diff --git a/mempool/clist_mempool.go b/mempool/clist_mempool.go
index 8fd8b335c..bbff3b98f 100644
--- a/mempool/clist_mempool.go
+++ b/mempool/clist_mempool.go
@@ -103,8 +103,6 @@ func NewCListMempool(
 	return mempool
 }
 
-// EnableTxsAvailable initializes the TxsAvailable channel,
-// ensuring it will trigger once every height when transactions are available.
 // NOTE: not thread safe - should only be called once, on startup
 func (mem *CListMempool) EnableTxsAvailable() {
 	mem.txsAvailable = make(chan struct{}, 1)
@@ -161,33 +159,26 @@ func (mem *CListMempool) CloseWAL() {
 	mem.wal = nil
 }
 
-// Lock locks the mempool. The consensus must be able to hold lock to safely update.
 func (mem *CListMempool) Lock() {
 	mem.proxyMtx.Lock()
 }
 
-// Unlock unlocks the mempool.
 func (mem *CListMempool) Unlock() {
 	mem.proxyMtx.Unlock()
 }
 
-// Size returns the number of transactions in the mempool.
 func (mem *CListMempool) Size() int {
 	return mem.txs.Len()
 }
 
-// TxsBytes returns the total size of all txs in the mempool.
 func (mem *CListMempool) TxsBytes() int64 {
 	return atomic.LoadInt64(&mem.txsBytes)
 }
 
-// FlushAppConn flushes the mempool connection to ensure async reqResCb calls are
-// done. E.g. from CheckTx.
 func (mem *CListMempool) FlushAppConn() error {
 	return mem.proxyAppConn.FlushSync()
 }
 
-// Flush removes all transactions from the mempool and cache
 func (mem *CListMempool) Flush() {
 	mem.proxyMtx.Lock()
 	defer mem.proxyMtx.Unlock()
@@ -216,19 +207,14 @@ func (mem *CListMempool) TxsWaitChan() <-chan struct{} {
 	return mem.txs.WaitChan()
 }
 
-// CheckTx executes a new transaction against the application to determine its validity
-// and whether it should be added to the mempool.
 // It blocks if we're waiting on Update() or Reap().
 // cb: A callback from the CheckTx command.
 //     It gets called from another goroutine.
 // CONTRACT: Either cb will get called, or err returned.
 func (mem *CListMempool) CheckTx(tx types.Tx, cb func(*abci.Response)) (err error) {
-	return mem.CheckTxWithInfo(tx, cb, TxInfo{PeerID: UnknownPeerID})
+	return mem.CheckTxWithInfo(tx, cb, TxInfo{SenderID: UnknownPeerID})
 }
 
-// CheckTxWithInfo performs the same operation as CheckTx, but with extra meta data about the tx.
-// Currently this metadata is the peer who sent it,
-// used to prevent the tx from being gossiped back to them.
 func (mem *CListMempool) CheckTxWithInfo(tx types.Tx, cb func(*abci.Response), txInfo TxInfo) (err error) {
 	mem.proxyMtx.Lock()
 	// use defer to unlock mutex because application (*local client*) might panic
@@ -266,7 +252,7 @@ func (mem *CListMempool) CheckTxWithInfo(tx types.Tx, cb func(*abci.Response), t
 		// so we only record the sender for txs still in the mempool.
 		if e, ok := mem.txsMap.Load(txKey(tx)); ok {
 			memTx := e.(*clist.CElement).Value.(*mempoolTx)
-			if _, loaded := memTx.senders.LoadOrStore(txInfo.PeerID, true); loaded {
+			if _, loaded := memTx.senders.LoadOrStore(txInfo.SenderID, true); loaded {
 				// TODO: consider punishing peer for dups,
 				// its non-trivial since invalid txs can become valid,
 				// but they can spam the same tx with little cost to them atm.
@@ -297,7 +283,7 @@ func (mem *CListMempool) CheckTxWithInfo(tx types.Tx, cb func(*abci.Response), t
 	}
 
 	reqRes := mem.proxyAppConn.CheckTxAsync(tx)
-	reqRes.SetCallback(mem.reqResCb(tx, txInfo.PeerID, cb))
+	reqRes.SetCallback(mem.reqResCb(tx, txInfo.SenderID, cb))
 
 	return nil
 }
@@ -457,9 +443,6 @@ func (mem *CListMempool) resCbRecheck(req *abci.Request, res *abci.Response) {
 	}
 }
 
-// TxsAvailable returns a channel which fires once for every height,
-// and only when transactions are available in the mempool.
-// NOTE: the returned channel may be nil if EnableTxsAvailable was not called.
 func (mem *CListMempool) TxsAvailable() <-chan struct{} {
 	return mem.txsAvailable
 }
@@ -478,10 +461,6 @@ func (mem *CListMempool) notifyTxsAvailable() {
 	}
 }
 
-// ReapMaxBytesMaxGas reaps transactions from the mempool up to maxBytes bytes total
-// with the condition that the total gasWanted must be less than maxGas.
-// If both maxes are negative, there is no cap on the size of all returned
-// transactions (~ all available transactions).
 func (mem *CListMempool) ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs {
 	mem.proxyMtx.Lock()
 	defer mem.proxyMtx.Unlock()
@@ -519,9 +498,6 @@ func (mem *CListMempool) ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs {
 	return txs
 }
 
-// ReapMaxTxs reaps up to max transactions from the mempool.
-// If max is negative, there is no cap on the size of all returned
-// transactions (~ all available transactions).
 func (mem *CListMempool) ReapMaxTxs(max int) types.Txs {
 	mem.proxyMtx.Lock()
 	defer mem.proxyMtx.Unlock()
@@ -543,9 +519,6 @@ func (mem *CListMempool) ReapMaxTxs(max int) types.Txs {
 	return txs
 }
 
-// Update informs the mempool that the given txs were committed and can be discarded.
-// NOTE: this should be called *after* block is committed by consensus.
-// NOTE: unsafe; Lock/Unlock must be managed by caller
 func (mem *CListMempool) Update(
 	height int64,
 	txs types.Txs,
diff --git a/mempool/clist_mempool_test.go b/mempool/clist_mempool_test.go
index e3f98230d..69d4eb68c 100644
--- a/mempool/clist_mempool_test.go
+++ b/mempool/clist_mempool_test.go
@@ -68,7 +68,7 @@ func ensureFire(t *testing.T, ch <-chan struct{}, timeoutMS int) {
 
 func checkTxs(t *testing.T, mempool Mempool, count int, peerID uint16) types.Txs {
 	txs := make(types.Txs, count)
-	txInfo := TxInfo{PeerID: peerID}
+	txInfo := TxInfo{SenderID: peerID}
 	for i := 0; i < count; i++ {
 		txBytes := make([]byte, 20)
 		txs[i] = txBytes
@@ -541,7 +541,7 @@ func TestMempoolRemoteAppConcurrency(t *testing.T) {
 		tx := txs[int(txNum)]
 
 		// this will err with ErrTxInCache many times ...
-		mempool.CheckTxWithInfo(tx, nil, TxInfo{PeerID: uint16(peerID)})
+		mempool.CheckTxWithInfo(tx, nil, TxInfo{SenderID: uint16(peerID)})
 	}
 	err := mempool.FlushAppConn()
 	require.NoError(t, err)
diff --git a/mempool/mempool.go b/mempool/mempool.go
index 8f3c0e63a..6a789f26d 100644
--- a/mempool/mempool.go
+++ b/mempool/mempool.go
@@ -4,31 +4,77 @@ import (
 	"fmt"
 
 	abci "github.com/tendermint/tendermint/abci/types"
+	"github.com/tendermint/tendermint/libs/clist"
 	"github.com/tendermint/tendermint/types"
 )
 
 // Mempool defines the mempool interface.
+//
 // Updates to the mempool need to be synchronized with committing a block so
 // apps can reset their transient state on Commit.
 type Mempool interface {
-	Lock()
-	Unlock()
+	// CheckTx executes a new transaction against the application to determine
+	// its validity and whether it should be added to the mempool.
+	CheckTx(tx types.Tx, callback func(*abci.Response)) error
 
-	Size() int
-
-	CheckTx(types.Tx, func(*abci.Response)) error
-	CheckTxWithInfo(types.Tx, func(*abci.Response), TxInfo) error
+	// CheckTxWithInfo performs the same operation as CheckTx, but with extra
+	// meta data about the tx.
+	// Currently this metadata is the peer who sent it, used to prevent the tx
+	// from being gossiped back to them.
+	CheckTxWithInfo(tx types.Tx, callback func(*abci.Response), txInfo TxInfo) error
 
+	// ReapMaxBytesMaxGas reaps transactions from the mempool up to maxBytes
+	// bytes total with the condition that the total gasWanted must be less than
+	// maxGas.
+	// If both maxes are negative, there is no cap on the size of all returned
+	// transactions (~ all available transactions).
 	ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs
 
-	Update(int64, types.Txs, PreCheckFunc, PostCheckFunc) error
-	Flush()
+	// ReapMaxTxs reaps up to max transactions from the mempool.
+	// If max is negative, there is no cap on the size of all returned
+	// transactions (~ all available transactions).
+	ReapMaxTxs(max int) types.Txs
+
+	// UNSAFE
+	TxsWaitChan() <-chan struct{}
+	TxsFront() *clist.CElement
+
+	// Lock locks the mempool. The consensus must be able to hold lock to safely update.
+	Lock()
+
+	// Unlock unlocks the mempool.
+	Unlock()
+
+	// Update informs the mempool that the given txs were committed and can be discarded.
+	// NOTE: this should be called *after* block is committed by consensus.
+	// NOTE: unsafe; Lock/Unlock must be managed by caller
+	Update(blockHeight int64, blockTxs types.Txs, newPreFn PreCheckFunc, newPostFn PostCheckFunc) error
+
+	// FlushAppConn flushes the mempool connection to ensure async reqResCb calls are
+	// done. E.g. from CheckTx.
 	FlushAppConn() error
 
+	// Flush removes all transactions from the mempool and cache
+	Flush()
+
+	// TxsAvailable returns a channel which fires once for every height,
+	// and only when transactions are available in the mempool.
+	// NOTE: the returned channel may be nil if EnableTxsAvailable was not called.
 	TxsAvailable() <-chan struct{}
+
+	// EnableTxsAvailable initializes the TxsAvailable channel, ensuring it will
+	// trigger once every height when transactions are available.
 	EnableTxsAvailable()
+
+	// Size returns the number of transactions in the mempool.
+	Size() int
+
+	// TxsBytes returns the total size of all txs in the mempool.
+	TxsBytes() int64
 }
 
+//--------------------------------------------------------------------------------
+
 // PreCheckFunc is an optional filter executed before CheckTx and rejects
 // transaction if false is returned. An example would be to ensure that a
 // transaction doesn't exceeded the block size.
@@ -44,7 +90,7 @@ type PostCheckFunc func(types.Tx, *abci.ResponseCheckTx) error
 type TxInfo struct {
 	// We don't use p2p.ID here because it's too big. The gain is to store max 2
 	// bytes with each tx to identify the sender rather than 20 bytes.
-	PeerID uint16
+	SenderID uint16
 }
 
 //--------------------------------------------------------------------------------
diff --git a/mempool/mock/mempool.go b/mempool/mock/mempool.go
index 97cc79e6a..0a94dde06 100644
--- a/mempool/mock/mempool.go
+++ b/mempool/mock/mempool.go
@@ -2,6 +2,7 @@ package mock
 
 import (
 	abci "github.com/tendermint/tendermint/abci/types"
+	"github.com/tendermint/tendermint/libs/clist"
 	mempl "github.com/tendermint/tendermint/mempool"
 	"github.com/tendermint/tendermint/types"
 )
@@ -22,6 +23,7 @@ func (Mempool) CheckTxWithInfo(_ types.Tx, _ func(*abci.Response),
 	return nil
 }
 func (Mempool) ReapMaxBytesMaxGas(_, _ int64) types.Txs { return types.Txs{} }
+func (Mempool) ReapMaxTxs(n int) types.Txs              { return types.Txs{} }
 func (Mempool) Update(
 	_ int64,
 	_ types.Txs,
@@ -34,3 +36,7 @@ func (Mempool) Flush()                        {}
 func (Mempool) FlushAppConn() error           { return nil }
 func (Mempool) TxsAvailable() <-chan struct{} { return make(chan struct{}) }
 func (Mempool) EnableTxsAvailable()           {}
+func (Mempool) TxsBytes() int64               { return 0 }
+
+func (Mempool) TxsFront() *clist.CElement    { return nil }
+func (Mempool) TxsWaitChan() <-chan struct{} { return nil }
diff --git a/mempool/reactor.go b/mempool/reactor.go
index d7581ae68..65631b0cc 100644
--- a/mempool/reactor.go
+++ b/mempool/reactor.go
@@ -31,25 +31,13 @@ const (
 	maxActiveIDs = math.MaxUint16
 )
 
-// MempoolWithWait extends the standard Mempool interface to allow reactor to
-// wait for transactions and iterate on them once there are any. Also it
-// includes ReapMaxTxs function, which is useful for testing.
-//
-// UNSTABLE
-type MempoolWithWait interface {
-	Mempool
-	TxsFront() *clist.CElement
-	TxsWaitChan() <-chan struct{}
-	ReapMaxTxs(n int) types.Txs
-}
-
-// MempoolReactor handles mempool tx broadcasting amongst peers.
+// Reactor handles mempool tx broadcasting amongst peers.
 // It maintains a map from peer ID to counter, to prevent gossiping txs to the
 // peers you received it from.
-type MempoolReactor struct {
+type Reactor struct {
 	p2p.BaseReactor
 	config  *cfg.MempoolConfig
-	Mempool MempoolWithWait
+	mempool Mempool
 	ids     *mempoolIDs
 }
 
@@ -116,14 +104,14 @@ func newMempoolIDs() *mempoolIDs {
 	}
 }
 
-// NewMempoolReactor returns a new MempoolReactor with the given config and mempool.
-func NewMempoolReactor(config *cfg.MempoolConfig, mempool MempoolWithWait) *MempoolReactor {
-	memR := &MempoolReactor{
+// NewReactor returns a new Reactor with the given config and mempool.
+func NewReactor(config *cfg.MempoolConfig, mempool Mempool) *Reactor {
+	memR := &Reactor{
 		config:  config,
-		Mempool: mempool,
+		mempool: mempool,
 		ids:     newMempoolIDs(),
 	}
-	memR.BaseReactor = *p2p.NewBaseReactor("MempoolReactor", memR)
+	memR.BaseReactor = *p2p.NewBaseReactor("Reactor", memR)
 	return memR
 }
 
@@ -131,18 +119,18 @@ type mempoolWithLogger interface {
 	SetLogger(log.Logger)
 }
 
-// SetLogger sets the Logger on the reactor and the underlying Mempool.
-func (memR *MempoolReactor) SetLogger(l log.Logger) {
+// SetLogger sets the Logger on the reactor and the underlying mempool.
+func (memR *Reactor) SetLogger(l log.Logger) {
 	memR.Logger = l
 
 	// set mempoolWithLogger if mempool supports it
-	if mem, ok := memR.Mempool.(mempoolWithLogger); ok {
+	if mem, ok := memR.mempool.(mempoolWithLogger); ok {
 		mem.SetLogger(l)
 	}
 }
 
 // OnStart implements p2p.BaseReactor.
-func (memR *MempoolReactor) OnStart() error {
+func (memR *Reactor) OnStart() error {
 	if !memR.config.Broadcast {
 		memR.Logger.Info("Tx broadcasting is disabled")
 	}
@@ -151,7 +139,7 @@ func (memR *MempoolReactor) OnStart() error {
 
 // GetChannels implements Reactor.
 // It returns the list of channels for this reactor.
-func (memR *MempoolReactor) GetChannels() []*p2p.ChannelDescriptor {
+func (memR *Reactor) GetChannels() []*p2p.ChannelDescriptor {
 	return []*p2p.ChannelDescriptor{
 		{
 			ID:       MempoolChannel,
@@ -162,20 +150,20 @@ func (memR *MempoolReactor) GetChannels() []*p2p.ChannelDescriptor {
 
 // AddPeer implements Reactor.
 // It starts a broadcast routine ensuring all txs are forwarded to the given peer.
-func (memR *MempoolReactor) AddPeer(peer p2p.Peer) {
+func (memR *Reactor) AddPeer(peer p2p.Peer) {
 	memR.ids.ReserveForPeer(peer)
 	go memR.broadcastTxRoutine(peer)
 }
 
 // RemovePeer implements Reactor.
-func (memR *MempoolReactor) RemovePeer(peer p2p.Peer, reason interface{}) {
+func (memR *Reactor) RemovePeer(peer p2p.Peer, reason interface{}) {
 	memR.ids.Reclaim(peer)
 	// broadcast routine checks if peer is gone and returns
 }
 
 // Receive implements Reactor.
 // It adds any received transactions to the mempool.
-func (memR *MempoolReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
+func (memR *Reactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
 	msg, err := decodeMsg(msgBytes)
 	if err != nil {
 		memR.Logger.Error("Error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
@@ -187,7 +175,7 @@ func (memR *MempoolReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
 	switch msg := msg.(type) {
 	case *TxMessage:
 		peerID := memR.ids.GetForPeer(src)
-		err := memR.Mempool.CheckTxWithInfo(msg.Tx, nil, TxInfo{PeerID: peerID})
+		err := memR.mempool.CheckTxWithInfo(msg.Tx, nil, TxInfo{SenderID: peerID})
 		if err != nil {
 			memR.Logger.Info("Could not check tx", "tx", txID(msg.Tx), "err", err)
 		}
@@ -203,7 +191,7 @@ type PeerState interface {
 }
 
 // Send new mempool txs to peer.
-func (memR *MempoolReactor) broadcastTxRoutine(peer p2p.Peer) {
+func (memR *Reactor) broadcastTxRoutine(peer p2p.Peer) {
 	if !memR.config.Broadcast {
 		return
 	}
@@ -220,8 +208,8 @@ func (memR *MempoolReactor) broadcastTxRoutine(peer p2p.Peer) {
 		// start from the beginning.
 		if next == nil {
 			select {
-			case <-memR.Mempool.TxsWaitChan(): // Wait until a tx is available
-				if next = memR.Mempool.TxsFront(); next == nil {
+			case <-memR.mempool.TxsWaitChan(): // Wait until a tx is available
+				if next = memR.mempool.TxsFront(); next == nil {
 					continue
 				}
 			case <-peer.Quit():
@@ -275,7 +263,7 @@ func (memR *MempoolReactor) broadcastTxRoutine(peer p2p.Peer) {
 //-----------------------------------------------------------------------------
 // Messages
 
-// MempoolMessage is a message sent or received by the MempoolReactor.
+// MempoolMessage is a message sent or received by the Reactor.
 type MempoolMessage interface{}
 
 func RegisterMempoolMessages(cdc *amino.Codec) {
diff --git a/mempool/reactor_test.go b/mempool/reactor_test.go
index c9cf49809..40bcf83ef 100644
--- a/mempool/reactor_test.go
+++ b/mempool/reactor_test.go
@@ -43,8 +43,8 @@ func mempoolLogger() log.Logger {
 }
 
 // connect N mempool reactors through N switches
-func makeAndConnectMempoolReactors(config *cfg.Config, N int) []*MempoolReactor {
-	reactors := make([]*MempoolReactor, N)
+func makeAndConnectReactors(config *cfg.Config, N int) []*Reactor {
+	reactors := make([]*Reactor, N)
 	logger := mempoolLogger()
 	for i := 0; i < N; i++ {
 		app := kvstore.NewKVStoreApplication()
@@ -52,7 +52,7 @@ func makeAndConnectMempoolReactors(config *cfg.Config, N int) []*MempoolReactor
 		mempool, cleanup := newMempoolWithApp(cc)
 		defer cleanup()
 
-		reactors[i] = NewMempoolReactor(config.Mempool, mempool) // so we dont start the consensus states
+		reactors[i] = NewReactor(config.Mempool, mempool) // so we dont start the consensus states
 		reactors[i].SetLogger(logger.With("validator", i))
 	}
 
@@ -65,7 +65,7 @@ func makeAndConnectMempoolReactors(config *cfg.Config, N int) []*MempoolReactor
 }
 
 // wait for all txs on all reactors
-func waitForTxs(t *testing.T, txs types.Txs, reactors []*MempoolReactor) {
+func waitForTxs(t *testing.T, txs types.Txs, reactors []*Reactor) {
 	// wait for the txs in all mempools
 	wg := new(sync.WaitGroup)
 	for i := 0; i < len(reactors); i++ {
@@ -88,9 +88,9 @@ func waitForTxs(t *testing.T, txs types.Txs, reactors []*MempoolReactor) {
 }
 
 // wait for all txs on a single mempool
-func _waitForTxs(t *testing.T, wg *sync.WaitGroup, txs types.Txs, reactorIdx int, reactors []*MempoolReactor) {
+func _waitForTxs(t *testing.T, wg *sync.WaitGroup, txs types.Txs, reactorIdx int, reactors []*Reactor) {
 
-	mempool := reactors[reactorIdx].Mempool
+	mempool := reactors[reactorIdx].mempool
 	for mempool.Size() != len(txs) {
 		time.Sleep(time.Millisecond * 100)
 	}
@@ -103,9 +103,9 @@ func _waitForTxs(t *testing.T, wg *sync.WaitGroup, txs types.Txs, reactorIdx int
 }
 
 // ensure no txs on reactor after some timeout
-func ensureNoTxs(t *testing.T, reactor *MempoolReactor, timeout time.Duration) {
+func ensureNoTxs(t *testing.T, reactor *Reactor, timeout time.Duration) {
 	time.Sleep(timeout) // wait for the txs in all mempools
-	assert.Zero(t, reactor.Mempool.Size())
+	assert.Zero(t, reactor.mempool.Size())
 }
 
 const (
@@ -116,7 +116,7 @@ const (
 func TestReactorBroadcastTxMessage(t *testing.T) {
 	config := cfg.TestConfig()
 	const N = 4
-	reactors := makeAndConnectMempoolReactors(config, N)
+	reactors := makeAndConnectReactors(config, N)
 	defer func() {
 		for _, r := range reactors {
 			r.Stop()
@@ -130,14 +130,14 @@ func TestReactorBroadcastTxMessage(t *testing.T) {
 
 	// send a bunch of txs to the first reactor's mempool
 	// and wait for them all to be received in the others
-	txs := checkTxs(t, reactors[0].Mempool, NUM_TXS, UnknownPeerID)
+	txs := checkTxs(t, reactors[0].mempool, NUM_TXS, UnknownPeerID)
 	waitForTxs(t, txs, reactors)
 }
 
 func TestReactorNoBroadcastToSender(t *testing.T) {
 	config := cfg.TestConfig()
 	const N = 2
-	reactors := makeAndConnectMempoolReactors(config, N)
+	reactors := makeAndConnectReactors(config, N)
 	defer func() {
 		for _, r := range reactors {
 			r.Stop()
@@ -146,7 +146,7 @@ func TestReactorNoBroadcastToSender(t *testing.T) {
 
 	// send a bunch of txs to the first reactor's mempool, claiming it came from peer
 	// ensure peer gets no txs
-	checkTxs(t, reactors[0].Mempool, NUM_TXS, 1)
+	checkTxs(t, reactors[0].mempool, NUM_TXS, 1)
 	ensureNoTxs(t, reactors[1], 100*time.Millisecond)
 }
 
@@ -157,7 +157,7 @@ func TestBroadcastTxForPeerStopsWhenPeerStops(t *testing.T) {
 
 	config := cfg.TestConfig()
 	const N = 2
-	reactors := makeAndConnectMempoolReactors(config, N)
+	reactors := makeAndConnectReactors(config, N)
 	defer func() {
 		for _, r := range reactors {
 			r.Stop()
@@ -180,7 +180,7 @@ func TestBroadcastTxForPeerStopsWhenReactorStops(t *testing.T) {
 
 	config := cfg.TestConfig()
 	const N = 2
-	reactors := makeAndConnectMempoolReactors(config, N)
+	reactors := makeAndConnectReactors(config, N)
 
 	// stop reactors
 	for _, r := range reactors {
diff --git a/node/node.go b/node/node.go
index 49fd17a19..6f4d64242 100644
--- a/node/node.go
+++ b/node/node.go
@@ -159,7 +159,7 @@ type Node struct {
 	stateDB          dbm.DB
 	blockStore       *bc.BlockStore        // store the blockchain to disk
 	bcReactor        *bc.BlockchainReactor // for fast-syncing
-	mempoolReactor   *mempl.MempoolReactor // for gossipping transactions
+	mempoolReactor   *mempl.Reactor        // for gossipping transactions
 	mempool          *mempl.CListMempool
 	consensusState   *cs.ConsensusState     // latest consensus state
 	consensusReactor *cs.ConsensusReactor   // for participating in the consensus
@@ -320,7 +320,7 @@ func NewNode(config *cfg.Config,
 
 	csMetrics, p2pMetrics, memplMetrics, smMetrics := metricsProvider(genDoc.ChainID)
 
-	// Make MempoolReactor
+	// Make Mempool Reactor
 	mempool := mempl.NewCListMempool(
 		config.Mempool,
 		proxyApp.Mempool(),
@@ -333,7 +333,7 @@ func NewNode(config *cfg.Config,
 	if config.Mempool.WalEnabled() {
 		mempool.InitWAL() // no need to have the mempool wal during tests
 	}
-	mempoolReactor := mempl.NewMempoolReactor(config.Mempool, mempool)
+	mempoolReactor := mempl.NewReactor(config.Mempool, mempool)
 	mempoolReactor.SetLogger(mempoolLogger)
 
 	if config.Consensus.WaitForTxs() {
@@ -800,12 +800,12 @@ func (n *Node) ConsensusReactor() *cs.ConsensusReactor {
 	return n.consensusReactor
 }
 
-// MempoolReactor returns the Node's MempoolReactor.
-func (n *Node) MempoolReactor() *mempl.MempoolReactor {
+// MempoolReactor returns the Node's mempool reactor.
+func (n *Node) MempoolReactor() *mempl.Reactor {
 	return n.mempoolReactor
 }
 
-// Mempool returns the Node's Mempool.
+// Mempool returns the Node's mempool.
 func (n *Node) Mempool() *mempl.CListMempool {
 	return n.mempool
 }
diff --git a/rpc/core/pipe.go b/rpc/core/pipe.go
index ab2316a38..e19dbf969 100644
--- a/rpc/core/pipe.go
+++ b/rpc/core/pipe.go
@@ -49,14 +49,6 @@ type peers interface {
 	Peers() p2p.IPeerSet
 }
 
-// Mempool extends the standard Mempool interface to allow getting
-// total txs size. ReapMaxTxs is used by UnconfirmedTxs to reap N transactions.
-type Mempool interface {
-	mempl.Mempool
-	ReapMaxTxs(n int) types.Txs
-	TxsBytes() int64
-}
-
 //----------------------------------------------
 // These package level globals come with setters
 // that are expected to be called only once, on startup
@@ -80,7 +72,7 @@ var (
 	txIndexer        txindex.TxIndexer
 	consensusReactor *consensus.ConsensusReactor
 	eventBus         *types.EventBus // thread safe
-	mempool          Mempool
+	mempool          mempl.Mempool
 
 	logger log.Logger
 
@@ -95,7 +87,7 @@ func SetBlockStore(bs sm.BlockStore) {
 	blockStore = bs
 }
 
-func SetMempool(mem Mempool) {
+func SetMempool(mem mempl.Mempool) {
 	mempool = mem
 }