	iter := store.Iterator(nil, nil)
 	for {
@@ -89,7 +86,8 @@ func (am AccountMapper) GetPubKey(ctx sdk.Context, addr sdk.Address) (crypto.Pub
 	return acc.GetPubKey(), nil
 }
 
-func (am AccountMapper) setPubKey(ctx sdk.Context, addr sdk.Address, newPubKey crypto.PubKey) sdk.Error {
+// Sets the PubKey of the account at address
+func (am AccountMapper) SetPubKey(ctx sdk.Context, addr sdk.Address, newPubKey crypto.PubKey) sdk.Error {
 	acc := am.GetAccount(ctx, addr)
 	if acc == nil {
 		return sdk.ErrUnknownAddress(addr.String())
@@ -122,7 +120,7 @@ func (am AccountMapper) setSequence(ctx sdk.Context, addr sdk.Address, newSequen
 // misc.
 
 // Creates a new struct (or pointer to struct) from am.proto.
-func (am AccountMapper) clonePrototype() sdk.Account {
+func (am AccountMapper) clonePrototype() Account {
 	protoRt := reflect.TypeOf(am.proto)
 	if protoRt.Kind() == reflect.Ptr {
 		protoCrt := protoRt.Elem()
@@ -130,7 +128,7 @@ func (am AccountMapper) clonePrototype() sdk.Account {
 			panic("accountMapper requires a struct proto sdk.Account, or a pointer to one")
 		}
 		protoRv := reflect.New(protoCrt)
-		clone, ok := protoRv.Interface().(sdk.Account)
+		clone, ok := protoRv.Interface().(Account)
 		if !ok {
 			panic(fmt.Sprintf("accountMapper requires a proto sdk.Account, but %v doesn't implement sdk.Account", protoRt))
 		}
@@ -138,14 +136,14 @@ func (am AccountMapper) clonePrototype() sdk.Account {
 	}
 
 	protoRv := reflect.New(protoRt).Elem()
-	clone, ok := protoRv.Interface().(sdk.Account)
+	clone, ok := protoRv.Interface().(Account)
 	if !ok {
 		panic(fmt.Sprintf("accountMapper requires a proto sdk.Account, but %v doesn't implement sdk.Account", protoRt))
 	}
 	return clone
 }
 
-func (am AccountMapper) encodeAccount(acc sdk.Account) []byte {
+func (am AccountMapper) encodeAccount(acc Account) []byte {
 	bz, err := am.cdc.MarshalBinaryBare(acc)
 	if err != nil {
 		panic(err)
@@ -153,7 +151,7 @@ func (am AccountMapper) encodeAccount(acc sdk.Account) []byte {
 	return bz
 }
 
-func (am AccountMapper) decodeAccount(bz []byte) (acc sdk.Account) {
+func (am AccountMapper) decodeAccount(bz []byte) (acc Account) {
 	err := am.cdc.UnmarshalBinaryBare(bz, &acc)
 	if err != nil {
 		panic(err)
diff --git a/x/auth/mapper_test.go b/x/auth/mapper_test.go
index cdd418990a..7f6397069a 100644
--- a/x/auth/mapper_test.go
+++ b/x/auth/mapper_test.go
@@ -14,17 +14,19 @@ import (
 	wire "github.com/cosmos/cosmos-sdk/wire"
 )
 
-func setupMultiStore() (sdk.MultiStore, *sdk.KVStoreKey) {
+func setupMultiStore() (sdk.MultiStore, *sdk.KVStoreKey, *sdk.KVStoreKey) {
 	db := dbm.NewMemDB()
 	capKey := sdk.NewKVStoreKey("capkey")
+	capKey2 := sdk.NewKVStoreKey("capkey2")
 	ms := store.NewCommitMultiStore(db)
 	ms.MountStoreWithDB(capKey, sdk.StoreTypeIAVL, db)
+	ms.MountStoreWithDB(capKey2, sdk.StoreTypeIAVL, db)
 	ms.LoadLatestVersion()
-	return ms, capKey
+	return ms, capKey, capKey2
 }
 
 func TestAccountMapperGetSet(t *testing.T) {
-	ms, capKey := setupMultiStore()
+	ms, capKey, _ := setupMultiStore()
 	cdc := wire.NewCodec()
 	RegisterBaseAccount(cdc)
 
diff --git a/x/auth/msgs.go b/x/auth/msgs.go
index 545b296e5b..c449b837b1 100644
--- a/x/auth/msgs.go
+++ b/x/auth/msgs.go
@@ -3,9 +3,8 @@ package auth
 import (
 	"encoding/json"
 
-	"github.com/tendermint/go-crypto"
-
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	crypto "github.com/tendermint/go-crypto"
 )
 
 // MsgChangeKey - high level transaction of the auth module
diff --git a/x/auth/stdtx.go b/x/auth/stdtx.go
new file mode 100644
index 0000000000..bc01b01490
--- /dev/null
+++ b/x/auth/stdtx.go
@@ -0,0 +1,131 @@
+package auth
+
+import (
+	"encoding/json"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	crypto "github.com/tendermint/go-crypto"
+)
+
+var _ sdk.Tx = (*StdTx)(nil)
+
+// StdTx is a standard way to wrap a Msg with Fee and Signatures.
+// NOTE: the first signature is the FeePayer (Signatures must not be nil).
+type StdTx struct {
+	Msg        sdk.Msg        `json:"msg"`
+	Fee        StdFee         `json:"fee"`
+	Signatures []StdSignature `json:"signatures"`
+}
+
+func NewStdTx(msg sdk.Msg, fee StdFee, sigs []StdSignature) StdTx {
+	return StdTx{
+		Msg:        msg,
+		Fee:        fee,
+		Signatures: sigs,
+	}
+}
+
+//nolint
+func (tx StdTx) GetMsg() sdk.Msg { return tx.Msg }
+
+// Signatures returns the signature of signers who signed the Msg.
+// CONTRACT: Length returned is same as length of
+// pubkeys returned from MsgKeySigners, and the order
+// matches.
+// CONTRACT: If the signature is missing (ie the Msg is
+// invalid), then the corresponding signature is
+// .Empty().
+func (tx StdTx) GetSignatures() []StdSignature { return tx.Signatures }
+
+// FeePayer returns the address responsible for paying the fees
+// for the transactions. It's the first address returned by msg.GetSigners().
+// If GetSigners() is empty, this panics.
+func FeePayer(tx sdk.Tx) sdk.Address {
+	return tx.GetMsg().GetSigners()[0]
+}
+
+//__________________________________________________________
+
+// StdFee includes the amount of coins paid in fees and the maximum
+// gas to be used by the transaction. The ratio yields an effective "gasprice",
+// which must be above some miminum to be accepted into the mempool.
+type StdFee struct {
+	Amount sdk.Coins `json:"amount"`
+	Gas    int64     `json:"gas"`
+}
+
+func NewStdFee(gas int64, amount ...sdk.Coin) StdFee {
+	return StdFee{
+		Amount: amount,
+		Gas:    gas,
+	}
+}
+
+// fee bytes for signing later
+func (fee StdFee) Bytes() []byte {
+	// normalize. XXX
+	// this is a sign of something ugly
+	// (in the lcd_test, client side its null,
+	// server side its [])
+	if len(fee.Amount) == 0 {
+		fee.Amount = sdk.Coins{}
+	}
+	bz, err := json.Marshal(fee) // TODO
+	if err != nil {
+		panic(err)
+	}
+	return bz
+}
+
+//__________________________________________________________
+
+// StdSignDoc is replay-prevention structure.
+// It includes the result of msg.GetSignBytes(),
+// as well as the ChainID (prevent cross chain replay)
+// and the Sequence numbers for each signature (prevent
+// inchain replay and enforce tx ordering per account).
+type StdSignDoc struct {
+	ChainID   string  `json:"chain_id"`
+	Sequences []int64 `json:"sequences"`
+	FeeBytes  []byte  `json:"fee_bytes"`
+	MsgBytes  []byte  `json:"msg_bytes"`
+	AltBytes  []byte  `json:"alt_bytes"`
+}
+
+// StdSignBytes returns the bytes to sign for a transaction.
+// TODO: change the API to just take a chainID and StdTx ?
+func StdSignBytes(chainID string, sequences []int64, fee StdFee, msg sdk.Msg) []byte {
+	bz, err := json.Marshal(StdSignDoc{
+		ChainID:   chainID,
+		Sequences: sequences,
+		FeeBytes:  fee.Bytes(),
+		MsgBytes:  msg.GetSignBytes(),
+	})
+	if err != nil {
+		panic(err)
+	}
+	return bz
+}
+
+// StdSignMsg is a convenience structure for passing along
+// a Msg with the other requirements for a StdSignDoc before
+// it is signed. For use in the CLI.
+type StdSignMsg struct {
+	ChainID   string
+	Sequences []int64
+	Fee       StdFee
+	Msg       sdk.Msg
+	// XXX: Alt
+}
+
+// get message bytes
+func (msg StdSignMsg) Bytes() []byte {
+	return StdSignBytes(msg.ChainID, msg.Sequences, msg.Fee, msg.Msg)
+}
+
+// Standard Signature
+type StdSignature struct {
+	crypto.PubKey    `json:"pub_key"` // optional
+	crypto.Signature `json:"signature"`
+	Sequence         int64 `json:"sequence"`
+}
diff --git a/types/tx_msg_test.go b/x/auth/stdtx_test.go
similarity index 70%
rename from types/tx_msg_test.go
rename to x/auth/stdtx_test.go
index f72cdea26e..412b37c20d 100644
--- a/types/tx_msg_test.go
+++ b/x/auth/stdtx_test.go
@@ -1,4 +1,4 @@
-package types
+package auth
 
 import (
 	"testing"
@@ -6,18 +6,20 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	crypto "github.com/tendermint/go-crypto"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
-func newStdFee() StdFee {
-	return NewStdFee(100,
-		Coin{"atom", 150},
-	)
-}
+// func newStdFee() StdFee {
+// 	return NewStdFee(100,
+// 		Coin{"atom", 150},
+// 	)
+// }
 
 func TestStdTx(t *testing.T) {
 	priv := crypto.GenPrivKeyEd25519()
 	addr := priv.PubKey().Address()
-	msg := NewTestMsg(addr)
+	msg := sdk.NewTestMsg(addr)
 	fee := newStdFee()
 	sigs := []StdSignature{}
 
diff --git a/x/auth/wire.go b/x/auth/wire.go
index 9db1b85cca..42b34b96d5 100644
--- a/x/auth/wire.go
+++ b/x/auth/wire.go
@@ -1,12 +1,12 @@
 package auth
 
 import (
-	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/wire"
 )
 
 // Register concrete types on wire codec for default AppAccount
 func RegisterWire(cdc *wire.Codec) {
-	cdc.RegisterInterface((*sdk.Account)(nil), nil)
+	cdc.RegisterInterface((*Account)(nil), nil)
 	cdc.RegisterConcrete(&BaseAccount{}, "auth/Account", nil)
+	cdc.RegisterConcrete(MsgChangeKey{}, "auth/ChangeKey", nil)
 }
diff --git a/x/bank/keeper.go b/x/bank/keeper.go
index 6ef73c68b6..b14da4d81f 100644
--- a/x/bank/keeper.go
+++ b/x/bank/keeper.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 )
 
 const (
@@ -16,11 +17,11 @@ const (
 
 // Keeper manages transfers between accounts
 type Keeper struct {
-	am sdk.AccountMapper
+	am auth.AccountMapper
 }
 
 // NewKeeper returns a new Keeper
-func NewKeeper(am sdk.AccountMapper) Keeper {
+func NewKeeper(am auth.AccountMapper) Keeper {
 	return Keeper{am: am}
 }
 
@@ -63,11 +64,11 @@ func (keeper Keeper) InputOutputCoins(ctx sdk.Context, inputs []Input, outputs [
 
 // SendKeeper only allows transfers between accounts, without the possibility of creating coins
 type SendKeeper struct {
-	am sdk.AccountMapper
+	am auth.AccountMapper
 }
 
 // NewSendKeeper returns a new Keeper
-func NewSendKeeper(am sdk.AccountMapper) SendKeeper {
+func NewSendKeeper(am auth.AccountMapper) SendKeeper {
 	return SendKeeper{am: am}
 }
 
@@ -95,11 +96,11 @@ func (keeper SendKeeper) InputOutputCoins(ctx sdk.Context, inputs []Input, outpu
 
 // ViewKeeper only allows reading of balances
 type ViewKeeper struct {
-	am sdk.AccountMapper
+	am auth.AccountMapper
 }
 
 // NewViewKeeper returns a new Keeper
-func NewViewKeeper(am sdk.AccountMapper) ViewKeeper {
+func NewViewKeeper(am auth.AccountMapper) ViewKeeper {
 	return ViewKeeper{am: am}
 }
 
@@ -115,7 +116,7 @@ func (keeper ViewKeeper) HasCoins(ctx sdk.Context, addr sdk.Address, amt sdk.Coi
 
 //______________________________________________________________________________________________
 
-func getCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address) sdk.Coins {
+func getCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.Address) sdk.Coins {
 	ctx.GasMeter().ConsumeGas(costGetCoins, "getCoins")
 	acc := am.GetAccount(ctx, addr)
 	if acc == nil {
@@ -124,7 +125,7 @@ func getCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address) sdk.Coins
 	return acc.GetCoins()
 }
 
-func setCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address, amt sdk.Coins) sdk.Error {
+func setCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.Address, amt sdk.Coins) sdk.Error {
 	ctx.GasMeter().ConsumeGas(costSetCoins, "setCoins")
 	acc := am.GetAccount(ctx, addr)
 	if acc == nil {
@@ -136,13 +137,13 @@ func setCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address, amt sdk.C
 }
 
 // HasCoins returns whether or not an account has at least amt coins.
-func hasCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address, amt sdk.Coins) bool {
+func hasCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.Address, amt sdk.Coins) bool {
 	ctx.GasMeter().ConsumeGas(costHasCoins, "hasCoins")
 	return getCoins(ctx, am, addr).IsGTE(amt)
 }
 
 // SubtractCoins subtracts amt from the coins at the addr.
-func subtractCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
+func subtractCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.Address, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
 	ctx.GasMeter().ConsumeGas(costSubtractCoins, "subtractCoins")
 	oldCoins := getCoins(ctx, am, addr)
 	newCoins := oldCoins.Minus(amt)
@@ -155,7 +156,7 @@ func subtractCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address, amt
 }
 
 // AddCoins adds amt to the coins at the addr.
-func addCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
+func addCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.Address, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
 	ctx.GasMeter().ConsumeGas(costAddCoins, "addCoins")
 	oldCoins := getCoins(ctx, am, addr)
 	newCoins := oldCoins.Plus(amt)
@@ -169,7 +170,7 @@ func addCoins(ctx sdk.Context, am sdk.AccountMapper, addr sdk.Address, amt sdk.C
 
 // SendCoins moves coins from one account to another
 // NOTE: Make sure to revert state changes from tx on error
-func sendCoins(ctx sdk.Context, am sdk.AccountMapper, fromAddr sdk.Address, toAddr sdk.Address, amt sdk.Coins) (sdk.Tags, sdk.Error) {
+func sendCoins(ctx sdk.Context, am auth.AccountMapper, fromAddr sdk.Address, toAddr sdk.Address, amt sdk.Coins) (sdk.Tags, sdk.Error) {
 	_, subTags, err := subtractCoins(ctx, am, fromAddr, amt)
 	if err != nil {
 		return nil, err
@@ -185,7 +186,7 @@ func sendCoins(ctx sdk.Context, am sdk.AccountMapper, fromAddr sdk.Address, toAd
 
 // InputOutputCoins handles a list of inputs and outputs
 // NOTE: Make sure to revert state changes from tx on error
-func inputOutputCoins(ctx sdk.Context, am sdk.AccountMapper, inputs []Input, outputs []Output) (sdk.Tags, sdk.Error) {
+func inputOutputCoins(ctx sdk.Context, am auth.AccountMapper, inputs []Input, outputs []Output) (sdk.Tags, sdk.Error) {
 	allTags := sdk.EmptyTags()
 
 	for _, in := range inputs {
diff --git a/x/ibc/client/cli/relay.go b/x/ibc/client/cli/relay.go
index 3a1e63a84a..caf96d60a4 100644
--- a/x/ibc/client/cli/relay.go
+++ b/x/ibc/client/cli/relay.go
@@ -12,6 +12,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/context"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	wire "github.com/cosmos/cosmos-sdk/wire"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 	authcmd "github.com/cosmos/cosmos-sdk/x/auth/client/cli"
 	"github.com/cosmos/cosmos-sdk/x/ibc"
 )
@@ -27,7 +28,7 @@ const (
 type relayCommander struct {
 	cdc       *wire.Codec
 	address   sdk.Address
-	decoder   sdk.AccountDecoder
+	decoder   auth.AccountDecoder
 	mainStore string
 	ibcStore  string
 	accStore  string
diff --git a/x/ibc/ibc_test.go b/x/ibc/ibc_test.go
index 60cc59bad9..e13df4f8dd 100644
--- a/x/ibc/ibc_test.go
+++ b/x/ibc/ibc_test.go
@@ -6,7 +6,7 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	abci "github.com/tendermint/abci/types"
-	"github.com/tendermint/go-crypto"
+	crypto "github.com/tendermint/go-crypto"
 	dbm "github.com/tendermint/tmlibs/db"
 	"github.com/tendermint/tmlibs/log"
 
@@ -49,7 +49,7 @@ func makeCodec() *wire.Codec {
 	cdc.RegisterConcrete(IBCReceiveMsg{}, "test/ibc/IBCReceiveMsg", nil)
 
 	// Register AppAccount
-	cdc.RegisterInterface((*sdk.Account)(nil), nil)
+	cdc.RegisterInterface((*auth.Account)(nil), nil)
 	cdc.RegisterConcrete(&auth.BaseAccount{}, "test/ibc/Account", nil)
 	wire.RegisterCrypto(cdc)
 
diff --git a/x/stake/test_common.go b/x/stake/test_common.go
index 2dac36069e..b7a5152c09 100644
--- a/x/stake/test_common.go
+++ b/x/stake/test_common.go
@@ -72,7 +72,7 @@ func makeTestCodec() *wire.Codec {
 	cdc.RegisterConcrete(MsgUnbond{}, "test/stake/Unbond", nil)
 
 	// Register AppAccount
-	cdc.RegisterInterface((*sdk.Account)(nil), nil)
+	cdc.RegisterInterface((*auth.Account)(nil), nil)
 	cdc.RegisterConcrete(&auth.BaseAccount{}, "test/stake/Account", nil)
 	wire.RegisterCrypto(cdc)
 
@@ -91,7 +91,8 @@ func paramsNoInflation() Params {
 }
 
 // hogpodge of all sorts of input required for testing
-func createTestInput(t *testing.T, isCheckTx bool, initCoins int64) (sdk.Context, sdk.AccountMapper, Keeper) {
+func createTestInput(t *testing.T, isCheckTx bool, initCoins int64) (sdk.Context, auth.AccountMapper, Keeper) {
+
 	keyStake := sdk.NewKVStoreKey("stake")
 	keyAcc := sdk.NewKVStoreKey("acc")