diff --git a/cmd/neofs-node/reputation/common/managers.go b/cmd/neofs-node/reputation/common/managers.go
index bec46897e..e9260a410 100644
--- a/cmd/neofs-node/reputation/common/managers.go
+++ b/cmd/neofs-node/reputation/common/managers.go
@@ -18,6 +18,7 @@ import (
 type managerBuilder struct {
 	log   *logger.Logger
 	nmSrc netmapcore.Source
+	opts  *mngOptions
 }
 
 // ManagersPrm groups the required parameters of the managerBuilder's constructor.
@@ -50,6 +51,7 @@ func NewManagerBuilder(prm ManagersPrm, opts ...MngOption) common.ManagerBuilder
 	return &managerBuilder{
 		log:   o.log,
 		nmSrc: prm.NetMapSource,
+		opts:  o,
 	}
 }
 
diff --git a/cmd/neofs-node/reputation/intermediate/calculator.go b/cmd/neofs-node/reputation/intermediate/calculator.go
new file mode 100644
index 000000000..11f69adfc
--- /dev/null
+++ b/cmd/neofs-node/reputation/intermediate/calculator.go
@@ -0,0 +1,27 @@
+package intermediate
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/eigentrust"
+	eigencalc "github.com/nspcc-dev/neofs-node/pkg/services/reputation/eigentrust/calculator"
+	eigentrustctrl "github.com/nspcc-dev/neofs-node/pkg/services/reputation/eigentrust/controller"
+)
+
+// DaughtersTrustCalculator wraps EigenTrust calculator and implements
+// eigentrust/calculator's DaughtersTrustCalculator interface.
+type DaughtersTrustCalculator struct {
+	Calculator *eigencalc.Calculator
+}
+
+// Calculate converts and passes values to wrapped calculator.
+func (c *DaughtersTrustCalculator) Calculate(ctx eigentrustctrl.IterationContext) {
+	calcPrm := eigencalc.CalculatePrm{}
+	epochIteration := eigentrust.EpochIteration{}
+
+	epochIteration.SetEpoch(ctx.Epoch())
+	epochIteration.SetI(ctx.I())
+
+	calcPrm.SetLast(ctx.Last())
+	calcPrm.SetEpochIteration(epochIteration)
+
+	c.Calculator.Calculate(calcPrm)
+}
diff --git a/cmd/neofs-node/reputation/intermediate/consumers.go b/cmd/neofs-node/reputation/intermediate/consumers.go
index 9977454f3..048147121 100644
--- a/cmd/neofs-node/reputation/intermediate/consumers.go
+++ b/cmd/neofs-node/reputation/intermediate/consumers.go
@@ -2,7 +2,6 @@ package intermediate
 
 import (
 	"errors"
-	"fmt"
 
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/common"
@@ -36,7 +35,6 @@ func (w *ConsumerTrustWriter) Write(ctx common.Context, t reputation.Trust) erro
 	trust.SetEpoch(eiCtx.Epoch())
 	trust.SetI(eiCtx.I())
 
-	fmt.Println("decided to save consumers trusts to storage for epoch and iteration: ", eiCtx.Epoch(), eiCtx.I())
 	w.storage.Put(trust)
 	return nil
 }
diff --git a/cmd/neofs-node/reputation/intermediate/contract.go b/cmd/neofs-node/reputation/intermediate/contract.go
new file mode 100644
index 000000000..a86acddc4
--- /dev/null
+++ b/cmd/neofs-node/reputation/intermediate/contract.go
@@ -0,0 +1,143 @@
+package intermediate
+
+import (
+	"crypto/ecdsa"
+	"fmt"
+
+	apireputation "github.com/nspcc-dev/neofs-api-go/pkg/reputation"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/client/reputation/wrapper"
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/eigentrust"
+	eigentrustcalc "github.com/nspcc-dev/neofs-node/pkg/services/reputation/eigentrust/calculator"
+	"github.com/nspcc-dev/neofs-node/pkg/util/logger"
+	"go.uber.org/zap"
+)
+
+// FinalWriterProviderPrm groups the required parameters of the FinalWriterProvider's constructor.
+//
+// All values must comply with the requirements imposed on them.
+// Passing incorrect parameter values will result in constructor
+// failure (error or panic depending on the implementation).
+type FinalWriterProviderPrm struct {
+	PrivatKey *ecdsa.PrivateKey
+	PubKey    []byte
+	Client    *wrapper.ClientWrapper
+}
+
+// NewFinalWriterProvider creates a new instance of the FinalWriterProvider.
+//
+// Panics if at least one value of the parameters is invalid.
+//
+// The created FinalWriterProvider does not require additional
+// initialization and is completely ready for work.
+func NewFinalWriterProvider(prm FinalWriterProviderPrm, opts ...FinalWriterOption) *FinalWriterProvider {
+	o := defaultFinalWriterOptionsOpts()
+
+	for i := range opts {
+		opts[i](o)
+	}
+
+	return &FinalWriterProvider{
+		prm:  prm,
+		opts: o,
+	}
+}
+
+type FinalWriterProvider struct {
+	prm  FinalWriterProviderPrm
+	opts *finalWriterOptions
+}
+
+func (fwp FinalWriterProvider) InitIntermediateWriter(
+	_ eigentrustcalc.Context) (eigentrustcalc.IntermediateWriter, error) {
+	return &FinalWriter{
+		privatKey: fwp.prm.PrivatKey,
+		pubKey:    fwp.prm.PubKey,
+		client:    fwp.prm.Client,
+		l:         fwp.opts.log,
+	}, nil
+
+}
+
+type FinalWriter struct {
+	privatKey *ecdsa.PrivateKey
+	pubKey    []byte
+	client    *wrapper.ClientWrapper
+
+	l *logger.Logger
+}
+
+func (fw FinalWriter) WriteIntermediateTrust(t eigentrust.IterationTrust) error {
+	args := wrapper.PutArgs{}
+
+	var trustedPublicKey [33]byte
+	copy(trustedPublicKey[:], t.Peer().Bytes())
+
+	apiTrustedPeerID := apireputation.NewPeerID()
+	apiTrustedPeerID.SetPublicKey(trustedPublicKey)
+
+	apiTrust := apireputation.NewTrust()
+	apiTrust.SetValue(t.Value().Float64())
+	apiTrust.SetPeer(apiTrustedPeerID)
+
+	var managerPublicKey [33]byte
+	copy(managerPublicKey[:], fw.pubKey)
+
+	apiMangerPeerID := apireputation.NewPeerID()
+	apiMangerPeerID.SetPublicKey(managerPublicKey)
+
+	gTrust := apireputation.NewGlobalTrust()
+	gTrust.SetTrust(apiTrust)
+	gTrust.SetManager(apiMangerPeerID)
+
+	err := gTrust.Sign(fw.privatKey)
+	if err != nil {
+		fw.l.Debug(
+			"failed to sign global trust",
+			zap.Error(err),
+		)
+		return fmt.Errorf("failed to sign global trust: %w", err)
+	}
+
+	args.SetEpoch(t.Epoch())
+	args.SetValue(*gTrust)
+	args.SetPeerID(*apiTrustedPeerID)
+
+	err = fw.client.Put(
+		args,
+	)
+	if err != nil {
+		fw.l.Debug(
+			"failed to write global trust to contract",
+			zap.Error(err),
+		)
+		return fmt.Errorf("failed to write global trust to contract: %w", err)
+	}
+
+	fw.l.Debug(
+		"sent global trust to contract",
+		zap.Uint64("epoch", t.Epoch()),
+		zap.Float64("value", t.Value().Float64()),
+	)
+
+	return nil
+}
+
+type finalWriterOptions struct {
+	log *logger.Logger
+}
+
+type FinalWriterOption func(*finalWriterOptions)
+
+func defaultFinalWriterOptionsOpts() *finalWriterOptions {
+	return &finalWriterOptions{
+		log: zap.L(),
+	}
+}
+
+func FinalWriterWithLogger(l *logger.Logger) FinalWriterOption {
+	return func(o *finalWriterOptions) {
+		if l != nil {
+			o.log = l
+		}
+	}
+}
diff --git a/cmd/neofs-node/reputation/intermediate/remote.go b/cmd/neofs-node/reputation/intermediate/remote.go
index 6120491d0..86a11f317 100644
--- a/cmd/neofs-node/reputation/intermediate/remote.go
+++ b/cmd/neofs-node/reputation/intermediate/remote.go
@@ -2,6 +2,7 @@ package intermediate
 
 import (
 	"crypto/ecdsa"
+
 	apiClient "github.com/nspcc-dev/neofs-api-go/pkg/client"
 	reputationapi "github.com/nspcc-dev/neofs-api-go/pkg/reputation"
 	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/reputation/common"
diff --git a/cmd/neofs-node/reputation/intermediate/storage.go b/cmd/neofs-node/reputation/intermediate/storage.go
index c3053e346..bf62019ce 100644
--- a/cmd/neofs-node/reputation/intermediate/storage.go
+++ b/cmd/neofs-node/reputation/intermediate/storage.go
@@ -21,8 +21,8 @@ func (i InitialTrustSource) InitialTrust(reputation.PeerID) (reputation.TrustVal
 // DaughterTrustIteratorProvider is implementation of the
 // reputation/eigentrust/calculator's DaughterTrustIteratorProvider interface.
 type DaughterTrustIteratorProvider struct {
-	daughterStorage *daughters.Storage
-	consumerStorage *consumerstorage.Storage
+	DaughterStorage *daughters.Storage
+	ConsumerStorage *consumerstorage.Storage
 }
 
 type ErrNoData struct {
@@ -46,7 +46,7 @@ func (e *ErrNoData) Error() string {
 // specified epoch and daughter's PeerId.
 func (ip *DaughterTrustIteratorProvider) InitDaughterIterator(ctx eigentrustcalc.Context,
 	p reputation.PeerID) (eigentrustcalc.TrustIterator, error) {
-	daughterIterator, ok := ip.daughterStorage.DaughterTrusts(ctx.Epoch(), p)
+	daughterIterator, ok := ip.DaughterStorage.DaughterTrusts(ctx.Epoch(), p)
 	if !ok {
 		return nil, &ErrNoData{
 			daughter:    p,
@@ -66,7 +66,7 @@ func (ip *DaughterTrustIteratorProvider) InitDaughterIterator(ctx eigentrustcalc
 // specified epoch.
 func (ip *DaughterTrustIteratorProvider) InitAllDaughtersIterator(
 	ctx eigentrustcalc.Context) (eigentrustcalc.PeerTrustsIterator, error) {
-	iter, ok := ip.daughterStorage.AllDaughterTrusts(ctx.Epoch())
+	iter, ok := ip.DaughterStorage.AllDaughterTrusts(ctx.Epoch())
 	if !ok {
 		return nil, &ErrNoData{epoch: ctx.Epoch()}
 	}
@@ -83,7 +83,7 @@ func (ip *DaughterTrustIteratorProvider) InitAllDaughtersIterator(
 // specified epoch and iteration.
 func (ip *DaughterTrustIteratorProvider) InitConsumersIterator(
 	ctx eigentrustcalc.Context) (eigentrustcalc.PeerTrustsIterator, error) {
-	consumerIterator, ok := ip.consumerStorage.Consumers(ctx.Epoch(), ctx.I())
+	consumerIterator, ok := ip.ConsumerStorage.Consumers(ctx.Epoch(), ctx.I())
 	if !ok {
 		return nil, &ErrNoData{epoch: ctx.Epoch()}
 	}
diff --git a/go.sum b/go.sum
index 1c423297b..b0903f62f 100644
Binary files a/go.sum and b/go.sum differ
diff --git a/pkg/services/reputation/eigentrust/calculator/calculator.go b/pkg/services/reputation/eigentrust/calculator/calculator.go
index b94676361..883cecf8c 100644
--- a/pkg/services/reputation/eigentrust/calculator/calculator.go
+++ b/pkg/services/reputation/eigentrust/calculator/calculator.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/common"
 	"github.com/nspcc-dev/neofs-node/pkg/util"
 )
 
@@ -26,7 +27,7 @@ type Prm struct {
 
 	DaughterTrustSource DaughterTrustIteratorProvider
 
-	IntermediateValueTarget IntermediateWriterProvider
+	IntermediateValueTarget common.WriterProvider
 
 	FinalResultTarget IntermediateWriterProvider
 
diff --git a/pkg/services/reputation/eigentrust/calculator/calls.go b/pkg/services/reputation/eigentrust/calculator/calls.go
index c10a73a87..a4f24ce42 100644
--- a/pkg/services/reputation/eigentrust/calculator/calls.go
+++ b/pkg/services/reputation/eigentrust/calculator/calls.go
@@ -15,17 +15,16 @@ type CalculatePrm struct {
 	ei eigentrust.EpochIteration
 }
 
+func (p *CalculatePrm) SetLast(last bool) {
+	p.last = last
+}
+
 func (p *CalculatePrm) SetEpochIteration(ei eigentrust.EpochIteration) {
 	p.ei = ei
 }
 
-type iterContext struct {
-	context.Context
-	eigentrust.EpochIteration
-}
-
 func (c *Calculator) Calculate(prm CalculatePrm) {
-	ctx := iterContext{
+	ctx := eigentrust.IterContext{
 		Context:        context.Background(),
 		EpochIteration: prm.ei,
 	}
@@ -139,7 +138,7 @@ func (c *Calculator) iterateDaughter(p iterDaughterPrm) {
 	var intermediateTrust eigentrust.IterationTrust
 
 	intermediateTrust.SetEpoch(p.ctx.Epoch())
-	intermediateTrust.SetTrustingPeer(p.id)
+	intermediateTrust.SetPeer(p.id)
 	intermediateTrust.SetI(p.ctx.I())
 
 	if p.lastIter {
@@ -163,7 +162,7 @@ func (c *Calculator) iterateDaughter(p iterDaughterPrm) {
 			return
 		}
 	} else {
-		intermediateWriter, err := c.prm.IntermediateValueTarget.InitIntermediateWriter(p.ctx)
+		intermediateWriter, err := c.prm.IntermediateValueTarget.InitWriter(p.ctx)
 		if err != nil {
 			c.opts.log.Debug("init intermediate writer failure",
 				zap.String("error", err.Error()),
@@ -184,10 +183,7 @@ func (c *Calculator) iterateDaughter(p iterDaughterPrm) {
 
 			trust.SetValue(val)
 
-			intermediateTrust.SetPeer(trust.Peer())
-			intermediateTrust.SetValue(val)
-
-			err := intermediateWriter.WriteIntermediateTrust(intermediateTrust)
+			err := intermediateWriter.Write(p.ctx, trust)
 			if err != nil {
 				c.opts.log.Debug("write intermediate value failure",
 					zap.String("error", err.Error()),
@@ -201,6 +197,14 @@ func (c *Calculator) iterateDaughter(p iterDaughterPrm) {
 				zap.String("error", err.Error()),
 			)
 		}
+
+		err = intermediateWriter.Close()
+		if err != nil {
+			c.opts.log.Error(
+				"could not close intermediate writer",
+				zap.String("error", err.Error()),
+			)
+		}
 	}
 }
 
@@ -214,7 +218,7 @@ func (c *Calculator) sendInitialValues(ctx Context) {
 		return
 	}
 
-	intermediateWriter, err := c.prm.IntermediateValueTarget.InitIntermediateWriter(ctx)
+	intermediateWriter, err := c.prm.IntermediateValueTarget.InitWriter(ctx)
 	if err != nil {
 		c.opts.log.Debug("init intermediate writer failure",
 			zap.String("error", err.Error()),
@@ -223,14 +227,7 @@ func (c *Calculator) sendInitialValues(ctx Context) {
 		return
 	}
 
-	var intermediateTrust eigentrust.IterationTrust
-
-	intermediateTrust.SetEpoch(ctx.Epoch())
-	intermediateTrust.SetI(ctx.I())
-
 	err = daughterIter.Iterate(func(daughter reputation.PeerID, iterator TrustIterator) error {
-		intermediateTrust.SetTrustingPeer(daughter)
-
 		return iterator.Iterate(func(trust reputation.Trust) error {
 			trusted := trust.Peer()
 
@@ -245,12 +242,10 @@ func (c *Calculator) sendInitialValues(ctx Context) {
 				return nil
 			}
 
-			intermediateTrust.SetPeer(trusted)
-
 			initTrust.Mul(trust.Value())
-			intermediateTrust.SetValue(initTrust)
+			trust.SetValue(initTrust)
 
-			err = intermediateWriter.WriteIntermediateTrust(intermediateTrust)
+			err = intermediateWriter.Write(ctx, trust)
 			if err != nil {
 				c.opts.log.Debug("write intermediate value failure",
 					zap.String("error", err.Error()),
@@ -267,4 +262,11 @@ func (c *Calculator) sendInitialValues(ctx Context) {
 			zap.String("error", err.Error()),
 		)
 	}
+
+	err = intermediateWriter.Close()
+	if err != nil {
+		c.opts.log.Debug("could not close intermediate writer",
+			zap.String("error", err.Error()),
+		)
+	}
 }
diff --git a/pkg/services/reputation/eigentrust/calculator/deps.go b/pkg/services/reputation/eigentrust/calculator/deps.go
index b52151a6a..f94de3d49 100644
--- a/pkg/services/reputation/eigentrust/calculator/deps.go
+++ b/pkg/services/reputation/eigentrust/calculator/deps.go
@@ -28,13 +28,27 @@ type TrustIterator interface {
 
 type PeerTrustsHandler func(reputation.PeerID, TrustIterator) error
 
+// PeerTrustsIterator must iterate over all nodes(PeerIDs) and provide
+// TrustIterator for iteration over node's Trusts to others peers.
 type PeerTrustsIterator interface {
 	Iterate(PeerTrustsHandler) error
 }
 
 type DaughterTrustIteratorProvider interface {
-	InitDaughterIterator(Context, reputation.PeerID) (TrustIterator, error)
-	InitAllDaughtersIterator(Context) (PeerTrustsIterator, error)
+	// InitDaughterIterator must init TrustIterator
+	// that iterates over received local trusts from
+	// daughter p for ctx.Epoch() epoch.
+	InitDaughterIterator(ctx Context, p reputation.PeerID) (TrustIterator, error)
+	// InitAllDaughtersIterator must init PeerTrustsIterator
+	// that must iterate over all daughters of the current
+	// node(manager) and all trusts received from them for
+	// ctx.Epoch() epoch.
+	InitAllDaughtersIterator(ctx Context) (PeerTrustsIterator, error)
+	// InitConsumersIterator must init PeerTrustsIterator
+	// that must iterate over all daughters of the current
+	// node(manager) and their consumers' trusts received
+	// from other managers for ctx.Epoch() epoch and
+	// ctx.I() iteration.
 	InitConsumersIterator(Context) (PeerTrustsIterator, error)
 }
 
diff --git a/pkg/services/reputation/eigentrust/controller/calls.go b/pkg/services/reputation/eigentrust/controller/calls.go
index fbef675f5..27657ebf5 100644
--- a/pkg/services/reputation/eigentrust/controller/calls.go
+++ b/pkg/services/reputation/eigentrust/controller/calls.go
@@ -9,7 +9,7 @@ import (
 
 // ContinuePrm groups the required parameters of Continue operation.
 type ContinuePrm struct {
-	epoch uint64
+	Epoch uint64
 }
 
 type iterContext struct {
@@ -35,20 +35,24 @@ func (c *Controller) Continue(prm ContinuePrm) {
 	c.mtx.Lock()
 
 	{
-		iterCtx, ok := c.mCtx[prm.epoch]
+		iterCtx, ok := c.mCtx[prm.Epoch]
 		if !ok {
-			iterCtx := new(iterContextCancel)
-			c.mCtx[prm.epoch] = iterCtx
+			iterCtx = new(iterContextCancel)
+			c.mCtx[prm.Epoch] = iterCtx
 
 			iterCtx.Context, iterCtx.cancel = context.WithCancel(context.Background())
+			iterCtx.EpochIteration.SetEpoch(prm.Epoch)
 		} else {
 			iterCtx.cancel()
 		}
 
-		iterCtx.last = iterCtx.I() == c.prm.IterationNumber
+		iterCtx.last = iterCtx.I() == c.iterationNumber-1
 
 		err := c.prm.WorkerPool.Submit(func() {
 			c.prm.DaughtersTrustCalculator.Calculate(iterCtx.iterContext)
+
+			// iteration++
+			iterCtx.Increment()
 		})
 		if err != nil {
 			c.opts.log.Debug("iteration submit failure",
@@ -57,11 +61,21 @@ func (c *Controller) Continue(prm ContinuePrm) {
 		}
 
 		if iterCtx.last {
-			delete(c.mCtx, prm.epoch)
-			// In this case and worker pool failure we can mark epoch
-			// number as already processed, but in any case it grows up
-			// during normal operation of the system. Also, such information
 			// will only live while the application is alive.
+			// during normal operation of the system. Also, such information
+			// number as already processed, but in any case it grows up
+			// In this case and worker pool failure we can mark epoch
+			delete(c.mCtx, prm.Epoch)
+
+			iterations, err := c.prm.IterationsProvider.EigenTrustIterations()
+			if err != nil {
+				c.opts.log.Debug(
+					"could not get iteration numbers",
+					zap.String("error", err.Error()),
+				)
+			} else {
+				c.iterationNumber = uint32(iterations)
+			}
 		}
 	}
 
diff --git a/pkg/services/reputation/eigentrust/controller/controller.go b/pkg/services/reputation/eigentrust/controller/controller.go
index 9313af586..8c1f2d2b4 100644
--- a/pkg/services/reputation/eigentrust/controller/controller.go
+++ b/pkg/services/reputation/eigentrust/controller/controller.go
@@ -13,14 +13,15 @@ import (
 // Passing incorrect parameter values will result in constructor
 // failure (error or panic depending on the implementation).
 type Prm struct {
-	// Number of iterations
-	IterationNumber uint32
-
 	// Component of computing iteration of EigenTrust algorithm.
 	//
 	// Must not be nil.
 	DaughtersTrustCalculator DaughtersTrustCalculator
 
+	// IterationsProvider provides information about numbers
+	// of iterations for algorithm.
+	IterationsProvider IterationsProvider
+
 	// Routine execution pool for single epoch iteration.
 	WorkerPool util.WorkerPool
 }
@@ -45,6 +46,9 @@ type Controller struct {
 
 	opts *options
 
+	// Number of iterations
+	iterationNumber uint32
+
 	mtx  sync.Mutex
 	mCtx map[uint64]*iterContextCancel
 }
@@ -63,14 +67,19 @@ func panicOnPrmValue(n string, v interface{}) {
 // initialization and is completely ready for work.
 func New(prm Prm, opts ...Option) *Controller {
 	switch {
-	case prm.IterationNumber == 0:
-		panicOnPrmValue("IterationNumber", prm.IterationNumber)
+	case prm.IterationsProvider == nil:
+		panicOnPrmValue("IterationNumber", prm.IterationsProvider)
 	case prm.WorkerPool == nil:
 		panicOnPrmValue("WorkerPool", prm.WorkerPool)
 	case prm.DaughtersTrustCalculator == nil:
 		panicOnPrmValue("DaughtersTrustCalculator", prm.DaughtersTrustCalculator)
 	}
 
+	iterations, err := prm.IterationsProvider.EigenTrustIterations()
+	if err != nil {
+		panic(fmt.Errorf("could not init EigenTrust controller: could not get num of iterations: %w", err))
+	}
+
 	o := defaultOpts()
 
 	for _, opt := range opts {
@@ -78,8 +87,9 @@ func New(prm Prm, opts ...Option) *Controller {
 	}
 
 	return &Controller{
-		prm:  prm,
-		opts: o,
-		mCtx: make(map[uint64]*iterContextCancel),
+		iterationNumber: uint32(iterations),
+		prm:             prm,
+		opts:            o,
+		mCtx:            make(map[uint64]*iterContextCancel),
 	}
 }
diff --git a/pkg/services/reputation/eigentrust/controller/deps.go b/pkg/services/reputation/eigentrust/controller/deps.go
index 394a667c8..ade2f6a2d 100644
--- a/pkg/services/reputation/eigentrust/controller/deps.go
+++ b/pkg/services/reputation/eigentrust/controller/deps.go
@@ -33,3 +33,9 @@ type DaughtersTrustCalculator interface {
 	// Execution should be interrupted if ctx.Last().
 	Calculate(ctx IterationContext)
 }
+
+// IterationsProvider must provides information about numbers
+// of iterations for algorithm.
+type IterationsProvider interface {
+	EigenTrustIterations() (uint64, error)
+}
diff --git a/pkg/services/reputation/eigentrust/iteration.go b/pkg/services/reputation/eigentrust/iteration.go
index 004219963..959c2c23a 100644
--- a/pkg/services/reputation/eigentrust/iteration.go
+++ b/pkg/services/reputation/eigentrust/iteration.go
@@ -1,6 +1,8 @@
 package eigentrust
 
 import (
+	"context"
+
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
 )
 
@@ -25,7 +27,30 @@ func (x *EpochIteration) SetI(i uint32) {
 	x.i = i
 }
 
+func (x *EpochIteration) Increment() {
+	x.i++
+}
+
 type IterationTrust struct {
 	EpochIteration
 	reputation.Trust
 }
+
+// IterContext aggregates context and data required for
+// iterations.
+type IterContext struct {
+	context.Context
+	EpochIteration
+}
+
+func NewIterContext(ctx context.Context, epoch uint64, iter uint32) *IterContext {
+	ei := EpochIteration{}
+
+	ei.SetI(iter)
+	ei.SetEpoch(epoch)
+
+	return &IterContext{
+		Context:        ctx,
+		EpochIteration: ei,
+	}
+}