diff --git a/db/statedb/txprocessors.go b/db/statedb/txprocessors.go
index 7c06459..904e1c2 100644
--- a/db/statedb/txprocessors.go
+++ b/db/statedb/txprocessors.go
@@ -37,6 +37,7 @@ type ProcessTxOutput struct {
 	ExitInfos          []common.ExitInfo
 	CreatedAccounts    []common.Account
 	CoordinatorIdxsMap map[common.TokenID]common.Idx
+	CollectedFees      map[common.TokenID]*big.Int
 }
 
 // ProcessTxs process the given L1Txs & L2Txs applying the needed updates to
@@ -66,6 +67,7 @@ func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs
 			ExitInfos:          nil,
 			CreatedAccounts:    nil,
 			CoordinatorIdxsMap: nil,
+			CollectedFees:      nil,
 		}, nil
 	}
 	exits := make([]processedExit, nTx)
@@ -76,6 +78,14 @@ func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs
 		return nil, err
 	}
 
+	var collectedFees map[common.TokenID]*big.Int
+	if s.typ == TypeSynchronizer {
+		collectedFees = make(map[common.TokenID]*big.Int)
+		for tokenID := range coordIdxsMap {
+			collectedFees[tokenID] = big.NewInt(0)
+		}
+	}
+
 	if s.typ == TypeBatchBuilder {
 		s.zki = common.NewZKInputs(nTx, 24, 32) // TODO this values will be parameters of the function, taken from config file/coordinator call
 		s.zki.OldLastIdx = (s.idx - 1).BigInt()
@@ -138,7 +148,7 @@ func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs
 		}
 	}
 	for i := 0; i < len(l2txs); i++ {
-		exitIdx, exitAccount, newExit, err := s.processL2Tx(coordIdxsMap, exitTree, &l2txs[i])
+		exitIdx, exitAccount, newExit, err := s.processL2Tx(coordIdxsMap, collectedFees, exitTree, &l2txs[i])
 		if err != nil {
 			return nil, err
 		}
@@ -211,6 +221,7 @@ func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs
 			ExitInfos:          exitInfos,
 			CreatedAccounts:    createdAccounts,
 			CoordinatorIdxsMap: coordIdxsMap,
+			CollectedFees:      collectedFees,
 		}, nil
 	}
 
@@ -234,6 +245,7 @@ func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs
 		ExitInfos:          nil,
 		CreatedAccounts:    nil,
 		CoordinatorIdxsMap: coordIdxsMap,
+		CollectedFees:      nil,
 	}, nil
 }
 
@@ -296,7 +308,7 @@ func (s *StateDB) processL1Tx(exitTree *merkletree.MerkleTree, tx *common.L1Tx)
 
 		// coordIdxsMap is 'nil', as at L1Txs there is no L2 fees
 		// 0 for the parameter toIdx, as at L1Tx ToIdx can only be 0 in the Deposit type case.
-		err := s.applyTransfer(nil, tx.Tx(), 0)
+		err := s.applyTransfer(nil, nil, tx.Tx(), 0)
 		if err != nil {
 			log.Error(err)
 			return nil, nil, false, nil, err
@@ -347,7 +359,7 @@ func (s *StateDB) processL1Tx(exitTree *merkletree.MerkleTree, tx *common.L1Tx)
 	case common.TxTypeForceExit:
 		// execute exit flow
 		// coordIdxsMap is 'nil', as at L1Txs there is no L2 fees
-		exitAccount, newExit, err := s.applyExit(nil, exitTree, tx.Tx())
+		exitAccount, newExit, err := s.applyExit(nil, nil, exitTree, tx.Tx())
 		if err != nil {
 			log.Error(err)
 			return nil, nil, false, nil, err
@@ -373,7 +385,8 @@ func (s *StateDB) processL1Tx(exitTree *merkletree.MerkleTree, tx *common.L1Tx)
 // StateDB depending on the transaction Type. It returns the 3 parameters
 // related to the Exit (in case of): Idx, ExitAccount, boolean determining if
 // the Exit created a new Leaf in the ExitTree.
-func (s *StateDB) processL2Tx(coordIdxsMap map[common.TokenID]common.Idx, exitTree *merkletree.MerkleTree, tx *common.PoolL2Tx) (*common.Idx, *common.Account, bool, error) {
+func (s *StateDB) processL2Tx(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
+	exitTree *merkletree.MerkleTree, tx *common.PoolL2Tx) (*common.Idx, *common.Account, bool, error) {
 	var err error
 	// if tx.ToIdx==0, get toIdx by ToEthAddr or ToBJJ
 	if tx.ToIdx == common.Idx(0) && tx.AuxToIdx == common.Idx(0) {
@@ -440,14 +453,14 @@ func (s *StateDB) processL2Tx(coordIdxsMap map[common.TokenID]common.Idx, exitTr
 	case common.TxTypeTransfer, common.TxTypeTransferToEthAddr, common.TxTypeTransferToBJJ:
 		// go to the MT account of sender and receiver, and update
 		// balance & nonce
-		err = s.applyTransfer(coordIdxsMap, tx.Tx(), tx.AuxToIdx)
+		err = s.applyTransfer(coordIdxsMap, collectedFees, tx.Tx(), tx.AuxToIdx)
 		if err != nil {
 			log.Error(err)
 			return nil, nil, false, err
 		}
 	case common.TxTypeExit:
 		// execute exit flow
-		exitAccount, newExit, err := s.applyExit(coordIdxsMap, exitTree, tx.Tx())
+		exitAccount, newExit, err := s.applyExit(coordIdxsMap, collectedFees, exitTree, tx.Tx())
 		if err != nil {
 			log.Error(err)
 			return nil, nil, false, err
@@ -565,7 +578,8 @@ func (s *StateDB) applyDeposit(tx *common.L1Tx, transfer bool) error {
 // tx.ToIdx==0, then toIdx!=0, and will be used the toIdx parameter as Idx of
 // the receiver. This parameter is used when the tx.ToIdx is not specified and
 // the real ToIdx is found trhrough the ToEthAddr or ToBJJ.
-func (s *StateDB) applyTransfer(coordIdxsMap map[common.TokenID]common.Idx, tx common.Tx, auxToIdx common.Idx) error {
+func (s *StateDB) applyTransfer(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
+	tx common.Tx, auxToIdx common.Idx) error {
 	if auxToIdx == common.Idx(0) {
 		auxToIdx = tx.ToIdx
 	}
@@ -600,6 +614,10 @@ func (s *StateDB) applyTransfer(coordIdxsMap map[common.TokenID]common.Idx, tx c
 				log.Error(err)
 				return err
 			}
+			if s.typ == TypeSynchronizer {
+				collected := collectedFees[tx.TokenID]
+				collected.Add(collected, fee)
+			}
 		}
 	}
 
@@ -709,7 +727,8 @@ func (s *StateDB) applyCreateAccountDepositTransfer(tx *common.L1Tx) error {
 
 // It returns the ExitAccount and a boolean determining if the Exit created a
 // new Leaf in the ExitTree.
-func (s *StateDB) applyExit(coordIdxsMap map[common.TokenID]common.Idx, exitTree *merkletree.MerkleTree, tx common.Tx) (*common.Account, bool, error) {
+func (s *StateDB) applyExit(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
+	exitTree *merkletree.MerkleTree, tx common.Tx) (*common.Account, bool, error) {
 	// 0. subtract tx.Amount from current Account in StateMT
 	// add the tx.Amount into the Account (tx.FromIdx) in the ExitMT
 	acc, err := s.GetAccount(tx.FromIdx)
@@ -734,6 +753,10 @@ func (s *StateDB) applyExit(coordIdxsMap map[common.TokenID]common.Idx, exitTree
 				log.Error(err)
 				return nil, false, err
 			}
+			if s.typ == TypeSynchronizer {
+				collected := collectedFees[tx.TokenID]
+				collected.Add(collected, fee)
+			}
 		}
 	}
 
diff --git a/db/statedb/txprocessors_test.go b/db/statedb/txprocessors_test.go
index 70869c0..8a78e0e 100644
--- a/db/statedb/txprocessors_test.go
+++ b/db/statedb/txprocessors_test.go
@@ -13,6 +13,8 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+// TODO: Test CollectedFees output
+
 func TestProcessTxsSynchronizer(t *testing.T) {
 	// TODO once TTGL is updated, use the blockchain L2Tx (not PoolL2Tx) for
 	// the Synchronizer tests
diff --git a/synchronizer/synchronizer.go b/synchronizer/synchronizer.go
index c0f9498..a2ed3bf 100644
--- a/synchronizer/synchronizer.go
+++ b/synchronizer/synchronizer.go
@@ -296,7 +296,6 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 	blockNum := ethBlock.EthBlockNum
 	var rollupData = newRollupData()
 	// var forgeL1TxsNum int64
-	var numAccounts int
 
 	// Get rollup events in the block, and make sure the block hash matches
 	// the expected one.
@@ -393,20 +392,19 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 		// processed.
 		poolL2Txs := common.L2TxsToPoolL2Txs(forgeBatchArgs.L2TxsData) // TODO: This is a big ugly, find a better way
 
-		// TODO: Get CollectedFees from ProcessTxs()
-		// TODO: Pass forgeBatchArgs.FeeIdxCoordinator to ProcessTxs()
-		// ProcessTxs updates poolL2Txs adding: Nonce, TokenID
-		ptOut, err := s.stateDB.ProcessTxs([]common.Idx{}, l1UserTxs, batchData.L1CoordinatorTxs, poolL2Txs)
+		// ProcessTxs updates poolL2Txs adding: Nonce (and also TokenID, but we don't use it).
+		processTxsOut, err := s.stateDB.ProcessTxs(forgeBatchArgs.FeeIdxCoordinator, l1UserTxs,
+			batchData.L1CoordinatorTxs, poolL2Txs)
 		if err != nil {
 			return nil, err
 		}
 
 		// Set batchNum in exits
-		for i := range ptOut.ExitInfos {
-			exit := &ptOut.ExitInfos[i]
+		for i := range processTxsOut.ExitInfos {
+			exit := &processTxsOut.ExitInfos[i]
 			exit.BatchNum = batchNum
 		}
-		batchData.ExitTree = ptOut.ExitInfos
+		batchData.ExitTree = processTxsOut.ExitInfos
 
 		l2Txs, err := common.PoolL2TxsToL2Txs(poolL2Txs) // TODO: This is a big uggly, find a better way
 		if err != nil {
@@ -427,11 +425,11 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 			position++
 		}
 
-		for i := range ptOut.CreatedAccounts {
-			createdAccount := &ptOut.CreatedAccounts[i]
+		for i := range processTxsOut.CreatedAccounts {
+			createdAccount := &processTxsOut.CreatedAccounts[i]
 			createdAccount.BatchNum = batchNum
 		}
-		batchData.CreatedAccounts = ptOut.CreatedAccounts
+		batchData.CreatedAccounts = processTxsOut.CreatedAccounts
 
 		slotNum := int64(0)
 		if ethBlock.EthBlockNum >= s.auctionConstants.GenesisBlockNum {
@@ -441,15 +439,15 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 
 		// Get Batch information
 		batch := common.Batch{
-			BatchNum:    batchNum,
-			EthBlockNum: blockNum,
-			ForgerAddr:  *sender,
-			// CollectedFees: , TODO: Clarify where to get them if they are still needed
-			StateRoot:   forgeBatchArgs.NewStRoot,
-			NumAccounts: numAccounts, // TODO: Calculate this value
-			LastIdx:     forgeBatchArgs.NewLastIdx,
-			ExitRoot:    forgeBatchArgs.NewExitRoot,
-			SlotNum:     slotNum,
+			BatchNum:      batchNum,
+			EthBlockNum:   blockNum,
+			ForgerAddr:    *sender,
+			CollectedFees: processTxsOut.CollectedFees,
+			StateRoot:     forgeBatchArgs.NewStRoot,
+			NumAccounts:   len(batchData.CreatedAccounts),
+			LastIdx:       forgeBatchArgs.NewLastIdx,
+			ExitRoot:      forgeBatchArgs.NewExitRoot,
+			SlotNum:       slotNum,
 		}
 		nextForgeL1TxsNumCpy := nextForgeL1TxsNum
 		if forgeBatchArgs.L1Batch {
@@ -471,7 +469,6 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 
 		if consts, err := s.ethClient.EthERC20Consts(evtAddToken.TokenAddress); err != nil {
 			log.Warnw("Error retreiving ERC20 token constants", "addr", evtAddToken.TokenAddress)
-			// TODO: Add external information consulting SC about it using Address
 			token.Name = "ERC20_ETH_ERROR"
 			token.Symbol = "ERROR"
 			token.Decimals = 1
diff --git a/synchronizer/synchronizer_test.go b/synchronizer/synchronizer_test.go
index 8ff1a0b..313251f 100644
--- a/synchronizer/synchronizer_test.go
+++ b/synchronizer/synchronizer_test.go
@@ -123,6 +123,7 @@ func checkSyncBlock(t *testing.T, s *Synchronizer, blockNum int, block, syncBloc
 		// has a TotalFeesUSD inserted by the HistoryDB
 		batch.Batch.TotalFeesUSD = syncBatch.Batch.TotalFeesUSD
 		batch.CreatedAccounts = syncBatch.CreatedAccounts // til doesn't output CreatedAccounts
+		batch.Batch.NumAccounts = len(batch.CreatedAccounts)
 
 		// Test field by field to facilitate debugging of errors
 		assert.Equal(t, batch.L1CoordinatorTxs, syncBatch.L1CoordinatorTxs)
@@ -135,6 +136,12 @@ func checkSyncBlock(t *testing.T, s *Synchronizer, blockNum int, block, syncBloc
 			assert.Equal(t, exit.Balance, syncBatch.ExitTree[j].Balance)
 			*exit = syncBatch.ExitTree[j]
 		}
+		// We are collecting fees after blockNum=2 in 2 idxs
+		if block.Block.EthBlockNum > 2 {
+			// fmt.Printf("DBG collectedFees: %+v\n", syncBatch.Batch.CollectedFees)
+			assert.Equal(t, 2, len(syncBatch.Batch.CollectedFees))
+		}
+		batch.Batch.CollectedFees = syncBatch.Batch.CollectedFees
 		assert.Equal(t, batch.Batch, syncBatch.Batch)
 		assert.Equal(t, batch, syncBatch)
 		assert.Equal(t, &batch.Batch, dbBatch) //nolint:gosec
@@ -254,10 +261,6 @@ func TestSync(t *testing.T) {
 	// Generate blockchain and smart contract data, and fill the test smart contracts
 	//
 
-	// TODO: Test CreateAccountDepositTransfer
-	// TODO: Test ForceTransfer
-	// TODO: Test ForceExit
-
 	// Generate blockchain data with til
 	set1 := `
 		Type: Blockchain
@@ -266,23 +269,28 @@ func TestSync(t *testing.T) {
 		AddToken(2)
 		AddToken(3)
 
-		CreateAccountDeposit(1) C: 20 // Idx=256+2=258
-		CreateAccountDeposit(2) A: 20 // Idx=256+3=259
-		CreateAccountDeposit(1) D: 5  // Idx=256+4=260
-		CreateAccountDeposit(2) B: 5  // Idx=256+5=261
-		CreateAccountDeposit(2) C: 5  // Idx=256+6=262
+		CreateAccountDeposit(1) C: 2000 // Idx=256+2=258
+		CreateAccountDeposit(2) A: 2000 // Idx=256+3=259
+		CreateAccountDeposit(1) D: 500  // Idx=256+4=260
+		CreateAccountDeposit(2) B: 500  // Idx=256+5=261
+		CreateAccountDeposit(2) C: 500  // Idx=256+6=262
 
 		CreateAccountCoordinator(1) A // Idx=256+0=256
 		CreateAccountCoordinator(1) B // Idx=256+1=257
 
-		> batchL1 // forge L1UserTxs{nil}, freeze defined L1UserTxs
-		> batchL1 // forge defined L1UserTxs, freeze L1UserTxs{nil}
+		> batchL1 // forge L1UserTxs{nil}, freeze defined L1UserTxs{5}
+		> batchL1 // forge defined L1UserTxs{5}, freeze L1UserTxs{nil}
 		> block // blockNum=2
 
-		Transfer(1) C-A: 10 (10)
-		Exit(1) D: 3 (5)
+		CreateAccountDepositTransfer(1) E-A: 1000, 200 // Idx=256+7=263
+		ForceExit(1) A: 100
+		ForceTransfer(1) A-D: 100
+
+		Transfer(1) C-A: 100 (200)
+		Exit(1) D: 30 (200)
 
-		> batch
+		> batchL1 // forge L1UserTxs{nil}, freeze defined L1UserTxs{2}
+		> batchL1 // forge L1UserTxs{2}, freeze defined L1UserTxs{nil}
 		> block // blockNum=3
 
 	`
@@ -301,7 +309,8 @@ func TestSync(t *testing.T) {
 	// blocks 1 (blockNum=3)
 	i = 1
 	require.Equal(t, 3, int(blocks[i].Block.EthBlockNum))
-	require.Equal(t, 1, len(blocks[i].Batches))
+	require.Equal(t, 3, len(blocks[i].L1UserTxs))
+	require.Equal(t, 2, len(blocks[i].Batches))
 	require.Equal(t, 2, len(blocks[i].Batches[0].L2Txs))
 
 	// Generate extra required data
@@ -330,6 +339,12 @@ func TestSync(t *testing.T) {
 			require.Nil(t, err)
 		}
 		client.CtlSetAddr(bootCoordAddr)
+		feeIdxCoordinator := []common.Idx{}
+		if block.Block.EthBlockNum > 2 {
+			// After blockNum=2 we have some accounts, use them as
+			// coordinator owned to receive fees.
+			feeIdxCoordinator = []common.Idx{common.Idx(256), common.Idx(259)}
+		}
 		for _, batch := range block.Batches {
 			_, err := client.RollupForgeBatch(&eth.RollupForgeBatchArgs{
 				NewLastIdx:            batch.Batch.LastIdx,
@@ -338,7 +353,7 @@ func TestSync(t *testing.T) {
 				L1CoordinatorTxs:      batch.L1CoordinatorTxs,
 				L1CoordinatorTxsAuths: [][]byte{}, // Intentionally empty
 				L2TxsData:             batch.L2Txs,
-				FeeIdxCoordinator:     []common.Idx{}, // TODO
+				FeeIdxCoordinator:     feeIdxCoordinator,
 				// Circuit selector
 				VerifierIdx: 0, // Intentionally empty
 				L1Batch:     batch.L1Batch,
diff --git a/test/til/txs.go b/test/til/txs.go
index d404421..c7a6e6d 100644
--- a/test/til/txs.go
+++ b/test/til/txs.go
@@ -257,6 +257,7 @@ func (tc *Context) GenerateBlocks(set string) ([]common.BlockData, error) {
 			}
 			tx := common.L2Tx{
 				ToIdx:       common.Idx(1), // as is an Exit
+				Fee:         common.FeeSelector(inst.fee),
 				Amount:      big.NewInt(int64(inst.amount)),
 				Type:        common.TxTypeExit,
 				EthBlockNum: tc.blockNum,