diff --git a/blockchain/reactor.go b/blockchain/reactor.go
index bfa671d0..4a7f21d0 100644
--- a/blockchain/reactor.go
+++ b/blockchain/reactor.go
@@ -242,7 +242,7 @@ FOR_LOOP:
 					// NOTE: we could improve performance if we
 					// didn't make the app commit to disk every block
 					// ... but we would need a way to get the hash without it persisting
-					err := bcR.state.ApplyBlock(bcR.evsw, bcR.proxyAppConn, first, firstPartsHeader, sm.MockMempool{})
+					err := bcR.state.ApplyBlock(bcR.evsw, bcR.proxyAppConn, first, firstPartsHeader, types.MockMempool{})
 					if err != nil {
 						// TODO This is bad, are we zombie?
 						PanicQ(Fmt("Failed to process committed block (%d:%X): %v", first.Height, first.Hash(), err))
diff --git a/consensus/replay.go b/consensus/replay.go
index 2ab84dc2..07308bf1 100644
--- a/consensus/replay.go
+++ b/consensus/replay.go
@@ -175,8 +175,8 @@ func makeHeightSearchFunc(height int) auto.SearchFunc {
 // we were last and using the WAL to recover there
 
 // Replay the last block through the consensus and return the AppHash from after Commit.
-func replayLastBlock(config cfg.Config, state *sm.State, proxyApp proxy.AppConnConsensus, blockStore sm.BlockStore) ([]byte, error) {
-	mempool := sm.MockMempool{}
+func replayLastBlock(config cfg.Config, state *sm.State, proxyApp proxy.AppConnConsensus, blockStore types.BlockStore) ([]byte, error) {
+	mempool := types.MockMempool{}
 	cs := NewConsensusState(config, state, proxyApp, blockStore, mempool)
 
 	evsw := types.NewEventSwitch()
@@ -196,12 +196,12 @@ func replayLastBlock(config cfg.Config, state *sm.State, proxyApp proxy.AppConnC
 type Handshaker struct {
 	config cfg.Config
 	state  *sm.State
-	store  sm.BlockStore
+	store  types.BlockStore
 
 	nBlocks int // number of blocks applied to the state
 }
 
-func NewHandshaker(config cfg.Config, state *sm.State, store sm.BlockStore) *Handshaker {
+func NewHandshaker(config cfg.Config, state *sm.State, store types.BlockStore) *Handshaker {
 	return &Handshaker{config, state, store, 0}
 }
 
diff --git a/consensus/replay_test.go b/consensus/replay_test.go
index 3016f104..2d812de9 100644
--- a/consensus/replay_test.go
+++ b/consensus/replay_test.go
@@ -254,7 +254,7 @@ func testReplayCrashBeforeWriteVote(t *testing.T, thisCase *testCase, lineNum in
 
 var (
 	NUM_BLOCKS = 6 // number of blocks in the test_data/many_blocks.cswal
-	mempool    = sm.MockMempool{}
+	mempool    = types.MockMempool{}
 
 	testPartSize int
 )
diff --git a/consensus/state.go b/consensus/state.go
index dc1324e3..882d5c87 100644
--- a/consensus/state.go
+++ b/consensus/state.go
@@ -224,8 +224,8 @@ type ConsensusState struct {
 
 	config       cfg.Config
 	proxyAppConn proxy.AppConnConsensus
-	blockStore   sm.BlockStore
-	mempool      sm.Mempool
+	blockStore   types.BlockStore
+	mempool      types.Mempool
 
 	privValidator PrivValidator // for signing votes
 
@@ -253,7 +253,7 @@ type ConsensusState struct {
 	done chan struct{}
 }
 
-func NewConsensusState(config cfg.Config, state *sm.State, proxyAppConn proxy.AppConnConsensus, blockStore sm.BlockStore, mempool sm.Mempool) *ConsensusState {
+func NewConsensusState(config cfg.Config, state *sm.State, proxyAppConn proxy.AppConnConsensus, blockStore types.BlockStore, mempool types.Mempool) *ConsensusState {
 	cs := &ConsensusState{
 		config:           config,
 		proxyAppConn:     proxyAppConn,
diff --git a/rpc/core/pipe.go b/rpc/core/pipe.go
index fb06c3ff..40ef7081 100644
--- a/rpc/core/pipe.go
+++ b/rpc/core/pipe.go
@@ -5,36 +5,19 @@ import (
 	"github.com/tendermint/go-crypto"
 	"github.com/tendermint/go-p2p"
 
-	abci "github.com/tendermint/abci/types"
 	"github.com/tendermint/tendermint/consensus"
 	"github.com/tendermint/tendermint/proxy"
 	"github.com/tendermint/tendermint/types"
 )
 
-//-----------------------------------------------------
-// Interfaces for use by RPC
-// NOTE: these methods must be thread safe!
-
-type BlockStore interface {
-	Height() int
-	LoadBlockMeta(height int) *types.BlockMeta
-	LoadBlock(height int) *types.Block
-	LoadSeenCommit(height int) *types.Commit
-	LoadBlockCommit(height int) *types.Commit
-}
+//----------------------------------------------
+// These interfaces are used by RPC and must be thread safe
 
 type Consensus interface {
 	GetValidators() (int, []*types.Validator)
 	GetRoundState() *consensus.RoundState
 }
 
-type Mempool interface {
-	Size() int
-	CheckTx(types.Tx, func(*abci.Response)) error
-	Reap(int) types.Txs
-	Flush()
-}
-
 type P2P interface {
 	Listeners() []p2p.Listener
 	Peers() p2p.IPeerSet
@@ -44,16 +27,18 @@ type P2P interface {
 	DialSeeds([]string)
 }
 
+//----------------------------------------------
+
 var (
 	// external, thread safe interfaces
 	eventSwitch   types.EventSwitch
 	proxyAppQuery proxy.AppConnQuery
 	config        cfg.Config
 
-	// interfaces defined above
-	blockStore     BlockStore
+	// interfaces defined in types and above
+	blockStore     types.BlockStore
+	mempool        types.Mempool
 	consensusState Consensus
-	mempool        Mempool
 	p2pSwitch      P2P
 
 	// objects
@@ -69,18 +54,18 @@ func SetEventSwitch(evsw types.EventSwitch) {
 	eventSwitch = evsw
 }
 
-func SetBlockStore(bs BlockStore) {
+func SetBlockStore(bs types.BlockStore) {
 	blockStore = bs
 }
 
+func SetMempool(mem types.Mempool) {
+	mempool = mem
+}
+
 func SetConsensusState(cs Consensus) {
 	consensusState = cs
 }
 
-func SetMempool(mem Mempool) {
-	mempool = mem
-}
-
 func SetSwitch(sw P2P) {
 	p2pSwitch = sw
 }
diff --git a/state/execution.go b/state/execution.go
index 3e7ad91b..aa911301 100644
--- a/state/execution.go
+++ b/state/execution.go
@@ -223,7 +223,7 @@ func (s *State) validateBlock(block *types.Block) error {
 
 // Execute and commit block against app, save block and state
 func (s *State) ApplyBlock(eventCache types.Fireable, proxyAppConn proxy.AppConnConsensus,
-	block *types.Block, partsHeader types.PartSetHeader, mempool Mempool) error {
+	block *types.Block, partsHeader types.PartSetHeader, mempool types.Mempool) error {
 
 	// Run the block on the State:
 	// + update validator sets
@@ -244,7 +244,7 @@ func (s *State) ApplyBlock(eventCache types.Fireable, proxyAppConn proxy.AppConn
 // mempool must be locked during commit and update
 // because state is typically reset on Commit and old txs must be replayed
 // against committed state before new txs are run in the mempool, lest they be invalid
-func (s *State) CommitStateUpdateMempool(proxyAppConn proxy.AppConnConsensus, block *types.Block, mempool Mempool) error {
+func (s *State) CommitStateUpdateMempool(proxyAppConn proxy.AppConnConsensus, block *types.Block, mempool types.Mempool) error {
 	mempool.Lock()
 	defer mempool.Unlock()
 
@@ -288,40 +288,3 @@ func ApplyBlock(appConnConsensus proxy.AppConnConsensus, block *types.Block) ([]
 	}
 	return res.Data, nil
 }
-
-//------------------------------------------------------
-// blockchain services types
-
-// 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(types.Tx, func(*abci.Response)) error
-	Reap(int) types.Txs
-	Update(height int, txs types.Txs)
-}
-
-type MockMempool struct {
-}
-
-func (m MockMempool) Lock()                                              {}
-func (m MockMempool) Unlock()                                            {}
-func (m MockMempool) CheckTx(tx types.Tx, cb func(*abci.Response)) error { return nil }
-func (m MockMempool) Reap(n int) types.Txs                               { return types.Txs{} }
-func (m MockMempool) Update(height int, txs types.Txs)                   {}
-
-// TODO: Should we move blockchain/store.go to its own package?
-type BlockStore interface {
-	Height() int
-
-	LoadBlockMeta(height int) *types.BlockMeta
-	LoadBlock(height int) *types.Block
-	LoadBlockPart(height int, index int) *types.Part
-
-	SaveBlock(block *types.Block, blockParts *types.PartSet, seenCommit *types.Commit)
-
-	LoadBlockCommit(height int) *types.Commit
-	LoadSeenCommit(height int) *types.Commit
-}
diff --git a/types/services.go b/types/services.go
new file mode 100644
index 00000000..ee20487e
--- /dev/null
+++ b/types/services.go
@@ -0,0 +1,56 @@
+package types
+
+import (
+	abci "github.com/tendermint/abci/types"
+)
+
+//------------------------------------------------------
+// blockchain services types
+// NOTE: Interfaces used by RPC must be thread safe!
+//------------------------------------------------------
+
+//------------------------------------------------------
+// mempool
+
+// 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()
+
+	Size() int
+	CheckTx(Tx, func(*abci.Response)) error
+	Reap(int) Txs
+	Update(height int, txs Txs)
+	Flush()
+}
+
+type MockMempool struct {
+}
+
+func (m MockMempool) Lock()                                        {}
+func (m MockMempool) Unlock()                                      {}
+func (m MockMempool) Size() int                                    { return 0 }
+func (m MockMempool) CheckTx(tx Tx, cb func(*abci.Response)) error { return nil }
+func (m MockMempool) Reap(n int) Txs                               { return Txs{} }
+func (m MockMempool) Update(height int, txs Txs)                   {}
+func (m MockMempool) Flush()                                       {}
+
+//------------------------------------------------------
+// blockstore
+
+type BlockStoreRPC interface {
+	Height() int
+
+	LoadBlockMeta(height int) *BlockMeta
+	LoadBlock(height int) *Block
+	LoadBlockPart(height int, index int) *Part
+
+	LoadBlockCommit(height int) *Commit
+	LoadSeenCommit(height int) *Commit
+}
+
+type BlockStore interface {
+	BlockStoreRPC
+	SaveBlock(block *Block, blockParts *PartSet, seenCommit *Commit)
+}