diff --git a/beacon-chain/rpc/eth/validator/validator.go b/beacon-chain/rpc/eth/validator/validator.go
index f34938c45..e0c94027a 100644
--- a/beacon-chain/rpc/eth/validator/validator.go
+++ b/beacon-chain/rpc/eth/validator/validator.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"sort"
 	"strconv"
+	"time"
 
 	"github.com/golang/protobuf/ptypes/empty"
 	"github.com/pkg/errors"
@@ -415,8 +416,75 @@ func (vs *Server) SubmitBeaconCommitteeSubscription(ctx context.Context, req *et
 	return &emptypb.Empty{}, nil
 }
 
-func (vs *Server) SubmitSyncCommitteeSubscription(ctx context.Context, request *ethpbv2.SubmitSyncCommitteeSubscriptionsRequest) (*empty.Empty, error) {
-	panic("implement me")
+// SubmitSyncCommitteeSubscription subscribe to a number of sync committee subnets.
+//
+// Subscribing to sync committee subnets is an action performed by VC to enable
+// network participation in Altair networks, and only required if the VC has an active
+// validator in an active sync committee.
+func (vs *Server) SubmitSyncCommitteeSubscription(ctx context.Context, req *ethpbv2.SubmitSyncCommitteeSubscriptionsRequest) (*empty.Empty, error) {
+	ctx, span := trace.StartSpan(ctx, "validator.SubmitSyncCommitteeSubscription")
+	defer span.End()
+
+	if vs.SyncChecker.Syncing() {
+		return nil, status.Error(codes.Unavailable, "Syncing to latest head, not ready to respond")
+	}
+	if len(req.Data) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "No subscriptions provided")
+	}
+	s, err := vs.HeadFetcher.HeadState(ctx)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "Could not get head state: %v", err)
+	}
+	currEpoch := helpers.SlotToEpoch(s.Slot())
+	validators := make([]state.ReadOnlyValidator, len(req.Data))
+	for i, sub := range req.Data {
+		val, err := s.ValidatorAtIndexReadOnly(sub.ValidatorIndex)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "Could not get validator at index %d: %v", sub.ValidatorIndex, err)
+		}
+		valStatus, err := rpchelpers.ValidatorSubStatus(val, currEpoch)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "Could not get validator status at index %d: %v", sub.ValidatorIndex, err)
+		}
+		if valStatus != ethpbv1.ValidatorStatus_ACTIVE_ONGOING && valStatus != ethpbv1.ValidatorStatus_ACTIVE_EXITING {
+			return nil, status.Errorf(codes.InvalidArgument, "Validator at index %d is not active or exiting: %v", sub.ValidatorIndex, err)
+		}
+		validators[i] = val
+	}
+
+	currPeriod := helpers.SyncCommitteePeriod(currEpoch)
+	startEpoch := types.Epoch(currPeriod * uint64(params.BeaconConfig().EpochsPerSyncCommitteePeriod))
+
+	for i, sub := range req.Data {
+		if sub.UntilEpoch < currEpoch {
+			return nil, status.Errorf(codes.InvalidArgument, "Epoch for subscription at index %d is in the past. It must be at least %d", i, currEpoch)
+		}
+		maxValidEpoch := startEpoch + params.BeaconConfig().EpochsPerSyncCommitteePeriod
+		if sub.UntilEpoch > maxValidEpoch {
+			return nil, status.Errorf(
+				codes.InvalidArgument,
+				"Epoch for subscription at index %d is too far in the future. It can be at most %d",
+				i,
+				maxValidEpoch,
+			)
+		}
+	}
+
+	for i, sub := range req.Data {
+		pubkey48 := validators[i].PublicKey()
+		// Handle overflow in the event current epoch is less than end epoch.
+		// This is an impossible condition, so it is a defensive check.
+		epochsToWatch, err := sub.UntilEpoch.SafeSub(uint64(startEpoch))
+		if err != nil {
+			epochsToWatch = 0
+		}
+		epochDuration := time.Duration(params.BeaconConfig().SlotsPerEpoch.Mul(params.BeaconConfig().SecondsPerSlot)) * time.Second
+		totalDuration := epochDuration * time.Duration(epochsToWatch)
+
+		cache.SyncSubnetIDs.AddSyncCommitteeSubnets(pubkey48[:], startEpoch, sub.SyncCommitteeIndices, totalDuration)
+	}
+
+	return &empty.Empty{}, nil
 }
 
 func (vs *Server) ProduceSyncCommitteeContribution(
diff --git a/beacon-chain/rpc/eth/validator/validator_test.go b/beacon-chain/rpc/eth/validator/validator_test.go
index 9cbabfb42..4837d4268 100644
--- a/beacon-chain/rpc/eth/validator/validator_test.go
+++ b/beacon-chain/rpc/eth/validator/validator_test.go
@@ -852,6 +852,147 @@ func TestSubmitBeaconCommitteeSubscription_SyncNotReady(t *testing.T) {
 	assert.ErrorContains(t, "Syncing to latest head, not ready to respond", err)
 }
 
+func TestSubmitSyncCommitteeSubscription(t *testing.T) {
+	ctx := context.Background()
+	genesis := sharedtestutil.NewBeaconBlock()
+	deposits, _, err := sharedtestutil.DeterministicDepositsAndKeys(64)
+	require.NoError(t, err)
+	eth1Data, err := sharedtestutil.DeterministicEth1Data(len(deposits))
+	require.NoError(t, err)
+	bs, err := sharedtestutil.GenesisBeaconState(context.Background(), deposits, 0, eth1Data)
+	require.NoError(t, err, "Could not set up genesis state")
+	// Set state to epoch 1.
+	require.NoError(t, bs.SetSlot(params.BeaconConfig().SlotsPerEpoch))
+	genesisRoot, err := genesis.Block.HashTreeRoot()
+	require.NoError(t, err, "Could not get signing root")
+	roots := make([][]byte, params.BeaconConfig().SlotsPerHistoricalRoot)
+	roots[0] = genesisRoot[:]
+	require.NoError(t, bs.SetBlockRoots(roots))
+
+	pubkeys := make([][]byte, len(deposits))
+	for i := 0; i < len(deposits); i++ {
+		pubkeys[i] = deposits[i].Data.PublicKey
+	}
+
+	chainSlot := types.Slot(0)
+	chain := &mockChain.ChainService{
+		State: bs, Root: genesisRoot[:], Slot: &chainSlot,
+	}
+	vs := &Server{
+		HeadFetcher:    chain,
+		TimeFetcher:    chain,
+		SyncChecker:    &mockSync.Sync{IsSyncing: false},
+		V1Alpha1Server: &v1alpha1validator.Server{},
+	}
+
+	t.Run("Single subscription", func(t *testing.T) {
+		cache.SyncSubnetIDs.EmptyAllCaches()
+		req := &ethpbv2.SubmitSyncCommitteeSubscriptionsRequest{
+			Data: []*ethpbv2.SyncCommitteeSubscription{
+				{
+					ValidatorIndex:       0,
+					SyncCommitteeIndices: []uint64{0, 2},
+					UntilEpoch:           1,
+				},
+			},
+		}
+		_, err = vs.SubmitSyncCommitteeSubscription(ctx, req)
+		require.NoError(t, err)
+		subnets, _, _, _ := cache.SyncSubnetIDs.GetSyncCommitteeSubnets(pubkeys[0], 0)
+		require.Equal(t, 2, len(subnets))
+		assert.Equal(t, uint64(0), subnets[0])
+		assert.Equal(t, uint64(2), subnets[1])
+	})
+
+	t.Run("Multiple subscriptions", func(t *testing.T) {
+		cache.SyncSubnetIDs.EmptyAllCaches()
+		req := &ethpbv2.SubmitSyncCommitteeSubscriptionsRequest{
+			Data: []*ethpbv2.SyncCommitteeSubscription{
+				{
+					ValidatorIndex:       0,
+					SyncCommitteeIndices: []uint64{0},
+					UntilEpoch:           1,
+				},
+				{
+					ValidatorIndex:       1,
+					SyncCommitteeIndices: []uint64{2},
+					UntilEpoch:           1,
+				},
+			},
+		}
+		_, err = vs.SubmitSyncCommitteeSubscription(ctx, req)
+		require.NoError(t, err)
+		subnets, _, _, _ := cache.SyncSubnetIDs.GetSyncCommitteeSubnets(pubkeys[0], 0)
+		require.Equal(t, 1, len(subnets))
+		assert.Equal(t, uint64(0), subnets[0])
+		subnets, _, _, _ = cache.SyncSubnetIDs.GetSyncCommitteeSubnets(pubkeys[1], 0)
+		require.Equal(t, 1, len(subnets))
+		assert.Equal(t, uint64(2), subnets[0])
+	})
+
+	t.Run("No subscriptions", func(t *testing.T) {
+		req := &ethpbv2.SubmitSyncCommitteeSubscriptionsRequest{
+			Data: make([]*ethpbv2.SyncCommitteeSubscription, 0),
+		}
+		_, err = vs.SubmitSyncCommitteeSubscription(ctx, req)
+		require.NotNil(t, err)
+		assert.ErrorContains(t, "No subscriptions provided", err)
+	})
+
+	t.Run("Invalid validator index", func(t *testing.T) {
+		req := &ethpbv2.SubmitSyncCommitteeSubscriptionsRequest{
+			Data: []*ethpbv2.SyncCommitteeSubscription{
+				{
+					ValidatorIndex:       99,
+					SyncCommitteeIndices: []uint64{},
+					UntilEpoch:           1,
+				},
+			},
+		}
+		_, err = vs.SubmitSyncCommitteeSubscription(ctx, req)
+		require.NotNil(t, err)
+		assert.ErrorContains(t, "Could not get validator at index 99", err)
+	})
+
+	t.Run("Epoch in the past", func(t *testing.T) {
+		req := &ethpbv2.SubmitSyncCommitteeSubscriptionsRequest{
+			Data: []*ethpbv2.SyncCommitteeSubscription{
+				{
+					ValidatorIndex:       0,
+					SyncCommitteeIndices: []uint64{},
+					UntilEpoch:           0,
+				},
+			},
+		}
+		_, err = vs.SubmitSyncCommitteeSubscription(ctx, req)
+		require.NotNil(t, err)
+		assert.ErrorContains(t, "Epoch for subscription at index 0 is in the past", err)
+	})
+
+	t.Run("Epoch too far in the future", func(t *testing.T) {
+		req := &ethpbv2.SubmitSyncCommitteeSubscriptionsRequest{
+			Data: []*ethpbv2.SyncCommitteeSubscription{
+				{
+					ValidatorIndex:       0,
+					SyncCommitteeIndices: []uint64{},
+					UntilEpoch:           params.BeaconConfig().EpochsPerSyncCommitteePeriod + 1,
+				},
+			},
+		}
+		_, err = vs.SubmitSyncCommitteeSubscription(ctx, req)
+		require.NotNil(t, err)
+		assert.ErrorContains(t, "Epoch for subscription at index 0 is too far in the future", err)
+	})
+}
+
+func TestSubmitSyncCommitteeSubscription_SyncNotReady(t *testing.T) {
+	vs := &Server{
+		SyncChecker: &mockSync.Sync{IsSyncing: true},
+	}
+	_, err := vs.SubmitSyncCommitteeSubscription(context.Background(), &ethpbv2.SubmitSyncCommitteeSubscriptionsRequest{})
+	assert.ErrorContains(t, "Syncing to latest head, not ready to respond", err)
+}
+
 func TestSubmitAggregateAndProofs(t *testing.T) {
 	ctx := context.Background()
 	params.SetupTestConfigCleanup(t)
diff --git a/proto/eth/v2/validator.pb.go b/proto/eth/v2/validator.pb.go
index 52c1b2e8a..bae81f756 100755
--- a/proto/eth/v2/validator.pb.go
+++ b/proto/eth/v2/validator.pb.go
@@ -356,9 +356,9 @@ type SyncCommitteeSubscription struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	ValidatorIndex       github_com_prysmaticlabs_eth2_types.ValidatorIndex   `protobuf:"varint,1,opt,name=validator_index,json=validatorIndex,proto3" json:"validator_index,omitempty" cast-type:"github.com/prysmaticlabs/eth2-types.ValidatorIndex"`
-	SyncCommitteeIndices []github_com_prysmaticlabs_eth2_types.CommitteeIndex `protobuf:"varint,2,rep,packed,name=sync_committee_indices,json=syncCommitteeIndices,proto3" json:"sync_committee_indices,omitempty" cast-type:"github.com/prysmaticlabs/eth2-types.CommitteeIndex"`
-	UntilEpoch           github_com_prysmaticlabs_eth2_types.Epoch            `protobuf:"varint,3,opt,name=until_epoch,json=untilEpoch,proto3" json:"until_epoch,omitempty" cast-type:"github.com/prysmaticlabs/eth2-types.Epoch"`
+	ValidatorIndex       github_com_prysmaticlabs_eth2_types.ValidatorIndex `protobuf:"varint,1,opt,name=validator_index,json=validatorIndex,proto3" json:"validator_index,omitempty" cast-type:"github.com/prysmaticlabs/eth2-types.ValidatorIndex"`
+	SyncCommitteeIndices []uint64                                           `protobuf:"varint,2,rep,packed,name=sync_committee_indices,json=syncCommitteeIndices,proto3" json:"sync_committee_indices,omitempty"`
+	UntilEpoch           github_com_prysmaticlabs_eth2_types.Epoch          `protobuf:"varint,3,opt,name=until_epoch,json=untilEpoch,proto3" json:"until_epoch,omitempty" cast-type:"github.com/prysmaticlabs/eth2-types.Epoch"`
 }
 
 func (x *SyncCommitteeSubscription) Reset() {
@@ -400,11 +400,11 @@ func (x *SyncCommitteeSubscription) GetValidatorIndex() github_com_prysmaticlabs
 	return github_com_prysmaticlabs_eth2_types.ValidatorIndex(0)
 }
 
-func (x *SyncCommitteeSubscription) GetSyncCommitteeIndices() []github_com_prysmaticlabs_eth2_types.CommitteeIndex {
+func (x *SyncCommitteeSubscription) GetSyncCommitteeIndices() []uint64 {
 	if x != nil {
 		return x.SyncCommitteeIndices
 	}
-	return []github_com_prysmaticlabs_eth2_types.CommitteeIndex(nil)
+	return nil
 }
 
 func (x *SyncCommitteeSubscription) GetUntilEpoch() github_com_prysmaticlabs_eth2_types.Epoch {
@@ -832,7 +832,7 @@ var file_proto_eth_v2_validator_proto_rawDesc = []byte{
 	0x32, 0x2a, 0x2e, 0x65, 0x74, 0x68, 0x65, 0x72, 0x65, 0x75, 0x6d, 0x2e, 0x65, 0x74, 0x68, 0x2e,
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@@ -840,101 +840,97 @@ var file_proto_eth_v2_validator_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/proto/eth/v2/validator.proto b/proto/eth/v2/validator.proto
index 6eff52584..1612c3748 100644
--- a/proto/eth/v2/validator.proto
+++ b/proto/eth/v2/validator.proto
@@ -73,7 +73,7 @@ message SyncCommitteeSubscription {
   uint64 validator_index = 1 [(ethereum.eth.ext.cast_type) = "github.com/prysmaticlabs/eth2-types.ValidatorIndex"];
 
   // The sync committee indices to be subscribed to.
-  repeated uint64 sync_committee_indices = 2  [(ethereum.eth.ext.cast_type) = "github.com/prysmaticlabs/eth2-types.CommitteeIndex"];
+  repeated uint64 sync_committee_indices = 2;
 
   // The final epoch that the specified validator requires the subscription for.
   uint64 until_epoch = 3 [(ethereum.eth.ext.cast_type) = "github.com/prysmaticlabs/eth2-types.Epoch"];