diff --git a/api/api_full.go b/api/api_full.go
index a84d393ad50..7aea4c4433b 100644
--- a/api/api_full.go
+++ b/api/api_full.go
@@ -331,10 +331,14 @@ type FullNode interface {
 
 	// MethodGroup: State
 	// The State methods are used to query, inspect, and interact with chain state.
-	// Most methods take a TipSetKey as a parameter. The state looked up is the state at that tipset.
+	// Most methods take a TipSetKey as a parameter. The state looked up is the parent state of the tipset.
 	// A nil TipSetKey can be provided as a param, this will cause the heaviest tipset in the chain to be used.
 
 	// StateCall runs the given message and returns its result without any persisted changes.
+	//
+	// StateCall applies the message to the tipset's parent state. The
+	// message is not applied on-top-of the messages in the passed-in
+	// tipset.
 	StateCall(context.Context, *types.Message, types.TipSetKey) (*InvocResult, error)
 	// StateReplay replays a given message, assuming it was included in a block in the specified tipset.
 	// If no tipset key is provided, the appropriate tipset is looked up.
diff --git a/build/version.go b/build/version.go
index fe9fc07c586..a53da927447 100644
--- a/build/version.go
+++ b/build/version.go
@@ -89,7 +89,7 @@ func VersionForType(nodeType NodeType) (Version, error) {
 
 // semver versions of the rpc api exposed
 var (
-	FullAPIVersion   = newVer(1, 0, 0)
+	FullAPIVersion   = newVer(1, 1, 0)
 	MinerAPIVersion  = newVer(1, 0, 1)
 	WorkerAPIVersion = newVer(1, 0, 0)
 )
diff --git a/chain/stmgr/utils.go b/chain/stmgr/utils.go
index 1d59b263007..86bb3a6e093 100644
--- a/chain/stmgr/utils.go
+++ b/chain/stmgr/utils.go
@@ -145,20 +145,6 @@ func MinerSectorInfo(ctx context.Context, sm *StateManager, maddr address.Addres
 	return mas.GetSector(sid)
 }
 
-func GetMinerSectorSet(ctx context.Context, sm *StateManager, ts *types.TipSet, maddr address.Address, snos *bitfield.BitField) ([]*miner.SectorOnChainInfo, error) {
-	act, err := sm.LoadActor(ctx, maddr, ts)
-	if err != nil {
-		return nil, xerrors.Errorf("(get sset) failed to load miner actor: %w", err)
-	}
-
-	mas, err := miner.Load(sm.cs.Store(ctx), act)
-	if err != nil {
-		return nil, xerrors.Errorf("(get sset) failed to load miner actor state: %w", err)
-	}
-
-	return mas.LoadSectors(snos)
-}
-
 func GetSectorsForWinningPoSt(ctx context.Context, nv network.Version, pv ffiwrapper.Verifier, sm *StateManager, st cid.Cid, maddr address.Address, rand abi.PoStRandomness) ([]builtin.SectorInfo, error) {
 	act, err := sm.LoadActorRaw(ctx, maddr, st)
 	if err != nil {
diff --git a/chain/sync_test.go b/chain/sync_test.go
index 559a73bf525..9570eda328f 100644
--- a/chain/sync_test.go
+++ b/chain/sync_test.go
@@ -573,11 +573,14 @@ func TestDuplicateNonce(t *testing.T) {
 
 	base := tu.g.CurTipset
 
+	// Get the banker from computed tipset state, not the parent.
+	st, _, err := tu.g.StateManager().TipSetState(context.TODO(), base.TipSet())
+	require.NoError(t, err)
+	ba, err := tu.g.StateManager().LoadActorRaw(context.TODO(), tu.g.Banker(), st)
+	require.NoError(t, err)
+
 	// Produce a message from the banker to the rcvr
 	makeMsg := func(rcvr address.Address) *types.SignedMessage {
-
-		ba, err := tu.nds[0].StateGetActor(context.TODO(), tu.g.Banker(), base.TipSet().Key())
-		require.NoError(t, err)
 		msg := types.Message{
 			To:   rcvr,
 			From: tu.g.Banker(),
diff --git a/documentation/en/api-methods-miner.md b/documentation/en/api-methods-miner.md
index 66512a02c73..19c85385028 100644
--- a/documentation/en/api-methods-miner.md
+++ b/documentation/en/api-methods-miner.md
@@ -168,7 +168,7 @@ Response:
 ```json
 {
   "Version": "string value",
-  "APIVersion": 65536,
+  "APIVersion": 65792,
   "BlockDelay": 42
 }
 ```
diff --git a/documentation/en/api-methods-worker.md b/documentation/en/api-methods-worker.md
index 2224a73f9ae..f86fa52e07d 100644
--- a/documentation/en/api-methods-worker.md
+++ b/documentation/en/api-methods-worker.md
@@ -146,7 +146,7 @@ Perms: admin
 
 Inputs: `null`
 
-Response: `65536`
+Response: `65792`
 
 ## Add
 
diff --git a/documentation/en/api-methods.md b/documentation/en/api-methods.md
index 839c3271b4c..a35481135ae 100644
--- a/documentation/en/api-methods.md
+++ b/documentation/en/api-methods.md
@@ -254,7 +254,7 @@ Response:
 ```json
 {
   "Version": "string value",
-  "APIVersion": 65536,
+  "APIVersion": 65792,
   "BlockDelay": 42
 }
 ```
@@ -3309,7 +3309,7 @@ Response:
 
 ## State
 The State methods are used to query, inspect, and interact with chain state.
-Most methods take a TipSetKey as a parameter. The state looked up is the state at that tipset.
+Most methods take a TipSetKey as a parameter. The state looked up is the parent state of the tipset.
 A nil TipSetKey can be provided as a param, this will cause the heaviest tipset in the chain to be used.
 
 
@@ -3362,6 +3362,10 @@ Response: `null`
 ### StateCall
 StateCall runs the given message and returns its result without any persisted changes.
 
+StateCall applies the message to the tipset's parent state. The
+message is not applied on-top-of the messages in the passed-in
+tipset.
+
 
 Perms: read
 
diff --git a/miner/miner.go b/miner/miner.go
index 4075c8cc6f0..efdbe489652 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -21,7 +21,6 @@ import (
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/build"
 	"github.com/filecoin-project/lotus/chain/gen"
-	"github.com/filecoin-project/lotus/chain/messagepool/gasguess"
 	"github.com/filecoin-project/lotus/chain/store"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/journal"
@@ -506,33 +505,3 @@ func (m *Miner) createBlock(base *MiningBase, addr address.Address, ticket *type
 		WinningPoStProof: wpostProof,
 	})
 }
-
-type actCacheEntry struct {
-	act *types.Actor
-	err error
-}
-
-type cachedActorLookup struct {
-	tsk      types.TipSetKey
-	cache    map[address.Address]actCacheEntry
-	fallback gasguess.ActorLookup
-}
-
-func (c *cachedActorLookup) StateGetActor(ctx context.Context, a address.Address, tsk types.TipSetKey) (*types.Actor, error) {
-	if c.tsk == tsk {
-		e, has := c.cache[a]
-		if has {
-			return e.act, e.err
-		}
-	}
-
-	e, err := c.fallback(ctx, a, tsk)
-	if c.tsk == tsk {
-		c.cache[a] = actCacheEntry{
-			act: e, err: err,
-		}
-	}
-	return e, err
-}
-
-type ActorLookup func(context.Context, address.Address, types.TipSetKey) (*types.Actor, error)
diff --git a/node/impl/full/state.go b/node/impl/full/state.go
index 4377571aec3..04105b22575 100644
--- a/node/impl/full/state.go
+++ b/node/impl/full/state.go
@@ -6,7 +6,6 @@ import (
 	"strconv"
 
 	cid "github.com/ipfs/go-cid"
-	cbor "github.com/ipfs/go-ipld-cbor"
 	"go.uber.org/fx"
 	"golang.org/x/xerrors"
 
@@ -35,7 +34,6 @@ import (
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/chain/vm"
 	"github.com/filecoin-project/lotus/chain/wallet"
-	"github.com/filecoin-project/lotus/lib/bufbstore"
 	"github.com/filecoin-project/lotus/node/modules/dtypes"
 )
 
@@ -94,19 +92,20 @@ func (a *StateAPI) StateNetworkName(ctx context.Context) (dtypes.NetworkName, er
 }
 
 func (a *StateAPI) StateMinerSectors(ctx context.Context, addr address.Address, sectorNos *bitfield.BitField, tsk types.TipSetKey) ([]*miner.SectorOnChainInfo, error) {
-	ts, err := a.Chain.GetTipSetFromKey(tsk)
+	act, err := a.StateManager.LoadActorTsk(ctx, addr, tsk)
 	if err != nil {
-		return nil, xerrors.Errorf("loading tipset %s: %w", tsk, err)
+		return nil, xerrors.Errorf("failed to load miner actor: %w", err)
 	}
-	return stmgr.GetMinerSectorSet(ctx, a.StateManager, ts, addr, sectorNos)
-}
 
-func (a *StateAPI) StateMinerActiveSectors(ctx context.Context, maddr address.Address, tsk types.TipSetKey) ([]*miner.SectorOnChainInfo, error) { // TODO: only used in cli
-	ts, err := a.Chain.GetTipSetFromKey(tsk)
+	mas, err := miner.Load(a.StateManager.ChainStore().Store(ctx), act)
 	if err != nil {
-		return nil, xerrors.Errorf("loading tipset %s: %w", tsk, err)
+		return nil, xerrors.Errorf("failed to load miner actor state: %w", err)
 	}
 
+	return mas.LoadSectors(sectorNos)
+}
+
+func (a *StateAPI) StateMinerActiveSectors(ctx context.Context, maddr address.Address, tsk types.TipSetKey) ([]*miner.SectorOnChainInfo, error) { // TODO: only used in cli
 	act, err := a.StateManager.LoadActorTsk(ctx, maddr, tsk)
 	if err != nil {
 		return nil, xerrors.Errorf("failed to load miner actor: %w", err)
@@ -122,7 +121,7 @@ func (a *StateAPI) StateMinerActiveSectors(ctx context.Context, maddr address.Ad
 		return nil, xerrors.Errorf("merge partition active sets: %w", err)
 	}
 
-	return stmgr.GetMinerSectorSet(ctx, a.StateManager, ts, maddr, &activeSectors)
+	return mas.LoadSectors(&activeSectors)
 }
 
 func (m *StateModule) StateMinerInfo(ctx context.Context, actor address.Address, tsk types.TipSetKey) (miner.MinerInfo, error) {
@@ -426,38 +425,12 @@ func (a *StateAPI) StateReplay(ctx context.Context, tsk types.TipSetKey, mc cid.
 	}, nil
 }
 
-func stateForTs(ctx context.Context, ts *types.TipSet, cstore *store.ChainStore, smgr *stmgr.StateManager) (*state.StateTree, error) {
-	if ts == nil {
-		ts = cstore.GetHeaviestTipSet()
-	}
-
-	st, _, err := smgr.TipSetState(ctx, ts)
-	if err != nil {
-		return nil, err
-	}
-
-	buf := bufbstore.NewBufferedBstore(cstore.Blockstore())
-	cst := cbor.NewCborStore(buf)
-	return state.LoadStateTree(cst, st)
-}
-func (a *StateAPI) stateForTs(ctx context.Context, ts *types.TipSet) (*state.StateTree, error) {
-	return stateForTs(ctx, ts, a.Chain, a.StateManager)
-}
-func (m *StateModule) stateForTs(ctx context.Context, ts *types.TipSet) (*state.StateTree, error) {
-	return stateForTs(ctx, ts, m.Chain, m.StateManager)
-}
-
 func (m *StateModule) StateGetActor(ctx context.Context, actor address.Address, tsk types.TipSetKey) (*types.Actor, error) {
 	ts, err := m.Chain.GetTipSetFromKey(tsk)
 	if err != nil {
 		return nil, xerrors.Errorf("loading tipset %s: %w", tsk, err)
 	}
-	state, err := m.stateForTs(ctx, ts)
-	if err != nil {
-		return nil, xerrors.Errorf("computing tipset state failed: %w", err)
-	}
-
-	return state.GetActor(actor)
+	return m.StateManager.LoadActor(ctx, actor, ts)
 }
 
 func (m *StateModule) StateLookupID(ctx context.Context, addr address.Address, tsk types.TipSetKey) (address.Address, error) {
@@ -483,17 +456,12 @@ func (a *StateAPI) StateReadState(ctx context.Context, actor address.Address, ts
 	if err != nil {
 		return nil, xerrors.Errorf("loading tipset %s: %w", tsk, err)
 	}
-	state, err := a.stateForTs(ctx, ts)
-	if err != nil {
-		return nil, xerrors.Errorf("getting state for tipset: %w", err)
-	}
-
-	act, err := state.GetActor(actor)
+	act, err := a.StateManager.LoadActor(ctx, actor, ts)
 	if err != nil {
 		return nil, xerrors.Errorf("getting actor: %w", err)
 	}
 
-	blk, err := state.Store.(*cbor.BasicIpldStore).Blocks.Get(act.Head)
+	blk, err := a.Chain.Blockstore().Get(act.Head)
 	if err != nil {
 		return nil, xerrors.Errorf("getting actor head: %w", err)
 	}
@@ -529,6 +497,7 @@ func (a *StateAPI) StateDecodeParams(ctx context.Context, toAddr address.Address
 
 // This is on StateAPI because miner.Miner requires this, and MinerAPI requires miner.Miner
 func (a *StateAPI) MinerGetBaseInfo(ctx context.Context, maddr address.Address, epoch abi.ChainEpoch, tsk types.TipSetKey) (*api.MiningBaseInfo, error) {
+	// XXX: Gets the state by computing the tipset state, instead of looking at the parent.
 	return stmgr.MinerGetBaseInfo(ctx, a.StateManager, a.Beacon, tsk, epoch, maddr, a.ProofVerifier)
 }
 
@@ -1372,11 +1341,11 @@ func (a *StateAPI) StateCirculatingSupply(ctx context.Context, tsk types.TipSetK
 		return types.EmptyInt, xerrors.Errorf("loading tipset %s: %w", tsk, err)
 	}
 
-	sTree, err := a.stateForTs(ctx, ts)
+	sTree, err := a.StateManager.ParentState(ts)
 	if err != nil {
 		return types.EmptyInt, err
 	}
-	return a.StateManager.GetCirculatingSupply(ctx, ts.Height(), sTree)
+	return a.StateManager.GetCirculatingSupply(ctx, ts.Height()-1, sTree)
 }
 
 func (a *StateAPI) StateVMCirculatingSupplyInternal(ctx context.Context, tsk types.TipSetKey) (api.CirculatingSupply, error) {
@@ -1393,7 +1362,7 @@ func stateVMCirculatingSupplyInternal(
 		return api.CirculatingSupply{}, xerrors.Errorf("loading tipset %s: %w", tsk, err)
 	}
 
-	sTree, err := stateForTs(ctx, ts, cstore, smgr)
+	sTree, err := smgr.ParentState(ts)
 	if err != nil {
 		return api.CirculatingSupply{}, err
 	}
@@ -1407,5 +1376,7 @@ func (m *StateModule) StateNetworkVersion(ctx context.Context, tsk types.TipSetK
 		return network.VersionMax, xerrors.Errorf("loading tipset %s: %w", tsk, err)
 	}
 
+	// TODO: Height-1 to be consistent with the rest of the APIs?
+	// But that's likely going to break a bunch of stuff.
 	return m.StateManager.GetNtwkVersion(ctx, ts.Height()), nil
 }
diff --git a/node/modules/mpoolnonceapi.go b/node/modules/mpoolnonceapi.go
index 294f4d95478..efcb14037db 100644
--- a/node/modules/mpoolnonceapi.go
+++ b/node/modules/mpoolnonceapi.go
@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"go.uber.org/fx"
+	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/lotus/node/impl/full"
 
@@ -21,13 +22,41 @@ type MpoolNonceAPI struct {
 	StateAPI full.StateAPI
 }
 
-// GetNonce gets the nonce from actor state
+// GetNonce gets the nonce from current chain head.
 func (a *MpoolNonceAPI) GetNonce(addr address.Address) (uint64, error) {
-	act, err := a.StateAPI.StateGetActor(context.Background(), addr, types.EmptyTSK)
+	ts := a.StateAPI.Chain.GetHeaviestTipSet()
+
+	// make sure we have a key address so we can compare with messages
+	keyAddr, err := a.StateAPI.StateManager.ResolveToKeyAddress(context.TODO(), addr, ts)
+	if err != nil {
+		return 0, err
+	}
+
+	// Load the last nonce from the state, if it exists.
+	highestNonce := uint64(0)
+	if baseActor, err := a.StateAPI.StateManager.LoadActorRaw(context.TODO(), addr, ts.ParentState()); err != nil {
+		if !xerrors.Is(err, types.ErrActorNotFound) {
+			return 0, err
+		}
+	} else {
+		highestNonce = baseActor.Nonce
+	}
+
+	// Otherwise, find the highest nonce in the tipset.
+	msgs, err := a.StateAPI.Chain.MessagesForTipset(ts)
 	if err != nil {
 		return 0, err
 	}
-	return act.Nonce, nil
+	for _, msg := range msgs {
+		vmmsg := msg.VMMessage()
+		if vmmsg.From != keyAddr {
+			continue
+		}
+		if vmmsg.Nonce >= highestNonce {
+			highestNonce = vmmsg.Nonce + 1
+		}
+	}
+	return highestNonce, nil
 }
 
 var _ messagesigner.MpoolNonceAPI = (*MpoolNonceAPI)(nil)
diff --git a/node/node_test.go b/node/node_test.go
index 69d6147bcbf..fb1f1e810b8 100644
--- a/node/node_test.go
+++ b/node/node_test.go
@@ -92,6 +92,10 @@ func TestAPIDealFlowReal(t *testing.T) {
 }
 
 func TestDealMining(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
 	logging.SetLogLevel("miner", "ERROR")
 	logging.SetLogLevel("chainstore", "ERROR")
 	logging.SetLogLevel("chain", "ERROR")