diff --git a/consensus/mempool_test.go b/consensus/mempool_test.go
index d12388727..d298b5cb4 100644
--- a/consensus/mempool_test.go
+++ b/consensus/mempool_test.go
@@ -23,8 +23,8 @@ func TestTxConcurrentWithCommit(t *testing.T) {
 	height, round := cs.Height, cs.Round
 	newBlockCh := subscribeToEvent(cs.evsw, "tester", types.EventStringNewBlock(), 1)
 
-	appendTxsRange := func(start, end int) {
-		// Append some txs.
+	deliverTxsRange := func(start, end int) {
+		// Deliver some txs.
 		for i := start; i < end; i++ {
 			txBytes := make([]byte, 8)
 			binary.BigEndian.PutUint64(txBytes, uint64(i))
@@ -37,7 +37,7 @@ func TestTxConcurrentWithCommit(t *testing.T) {
 	}
 
 	NTxs := 10000
-	go appendTxsRange(0, NTxs)
+	go deliverTxsRange(0, NTxs)
 
 	startTestRound(cs, height, round)
 	ticker := time.NewTicker(time.Second * 20)
@@ -59,7 +59,7 @@ func TestRmBadTx(t *testing.T) {
 	// increment the counter by 1
 	txBytes := make([]byte, 8)
 	binary.BigEndian.PutUint64(txBytes, uint64(0))
-	app.AppendTx(txBytes)
+	app.DeliverTx(txBytes)
 	app.Commit()
 
 	ch := make(chan struct{})
@@ -130,7 +130,7 @@ func (app *CounterApplication) SetOption(key string, value string) (log string)
 	return ""
 }
 
-func (app *CounterApplication) AppendTx(tx []byte) abci.Result {
+func (app *CounterApplication) DeliverTx(tx []byte) abci.Result {
 	return runTx(tx, &app.txCount)
 }
 
diff --git a/mempool/mempool_test.go b/mempool/mempool_test.go
index d5816371f..9ac8fe33d 100644
--- a/mempool/mempool_test.go
+++ b/mempool/mempool_test.go
@@ -20,8 +20,8 @@ func TestSerialReap(t *testing.T) {
 	appConnCon, _ := cc.NewABCIClient()
 	mempool := NewMempool(config, appConnMem)
 
-	appendTxsRange := func(start, end int) {
-		// Append some txs.
+	deliverTxsRange := func(start, end int) {
+		// Deliver some txs.
 		for i := start; i < end; i++ {
 
 			// This will succeed
@@ -61,11 +61,11 @@ func TestSerialReap(t *testing.T) {
 	}
 
 	commitRange := func(start, end int) {
-		// Append some txs.
+		// Deliver some txs.
 		for i := start; i < end; i++ {
 			txBytes := make([]byte, 8)
 			binary.BigEndian.PutUint64(txBytes, uint64(i))
-			res := appConnCon.AppendTxSync(txBytes)
+			res := appConnCon.DeliverTxSync(txBytes)
 			if !res.IsOK() {
 				t.Errorf("Error committing tx. Code:%v result:%X log:%v",
 					res.Code, res.Data, res.Log)
@@ -79,8 +79,8 @@ func TestSerialReap(t *testing.T) {
 
 	//----------------------------------------
 
-	// Append some txs.
-	appendTxsRange(0, 100)
+	// Deliver some txs.
+	deliverTxsRange(0, 100)
 
 	// Reap the txs.
 	reapCheck(100)
@@ -88,9 +88,9 @@ func TestSerialReap(t *testing.T) {
 	// Reap again.  We should get the same amount
 	reapCheck(100)
 
-	// Append 0 to 999, we should reap 900 new txs
+	// Deliver 0 to 999, we should reap 900 new txs
 	// because 100 were already counted.
-	appendTxsRange(0, 1000)
+	deliverTxsRange(0, 1000)
 
 	// Reap the txs.
 	reapCheck(1000)
@@ -105,8 +105,8 @@ func TestSerialReap(t *testing.T) {
 	// We should have 500 left.
 	reapCheck(500)
 
-	// Append 100 invalid txs and 100 valid txs
-	appendTxsRange(900, 1100)
+	// Deliver 100 invalid txs and 100 valid txs
+	deliverTxsRange(900, 1100)
 
 	// We should have 600 now.
 	reapCheck(600)
diff --git a/proxy/app_conn.go b/proxy/app_conn.go
index f6462faaf..6abb8c7eb 100644
--- a/proxy/app_conn.go
+++ b/proxy/app_conn.go
@@ -15,7 +15,7 @@ type AppConnConsensus interface {
 	InitChainSync(validators []*types.Validator) (err error)
 
 	BeginBlockSync(hash []byte, header *types.Header) (err error)
-	AppendTxAsync(tx []byte) *abcicli.ReqRes
+	DeliverTxAsync(tx []byte) *abcicli.ReqRes
 	EndBlockSync(height uint64) (types.ResponseEndBlock, error)
 	CommitSync() (res types.Result)
 }
@@ -69,8 +69,8 @@ func (app *appConnConsensus) BeginBlockSync(hash []byte, header *types.Header) (
 	return app.appConn.BeginBlockSync(hash, header)
 }
 
-func (app *appConnConsensus) AppendTxAsync(tx []byte) *abcicli.ReqRes {
-	return app.appConn.AppendTxAsync(tx)
+func (app *appConnConsensus) DeliverTxAsync(tx []byte) *abcicli.ReqRes {
+	return app.appConn.DeliverTxAsync(tx)
 }
 
 func (app *appConnConsensus) EndBlockSync(height uint64) (types.ResponseEndBlock, error) {
diff --git a/rpc/core/mempool.go b/rpc/core/mempool.go
index b1eaa9792..eefc226ad 100644
--- a/rpc/core/mempool.go
+++ b/rpc/core/mempool.go
@@ -41,14 +41,14 @@ func BroadcastTxSync(tx types.Tx) (*ctypes.ResultBroadcastTx, error) {
 
 // CONTRACT: only returns error if mempool.BroadcastTx errs (ie. problem with the app)
 // or if we timeout waiting for tx to commit.
-// If CheckTx or AppendTx fail, no error will be returned, but the returned result
+// If CheckTx or DeliverTx fail, no error will be returned, but the returned result
 // will contain a non-OK ABCI code.
 func BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error) {
 
 	// subscribe to tx being committed in block
-	appendTxResCh := make(chan types.EventDataTx, 1)
+	deliverTxResCh := make(chan types.EventDataTx, 1)
 	types.AddListenerForEvent(eventSwitch, "rpc", types.EventStringTx(tx), func(data types.TMEventData) {
-		appendTxResCh <- data.(types.EventDataTx)
+		deliverTxResCh <- data.(types.EventDataTx)
 	})
 
 	// broadcast the tx and register checktx callback
@@ -66,7 +66,7 @@ func BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error) {
 		// CheckTx failed!
 		return &ctypes.ResultBroadcastTxCommit{
 			CheckTx:  checkTxR,
-			AppendTx: nil,
+			DeliverTx: nil,
 		}, nil
 	}
 
@@ -75,23 +75,23 @@ func BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error) {
 	// TODO: configureable?
 	timer := time.NewTimer(60 * 2 * time.Second)
 	select {
-	case appendTxRes := <-appendTxResCh:
+	case deliverTxRes := <-deliverTxResCh:
 		// The tx was included in a block.
-		appendTxR := &abci.ResponseAppendTx{
-			Code: appendTxRes.Code,
-			Data: appendTxRes.Data,
-			Log:  appendTxRes.Log,
+		deliverTxR := &abci.ResponseDeliverTx{
+			Code: deliverTxRes.Code,
+			Data: deliverTxRes.Data,
+			Log:  deliverTxRes.Log,
 		}
-		log.Notice("AppendTx passed ", "tx", []byte(tx), "response", appendTxR)
+		log.Notice("DeliverTx passed ", "tx", []byte(tx), "response", deliverTxR)
 		return &ctypes.ResultBroadcastTxCommit{
 			CheckTx:  checkTxR,
-			AppendTx: appendTxR,
+			DeliverTx: deliverTxR,
 		}, nil
 	case <-timer.C:
 		log.Error("failed to include tx")
 		return &ctypes.ResultBroadcastTxCommit{
 			CheckTx:  checkTxR,
-			AppendTx: nil,
+			DeliverTx: nil,
 		}, fmt.Errorf("Timed out waiting for transaction to be included in a block")
 	}
 
diff --git a/rpc/core/types/responses.go b/rpc/core/types/responses.go
index ff72fa65c..5915c1db6 100644
--- a/rpc/core/types/responses.go
+++ b/rpc/core/types/responses.go
@@ -65,7 +65,7 @@ type ResultBroadcastTx struct {
 
 type ResultBroadcastTxCommit struct {
 	CheckTx  *abci.ResponseCheckTx  `json:"check_tx"`
-	AppendTx *abci.ResponseAppendTx `json:"append_tx"`
+	DeliverTx *abci.ResponseDeliverTx `json:"deliver_tx"`
 }
 
 type ResultUnconfirmedTxs struct {
diff --git a/rpc/grpc/api.go b/rpc/grpc/api.go
index c8b8dce75..fab811c2e 100644
--- a/rpc/grpc/api.go
+++ b/rpc/grpc/api.go
@@ -14,5 +14,5 @@ func (bapi *broadcastAPI) BroadcastTx(ctx context.Context, req *RequestBroadcast
 	if err != nil {
 		return nil, err
 	}
-	return &ResponseBroadcastTx{res.CheckTx, res.AppendTx}, nil
+	return &ResponseBroadcastTx{res.CheckTx, res.DeliverTx}, nil
 }
diff --git a/rpc/grpc/types.pb.go b/rpc/grpc/types.pb.go
index c0c642427..d373f0971 100644
--- a/rpc/grpc/types.pb.go
+++ b/rpc/grpc/types.pb.go
@@ -53,7 +53,7 @@ func (m *RequestBroadcastTx) GetTx() []byte {
 
 type ResponseBroadcastTx struct {
 	CheckTx  *types.ResponseCheckTx  `protobuf:"bytes,1,opt,name=check_tx,json=checkTx" json:"check_tx,omitempty"`
-	AppendTx *types.ResponseAppendTx `protobuf:"bytes,2,opt,name=append_tx,json=appendTx" json:"append_tx,omitempty"`
+	DeliverTx *types.ResponseDeliverTx `protobuf:"bytes,2,opt,name=deliver_tx,json=deliverTx" json:"deliver_tx,omitempty"`
 }
 
 func (m *ResponseBroadcastTx) Reset()                    { *m = ResponseBroadcastTx{} }
@@ -68,9 +68,9 @@ func (m *ResponseBroadcastTx) GetCheckTx() *types.ResponseCheckTx {
 	return nil
 }
 
-func (m *ResponseBroadcastTx) GetAppendTx() *types.ResponseAppendTx {
+func (m *ResponseBroadcastTx) GetDeliverTx() *types.ResponseDeliverTx {
 	if m != nil {
-		return m.AppendTx
+		return m.DeliverTx
 	}
 	return nil
 }
diff --git a/rpc/grpc/types.proto b/rpc/grpc/types.proto
index 507e17ef9..3090e3d06 100644
--- a/rpc/grpc/types.proto
+++ b/rpc/grpc/types.proto
@@ -18,7 +18,7 @@ message RequestBroadcastTx {
 
 message ResponseBroadcastTx{
 	types.ResponseCheckTx check_tx = 1;
-	types.ResponseAppendTx append_tx = 2;
+	types.ResponseDeliverTx deliver_tx = 2;
 }
 
 //----------------------------------------
diff --git a/rpc/test/client_test.go b/rpc/test/client_test.go
index 3b8dfd28e..da0b86f36 100644
--- a/rpc/test/client_test.go
+++ b/rpc/test/client_test.go
@@ -198,9 +198,9 @@ func testBroadcastTxCommit(t *testing.T, resI interface{}, tx []byte) {
 	if checkTx.Code != abci.CodeType_OK {
 		panic(Fmt("BroadcastTxCommit got non-zero exit code from CheckTx: %v. %X; %s", checkTx.Code, checkTx.Data, checkTx.Log))
 	}
-	appendTx := res.AppendTx
-	if appendTx.Code != abci.CodeType_OK {
-		panic(Fmt("BroadcastTxCommit got non-zero exit code from CheckTx: %v. %X; %s", appendTx.Code, appendTx.Data, appendTx.Log))
+	deliverTx := res.DeliverTx
+	if deliverTx.Code != abci.CodeType_OK {
+		panic(Fmt("BroadcastTxCommit got non-zero exit code from CheckTx: %v. %X; %s", deliverTx.Code, deliverTx.Data, deliverTx.Log))
 	}
 	mem := node.MempoolReactor().Mempool
 	if mem.Size() != 0 {
diff --git a/rpc/test/grpc_test.go b/rpc/test/grpc_test.go
index 13672773c..73ba22a78 100644
--- a/rpc/test/grpc_test.go
+++ b/rpc/test/grpc_test.go
@@ -18,7 +18,7 @@ func TestBroadcastTx(t *testing.T) {
 	if res.CheckTx.Code != 0 {
 		t.Fatalf("Non-zero check tx code: %d", res.CheckTx.Code)
 	}
-	if res.AppendTx.Code != 0 {
-		t.Fatalf("Non-zero append tx code: %d", res.AppendTx.Code)
+	if res.DeliverTx.Code != 0 {
+		t.Fatalf("Non-zero append tx code: %d", res.DeliverTx.Code)
 	}
 }
diff --git a/state/execution.go b/state/execution.go
index 924d76be4..a7ba2399e 100644
--- a/state/execution.go
+++ b/state/execution.go
@@ -73,24 +73,24 @@ func execBlockOnProxyApp(eventCache types.Fireable, proxyAppConn proxy.AppConnCo
 	// Execute transactions and get hash
 	proxyCb := func(req *abci.Request, res *abci.Response) {
 		switch r := res.Value.(type) {
-		case *abci.Response_AppendTx:
+		case *abci.Response_DeliverTx:
 			// TODO: make use of res.Log
 			// TODO: make use of this info
 			// Blocks may include invalid txs.
-			// reqAppendTx := req.(abci.RequestAppendTx)
+			// reqDeliverTx := req.(abci.RequestDeliverTx)
 			txError := ""
-			apTx := r.AppendTx
+			apTx := r.DeliverTx
 			if apTx.Code == abci.CodeType_OK {
 				validTxs += 1
 			} else {
-				log.Debug("Invalid tx", "code", r.AppendTx.Code, "log", r.AppendTx.Log)
+				log.Debug("Invalid tx", "code", r.DeliverTx.Code, "log", r.DeliverTx.Log)
 				invalidTxs += 1
 				txError = apTx.Code.String()
 			}
 			// NOTE: if we count we can access the tx from the block instead of
 			// pulling it from the req
 			event := types.EventDataTx{
-				Tx:    req.GetAppendTx().Tx,
+				Tx:    req.GetDeliverTx().Tx,
 				Data:  apTx.Data,
 				Code:  apTx.Code,
 				Log:   apTx.Log,
@@ -113,7 +113,7 @@ func execBlockOnProxyApp(eventCache types.Fireable, proxyAppConn proxy.AppConnCo
 	// Run txs of block
 	for _, tx := range block.Txs {
 		fail.FailRand(len(block.Txs)) // XXX
-		proxyAppConn.AppendTxAsync(tx)
+		proxyAppConn.DeliverTxAsync(tx)
 		if err := proxyAppConn.Error(); err != nil {
 			return nil, err
 		}
diff --git a/test/app/counter_test.sh b/test/app/counter_test.sh
index 37f65b90e..c0ae57245 100644
--- a/test/app/counter_test.sh
+++ b/test/app/counter_test.sh
@@ -50,7 +50,7 @@ function sendTx() {
 	if [[ "$IS_JSON" != "0" ]]; then
 		ERROR="$RESPONSE"
 	fi
-	APPEND_TX_RESPONSE=`echo $RESPONSE | jq .append_tx`
+	APPEND_TX_RESPONSE=`echo $RESPONSE | jq .deliver_tx`
 	APPEND_TX_CODE=`getCode "$APPEND_TX_RESPONSE"`
 	CHECK_TX_RESPONSE=`echo $RESPONSE | jq .check_tx`
 	CHECK_TX_CODE=`getCode "$CHECK_TX_RESPONSE"`