diff --git a/api/types.go b/api/types.go
index b605bd30..287e04af 100644
--- a/api/types.go
+++ b/api/types.go
@@ -1,5 +1,7 @@
 package api
 
+import "math/big"
+
 type ScriptSig struct {
 	Hex string `json:"hex"`
 	Asm string `json:"asm,omitempty"`
@@ -12,8 +14,8 @@ type Vin struct {
 	N         int       `json:"n"`
 	ScriptSig ScriptSig `json:"scriptSig"`
 	Addr      string    `json:"addr"`
-	ValueSat  int64     `json:"valueSat"`
-	Value     float64   `json:"value"`
+	Value     string    `json:"value"`
+	ValueSat  big.Int   `json:"-"`
 }
 
 type ScriptPubKey struct {
@@ -23,7 +25,8 @@ type ScriptPubKey struct {
 	Type      string   `json:"type,omitempty"`
 }
 type Vout struct {
-	Value        float64      `json:"value"`
+	Value        string       `json:"value"`
+	ValueSat     big.Int      `json:"-"`
 	N            int          `json:"n"`
 	ScriptPubKey ScriptPubKey `json:"scriptPubKey"`
 	SpentTxID    string       `json:"spentTxId,omitempty"`
@@ -32,34 +35,30 @@ type Vout struct {
 }
 
 type Tx struct {
-	Txid          string  `json:"txid"`
-	Version       int32   `json:"version,omitempty"`
-	Locktime      uint32  `json:"locktime,omitempty"`
-	Vin           []Vin   `json:"vin"`
-	Vout          []Vout  `json:"vout"`
-	Blockhash     string  `json:"blockhash,omitempty"`
-	Blockheight   int     `json:"blockheight"`
-	Confirmations uint32  `json:"confirmations"`
-	Time          int64   `json:"time,omitempty"`
-	Blocktime     int64   `json:"blocktime"`
-	ValueOut      float64 `json:"valueOut"`
-	Size          int     `json:"size,omitempty"`
-	ValueIn       float64 `json:"valueIn"`
-	Fees          float64 `json:"fees"`
-	WithSpends    bool    `json:"withSpends,omitempty"`
+	Txid          string `json:"txid"`
+	Version       int32  `json:"version,omitempty"`
+	Locktime      uint32 `json:"locktime,omitempty"`
+	Vin           []Vin  `json:"vin"`
+	Vout          []Vout `json:"vout"`
+	Blockhash     string `json:"blockhash,omitempty"`
+	Blockheight   int    `json:"blockheight"`
+	Confirmations uint32 `json:"confirmations"`
+	Time          int64  `json:"time,omitempty"`
+	Blocktime     int64  `json:"blocktime"`
+	ValueOut      string `json:"valueOut"`
+	Size          int    `json:"size,omitempty"`
+	ValueIn       string `json:"valueIn"`
+	Fees          string `json:"fees"`
+	WithSpends    bool   `json:"withSpends,omitempty"`
 }
 
 type Address struct {
-	AddrStr                 string  `json:"addrStr"`
-	Balance                 float64 `json:"balance"`
-	BalanceSat              int64   `json:"balanceSat"`
-	TotalReceived           float64 `json:"totalReceived"`
-	TotalReceivedSat        int64   `json:"totalReceivedSat"`
-	TotalSent               float64 `json:"totalSent"`
-	TotalSentSat            int64   `json:"totalSentSat"`
-	UnconfirmedBalance      float64 `json:"unconfirmedBalance"`
-	UnconfirmedBalanceSat   int64   `json:"unconfirmedBalanceSat"`
-	UnconfirmedTxApperances int     `json:"unconfirmedTxApperances"`
-	TxApperances            int     `json:"txApperances"`
-	Transactions            []*Tx   `json:"transactions"`
+	AddrStr                 string `json:"addrStr"`
+	Balance                 string `json:"balance"`
+	TotalReceived           string `json:"totalReceived"`
+	TotalSent               string `json:"totalSent"`
+	UnconfirmedBalance      string `json:"unconfirmedBalance"`
+	UnconfirmedTxApperances int    `json:"unconfirmedTxApperances"`
+	TxApperances            int    `json:"txApperances"`
+	Transactions            []*Tx  `json:"transactions"`
 }
diff --git a/api/worker.go b/api/worker.go
index 4ad421d3..ea2870e6 100644
--- a/api/worker.go
+++ b/api/worker.go
@@ -4,6 +4,7 @@ import (
 	"blockbook/bchain"
 	"blockbook/common"
 	"blockbook/db"
+	"math/big"
 
 	"github.com/golang/glog"
 )
@@ -44,7 +45,7 @@ func (w *Worker) GetTransaction(txid string, bestheight uint32, spendingTx bool)
 			return nil, err
 		}
 	}
-	var valIn, valOut, fees float64
+	var valInSat, valOutSat, feesSat big.Int
 	vins := make([]Vin, len(bchainTx.Vin))
 	for i := range bchainTx.Vin {
 		bchainVin := &bchainTx.Vin[i]
@@ -61,9 +62,9 @@ func (w *Worker) GetTransaction(txid string, bestheight uint32, spendingTx bool)
 			}
 			if len(otx.Vout) > int(vin.Vout) {
 				vout := &otx.Vout[vin.Vout]
-				vin.Value = vout.Value
-				valIn += vout.Value
-				vin.ValueSat = int64(vout.Value*1E8 + 0.5)
+				vin.ValueSat = vout.ValueSat
+				vin.Value = w.chainParser.AmountToDecimalString(&vout.ValueSat)
+				valInSat.Add(&valInSat, &vout.ValueSat)
 				if vout.Address != nil {
 					a := vout.Address.String()
 					vin.Addr = a
@@ -76,8 +77,9 @@ func (w *Worker) GetTransaction(txid string, bestheight uint32, spendingTx bool)
 		bchainVout := &bchainTx.Vout[i]
 		vout := &vouts[i]
 		vout.N = i
-		vout.Value = bchainVout.Value
-		valOut += bchainVout.Value
+		vout.ValueSat = bchainVout.ValueSat
+		vout.Value = w.chainParser.AmountToDecimalString(&bchainVout.ValueSat)
+		valOutSat.Add(&valOutSat, &bchainVout.ValueSat)
 		vout.ScriptPubKey.Hex = bchainVout.ScriptPubKey.Hex
 		vout.ScriptPubKey.Addresses = bchainVout.ScriptPubKey.Addresses
 		if spendingTx {
@@ -85,9 +87,9 @@ func (w *Worker) GetTransaction(txid string, bestheight uint32, spendingTx bool)
 		}
 	}
 	// for coinbase transactions valIn is 0
-	fees = valIn - valOut
-	if fees < 0 {
-		fees = 0
+	feesSat.Sub(&valInSat, &valOutSat)
+	if feesSat.Sign() == -1 {
+		feesSat.SetUint64(0)
 	}
 	// for now do not return size, we would have to compute vsize of segwit transactions
 	// size:=len(bchainTx.Hex) / 2
@@ -96,13 +98,13 @@ func (w *Worker) GetTransaction(txid string, bestheight uint32, spendingTx bool)
 		Blockheight:   int(height),
 		Blocktime:     bchainTx.Blocktime,
 		Confirmations: bchainTx.Confirmations,
-		Fees:          fees,
+		Fees:          w.chainParser.AmountToDecimalString(&feesSat),
 		Locktime:      bchainTx.LockTime,
 		WithSpends:    spendingTx,
 		Time:          bchainTx.Time,
 		Txid:          bchainTx.Txid,
-		ValueIn:       valIn,
-		ValueOut:      valOut,
+		ValueIn:       w.chainParser.AmountToDecimalString(&valInSat),
+		ValueOut:      w.chainParser.AmountToDecimalString(&valOutSat),
 		Version:       bchainTx.Version,
 		Vin:           vins,
 		Vout:          vouts,
@@ -131,26 +133,26 @@ func (s *Worker) getAddressTxids(address string, mempool bool) ([]string, error)
 	return txids, nil
 }
 
-func (t *Tx) getAddrVoutValue(addrID string) float64 {
-	var val float64
+func (t *Tx) getAddrVoutValue(addrID string) *big.Int {
+	var val big.Int
 	for _, vout := range t.Vout {
 		for _, a := range vout.ScriptPubKey.Addresses {
 			if a == addrID {
-				val += vout.Value
+				val.Add(&val, &vout.ValueSat)
 			}
 		}
 	}
-	return val
+	return &val
 }
 
-func (t *Tx) getAddrVinValue(addrID string) float64 {
-	var val float64
+func (t *Tx) getAddrVinValue(addrID string) *big.Int {
+	var val big.Int
 	for _, vin := range t.Vin {
 		if vin.Addr == addrID {
-			val += vin.Value
+			val.Add(&val, &vin.ValueSat)
 		}
 	}
-	return val
+	return &val
 }
 
 // UniqueTxidsInReverse reverts the order of transactions (so that newest are first) and removes duplicate transactions
@@ -191,14 +193,14 @@ func (w *Worker) GetAddress(addrID string, page int) (*Address, error) {
 	}
 	txs := make([]*Tx, len(txm)+lc)
 	txi := 0
-	var uBal, bal, totRecv, totSent float64
+	var uBalSat, balSat, totRecvSat, totSentSat big.Int
 	for _, tx := range txm {
 		tx, err := w.GetTransaction(tx, bestheight, false)
 		// mempool transaction may fail
 		if err != nil {
 			glog.Error("GetTransaction ", tx, ": ", err)
 		} else {
-			uBal = tx.getAddrVoutValue(addrID) - tx.getAddrVinValue(addrID)
+			uBalSat.Sub(tx.getAddrVoutValue(addrID), tx.getAddrVinValue(addrID))
 			txs[txi] = tx
 			txi++
 		}
@@ -216,26 +218,23 @@ func (w *Worker) GetAddress(addrID string, page int) (*Address, error) {
 		if err != nil {
 			return nil, err
 		} else {
-			totRecv += tx.getAddrVoutValue(addrID)
-			totSent += tx.getAddrVinValue(addrID)
+			totRecvSat.Add(&totRecvSat, tx.getAddrVoutValue(addrID))
+			totSentSat.Add(&totSentSat, tx.getAddrVinValue(addrID))
 			if i >= from && i < to {
 				txs[txi] = tx
 				txi++
 			}
 		}
 	}
-	bal = totRecv - totSent
+	balSat.Sub(&totRecvSat, &totSentSat)
 	r := &Address{
 		AddrStr:                 addrID,
-		Balance:                 bal,
-		BalanceSat:              int64(bal*1E8 + 0.5),
-		TotalReceived:           totRecv,
-		TotalReceivedSat:        int64(totRecv*1E8 + 0.5),
-		TotalSent:               totSent,
-		TotalSentSat:            int64(totSent*1E8 + 0.5),
+		Balance:                 w.chainParser.AmountToDecimalString(&balSat),
+		TotalReceived:           w.chainParser.AmountToDecimalString(&totRecvSat),
+		TotalSent:               w.chainParser.AmountToDecimalString(&totSentSat),
 		Transactions:            txs[:txi],
 		TxApperances:            len(txc),
-		UnconfirmedBalance:      uBal,
+		UnconfirmedBalance:      w.chainParser.AmountToDecimalString(&uBalSat),
 		UnconfirmedTxApperances: len(txm),
 	}
 	glog.Info(addrID, " finished")
diff --git a/bchain/baseparser.go b/bchain/baseparser.go
index 8f7bc08a..d8d04fef 100644
--- a/bchain/baseparser.go
+++ b/bchain/baseparser.go
@@ -3,6 +3,8 @@ package bchain
 import (
 	"encoding/hex"
 	"encoding/json"
+	"math/big"
+	"strings"
 
 	"github.com/gogo/protobuf/proto"
 	"github.com/juju/errors"
@@ -14,6 +16,7 @@ type AddressFactoryFunc func(string) (Address, error)
 type BaseParser struct {
 	AddressFactory       AddressFactoryFunc
 	BlockAddressesToKeep int
+	AmountDecimalPoint   int
 }
 
 // AddressToOutputScript converts address to ScriptPubKey - currently not implemented
@@ -36,7 +39,47 @@ func (p *BaseParser) ParseTx(b []byte) (*Tx, error) {
 	return nil, errors.New("ParseTx: not implemented")
 }
 
-// ParseTxFromJson parses JSON message containing transaction and returs Tx struct
+const zeros = "0000000000000000000000000000000000000000"
+
+// AmountToBigInt converts amount in json.Number (string) to big.Int
+// it uses string operations to avoid problems with rounding
+func (p *BaseParser) AmountToBigInt(n json.Number) (big.Int, error) {
+	var r big.Int
+	s := string(n)
+	i := strings.IndexByte(s, '.')
+	if i == -1 {
+		s = s + zeros[:p.AmountDecimalPoint]
+	} else {
+		z := p.AmountDecimalPoint - len(s) + i + 1
+		if z > 0 {
+			s = s[:i] + s[i+1:] + zeros[:z]
+		} else {
+			s = s[:i] + s[i+1:len(s)+z]
+		}
+	}
+	if _, ok := r.SetString(s, 10); !ok {
+		return r, errors.New("AmountToBigInt: failed to convert")
+	}
+	return r, nil
+}
+
+// AmountToDecimalString converts amount in big.Int to string with decimal point in the correct place
+func (p *BaseParser) AmountToDecimalString(a *big.Int) string {
+	s := a.String()
+	if len(s) <= p.AmountDecimalPoint {
+		s = zeros[:p.AmountDecimalPoint-len(s)+1] + s
+	}
+	i := len(s) - p.AmountDecimalPoint
+	ad := strings.TrimRight(s[i:], "0")
+	if len(ad) > 0 {
+		s = s[:i] + "." + ad
+	} else {
+		s = s[:i]
+	}
+	return s
+}
+
+// ParseTxFromJson parses JSON message containing transaction and returns Tx struct
 func (p *BaseParser) ParseTxFromJson(msg json.RawMessage) (*Tx, error) {
 	var tx Tx
 	err := json.Unmarshal(msg, &tx)
@@ -44,13 +87,18 @@ func (p *BaseParser) ParseTxFromJson(msg json.RawMessage) (*Tx, error) {
 		return nil, err
 	}
 
-	for i, vout := range tx.Vout {
+	for i := range tx.Vout {
+		vout := &tx.Vout[i]
+		vout.ValueSat, err = p.AmountToBigInt(vout.JsonValue)
+		if err != nil {
+			return nil, err
+		}
 		if len(vout.ScriptPubKey.Addresses) == 1 {
 			a, err := p.AddressFactory(vout.ScriptPubKey.Addresses[0])
 			if err != nil {
 				return nil, err
 			}
-			tx.Vout[i].Address = a
+			vout.Address = a
 		}
 	}
 
@@ -127,7 +175,7 @@ func (p *BaseParser) PackTx(tx *Tx, height uint32, blockTime int64) ([]byte, err
 			Addresses:       vo.ScriptPubKey.Addresses,
 			N:               vo.N,
 			ScriptPubKeyHex: hex,
-			Value:           vo.Value,
+			ValueSat:        vo.ValueSat.Bytes(),
 		}
 	}
 	pt := &ProtoTransaction{
@@ -176,13 +224,15 @@ func (p *BaseParser) UnpackTx(buf []byte) (*Tx, uint32, error) {
 	}
 	vout := make([]Vout, len(pt.Vout))
 	for i, pto := range pt.Vout {
+		var vs big.Int
+		vs.SetBytes(pto.ValueSat)
 		vout[i] = Vout{
 			N: pto.N,
 			ScriptPubKey: ScriptPubKey{
 				Addresses: pto.Addresses,
 				Hex:       hex.EncodeToString(pto.ScriptPubKeyHex),
 			},
-			Value: pto.Value,
+			ValueSat: vs,
 		}
 		if len(pto.Addresses) == 1 {
 			a, err := p.AddressFactory(pto.Addresses[0])
diff --git a/bchain/coins/bch/bcashrpc.go b/bchain/coins/bch/bcashrpc.go
index 68af837a..5dd9b141 100644
--- a/bchain/coins/bch/bcashrpc.go
+++ b/bchain/coins/bch/bcashrpc.go
@@ -5,6 +5,7 @@ import (
 	"blockbook/bchain/coins/btc"
 	"encoding/hex"
 	"encoding/json"
+	"math/big"
 
 	"github.com/cpacia/bchutil"
 	"github.com/golang/glog"
@@ -132,7 +133,7 @@ func (b *BCashRPC) GetBlockFull(hash string) (*bchain.Block, error) {
 }
 
 // EstimateSmartFee returns fee estimation.
-func (b *BCashRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
+func (b *BCashRPC) EstimateSmartFee(blocks int, conservative bool) (big.Int, error) {
 	glog.V(1).Info("rpc: estimatesmartfee ", blocks)
 
 	res := btc.ResEstimateSmartFee{}
@@ -141,13 +142,18 @@ func (b *BCashRPC) EstimateSmartFee(blocks int, conservative bool) (float64, err
 	// conservative param is omitted
 	err := b.Call(&req, &res)
 
+	var r big.Int
 	if err != nil {
-		return 0, err
+		return r, err
 	}
 	if res.Error != nil {
-		return 0, res.Error
+		return r, res.Error
 	}
-	return res.Result.Feerate, nil
+	r, err = b.Parser.AmountToBigInt(res.Result.Feerate)
+	if err != nil {
+		return r, err
+	}
+	return r, nil
 }
 
 func isErrBlockNotFound(err *bchain.RPCError) bool {
diff --git a/bchain/coins/blockchain.go b/bchain/coins/blockchain.go
index b1611161..d9e8eae4 100644
--- a/bchain/coins/blockchain.go
+++ b/bchain/coins/blockchain.go
@@ -17,6 +17,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math/big"
 	"reflect"
 	"time"
 
@@ -172,12 +173,12 @@ func (c *blockChainWithMetrics) GetTransactionForMempool(txid string) (v *bchain
 	return c.b.GetTransactionForMempool(txid)
 }
 
-func (c *blockChainWithMetrics) EstimateSmartFee(blocks int, conservative bool) (v float64, err error) {
+func (c *blockChainWithMetrics) EstimateSmartFee(blocks int, conservative bool) (v big.Int, err error) {
 	defer func(s time.Time) { c.observeRPCLatency("EstimateSmartFee", s, err) }(time.Now())
 	return c.b.EstimateSmartFee(blocks, conservative)
 }
 
-func (c *blockChainWithMetrics) EstimateFee(blocks int) (v float64, err error) {
+func (c *blockChainWithMetrics) EstimateFee(blocks int) (v big.Int, err error) {
 	defer func(s time.Time) { c.observeRPCLatency("EstimateFee", s, err) }(time.Now())
 	return c.b.EstimateFee(blocks)
 }
diff --git a/bchain/coins/btc/bitcoinparser.go b/bchain/coins/btc/bitcoinparser.go
index 861c7f31..767e8d08 100644
--- a/bchain/coins/btc/bitcoinparser.go
+++ b/bchain/coins/btc/bitcoinparser.go
@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"encoding/binary"
 	"encoding/hex"
+	"math/big"
 
 	vlq "github.com/bsm/go-vlq"
 	"github.com/btcsuite/btcd/blockchain"
@@ -30,6 +31,7 @@ func NewBitcoinParser(params *chaincfg.Params, c *Configuration) *BitcoinParser
 		&bchain.BaseParser{
 			AddressFactory:       bchain.NewBaseAddress,
 			BlockAddressesToKeep: c.BlockAddressesToKeep,
+			AmountDecimalPoint:   8,
 		},
 		params,
 		outputScriptToAddresses,
@@ -123,8 +125,10 @@ func (p *BitcoinParser) TxFromMsgTx(t *wire.MsgTx, parseAddresses bool) bchain.T
 			// missing: Asm,
 			// missing: Type,
 		}
+		var vs big.Int
+		vs.SetInt64(out.Value)
 		vout[i] = bchain.Vout{
-			Value:        float64(out.Value) / 1E8,
+			ValueSat:     vs,
 			N:            uint32(i),
 			ScriptPubKey: s,
 		}
diff --git a/bchain/coins/btc/bitcoinrpc.go b/bchain/coins/btc/bitcoinrpc.go
index ac482b8b..8f9fb067 100644
--- a/bchain/coins/btc/bitcoinrpc.go
+++ b/bchain/coins/btc/bitcoinrpc.go
@@ -8,6 +8,7 @@ import (
 	"encoding/json"
 	"io"
 	"io/ioutil"
+	"math/big"
 	"net"
 	"net/http"
 	"time"
@@ -36,18 +37,20 @@ type BitcoinRPC struct {
 }
 
 type Configuration struct {
-	CoinName             string `json:"coin_name"`
-	RPCURL               string `json:"rpcURL"`
-	RPCUser              string `json:"rpcUser"`
-	RPCPass              string `json:"rpcPass"`
-	RPCTimeout           int    `json:"rpcTimeout"`
-	Parse                bool   `json:"parse"`
-	ZeroMQBinding        string `json:"zeroMQBinding"`
-	Subversion           string `json:"subversion"`
-	BlockAddressesToKeep int    `json:"blockAddressesToKeep"`
-	MempoolWorkers       int    `json:"mempoolWorkers"`
-	MempoolSubWorkers    int    `json:"mempoolSubWorkers"`
-	AddressFormat        string `json:"addressFormat"`
+	CoinName                 string `json:"coin_name"`
+	RPCURL                   string `json:"rpcURL"`
+	RPCUser                  string `json:"rpcUser"`
+	RPCPass                  string `json:"rpcPass"`
+	RPCTimeout               int    `json:"rpcTimeout"`
+	Parse                    bool   `json:"parse"`
+	ZeroMQBinding            string `json:"zeroMQBinding"`
+	Subversion               string `json:"subversion"`
+	BlockAddressesToKeep     int    `json:"blockAddressesToKeep"`
+	MempoolWorkers           int    `json:"mempoolWorkers"`
+	MempoolSubWorkers        int    `json:"mempoolSubWorkers"`
+	AddressFormat            string `json:"addressFormat"`
+	SupportsEstimateFee      bool   `json:"supportsEstimateFee"`
+	SupportsEstimateSmartFee bool   `json:"supportsEstimateSmartFee"`
 }
 
 // NewBitcoinRPC returns new BitcoinRPC instance.
@@ -69,6 +72,9 @@ func NewBitcoinRPC(config json.RawMessage, pushHandler func(bchain.NotificationT
 	if c.MempoolSubWorkers < 1 {
 		c.MempoolSubWorkers = 1
 	}
+	// btc supports both calls, other coins overriding BitcoinRPC can change this
+	c.SupportsEstimateFee = true
+	c.SupportsEstimateSmartFee = true
 
 	transport := &http.Transport{
 		Dial:                (&net.Dialer{KeepAlive: 600 * time.Second}).Dial,
@@ -301,8 +307,8 @@ type CmdEstimateSmartFee struct {
 type ResEstimateSmartFee struct {
 	Error  *bchain.RPCError `json:"error"`
 	Result struct {
-		Feerate float64 `json:"feerate"`
-		Blocks  int     `json:"blocks"`
+		Feerate json.Number `json:"feerate"`
+		Blocks  int         `json:"blocks"`
 	} `json:"result"`
 }
 
@@ -317,7 +323,7 @@ type CmdEstimateFee struct {
 
 type ResEstimateFee struct {
 	Error  *bchain.RPCError `json:"error"`
-	Result float64          `json:"result"`
+	Result json.Number      `json:"result"`
 }
 
 // sendrawtransaction
@@ -616,7 +622,12 @@ func (b *BitcoinRPC) GetMempoolTransactions(address string) ([]string, error) {
 }
 
 // EstimateSmartFee returns fee estimation.
-func (b *BitcoinRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
+func (b *BitcoinRPC) EstimateSmartFee(blocks int, conservative bool) (big.Int, error) {
+	// use EstimateFee if EstimateSmartFee is not supported
+	if !b.ChainConfig.SupportsEstimateSmartFee && b.ChainConfig.SupportsEstimateFee {
+		return b.EstimateFee(blocks)
+	}
+
 	glog.V(1).Info("rpc: estimatesmartfee ", blocks)
 
 	res := ResEstimateSmartFee{}
@@ -629,17 +640,27 @@ func (b *BitcoinRPC) EstimateSmartFee(blocks int, conservative bool) (float64, e
 	}
 	err := b.Call(&req, &res)
 
+	var r big.Int
 	if err != nil {
-		return 0, err
+		return r, err
 	}
 	if res.Error != nil {
-		return 0, res.Error
+		return r, res.Error
 	}
-	return res.Result.Feerate, nil
+	r, err = b.Parser.AmountToBigInt(res.Result.Feerate)
+	if err != nil {
+		return r, err
+	}
+	return r, nil
 }
 
 // EstimateFee returns fee estimation.
-func (b *BitcoinRPC) EstimateFee(blocks int) (float64, error) {
+func (b *BitcoinRPC) EstimateFee(blocks int) (big.Int, error) {
+	// use EstimateSmartFee if EstimateFee is not supported
+	if !b.ChainConfig.SupportsEstimateFee && b.ChainConfig.SupportsEstimateSmartFee {
+		return b.EstimateSmartFee(blocks, true)
+	}
+
 	glog.V(1).Info("rpc: estimatefee ", blocks)
 
 	res := ResEstimateFee{}
@@ -647,13 +668,18 @@ func (b *BitcoinRPC) EstimateFee(blocks int) (float64, error) {
 	req.Params.Blocks = blocks
 	err := b.Call(&req, &res)
 
+	var r big.Int
 	if err != nil {
-		return 0, err
+		return r, err
 	}
 	if res.Error != nil {
-		return 0, res.Error
+		return r, res.Error
 	}
-	return res.Result, nil
+	r, err = b.Parser.AmountToBigInt(res.Result)
+	if err != nil {
+		return r, err
+	}
+	return r, nil
 }
 
 // SendRawTransaction sends raw transaction.
diff --git a/bchain/coins/dash/dashrpc.go b/bchain/coins/dash/dashrpc.go
index 4c884f08..dec0ee49 100644
--- a/bchain/coins/dash/dashrpc.go
+++ b/bchain/coins/dash/dashrpc.go
@@ -24,6 +24,7 @@ func NewDashRPC(config json.RawMessage, pushHandler func(bchain.NotificationType
 		b.(*btc.BitcoinRPC),
 	}
 	s.RPCMarshaler = btc.JSONMarshalerV1{}
+	s.ChainConfig.SupportsEstimateSmartFee = false
 
 	return s, nil
 }
@@ -53,8 +54,3 @@ func (b *DashRPC) Initialize() error {
 
 	return nil
 }
-
-// EstimateSmartFee returns fee estimation.
-func (b *DashRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
-	return b.EstimateFee(blocks)
-}
diff --git a/bchain/coins/dogecoin/dogecoinrpc.go b/bchain/coins/dogecoin/dogecoinrpc.go
index d0ebb31c..1fc21618 100644
--- a/bchain/coins/dogecoin/dogecoinrpc.go
+++ b/bchain/coins/dogecoin/dogecoinrpc.go
@@ -24,6 +24,7 @@ func NewDogecoinRPC(config json.RawMessage, pushHandler func(bchain.Notification
 		b.(*btc.BitcoinRPC),
 	}
 	s.RPCMarshaler = btc.JSONMarshalerV1{}
+	s.ChainConfig.SupportsEstimateSmartFee = false
 
 	return s, nil
 }
@@ -69,8 +70,3 @@ func (b *DogecoinRPC) GetBlock(hash string, height uint32) (*bchain.Block, error
 	}
 	return b.GetBlockWithoutHeader(hash, height)
 }
-
-// EstimateSmartFee returns fee estimation.
-func (b *DogecoinRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
-	return b.EstimateFee(blocks)
-}
diff --git a/bchain/coins/eth/ethparser.go b/bchain/coins/eth/ethparser.go
index fe361258..82d08153 100644
--- a/bchain/coins/eth/ethparser.go
+++ b/bchain/coins/eth/ethparser.go
@@ -22,7 +22,11 @@ type EthereumParser struct {
 
 // NewEthereumParser returns new EthereumParser instance
 func NewEthereumParser() *EthereumParser {
-	return &EthereumParser{&bchain.BaseParser{AddressFactory: bchain.NewBaseAddress}}
+	return &EthereumParser{&bchain.BaseParser{
+		AddressFactory:       bchain.NewBaseAddress,
+		BlockAddressesToKeep: 0,
+		AmountDecimalPoint:   18,
+	}}
 }
 
 type rpcTransaction struct {
@@ -86,6 +90,10 @@ func (p *EthereumParser) ethTxToTx(tx *rpcTransaction, blocktime int64, confirma
 	}
 	tx.BlockHash = bh
 	h := hex.EncodeToString(b)
+	vs, err := hexutil.DecodeBig(tx.Value)
+	if err != nil {
+		return nil, err
+	}
 	return &bchain.Tx{
 		Blocktime:     blocktime,
 		Confirmations: confirmations,
@@ -105,8 +113,8 @@ func (p *EthereumParser) ethTxToTx(tx *rpcTransaction, blocktime int64, confirma
 		},
 		Vout: []bchain.Vout{
 			{
-				N: 0, // there is always up to one To address
-				// Value - cannot be set, it does not fit precisely to float64
+				N:        0, // there is always up to one To address
+				ValueSat: *vs,
 				ScriptPubKey: bchain.ScriptPubKey{
 					// Hex
 					Addresses: ta,
@@ -286,9 +294,3 @@ func (p *EthereumParser) UnpackBlockHash(buf []byte) (string, error) {
 func (p *EthereumParser) IsUTXOChain() bool {
 	return false
 }
-
-// KeepBlockAddresses returns number of blocks which are to be kept in blockaddresses column
-// do not use the blockaddresses for eth
-func (p *EthereumParser) KeepBlockAddresses() int {
-	return 0
-}
diff --git a/bchain/coins/eth/ethrpc.go b/bchain/coins/eth/ethrpc.go
index d985e74c..2dda7005 100644
--- a/bchain/coins/eth/ethrpc.go
+++ b/bchain/coins/eth/ethrpc.go
@@ -478,12 +478,12 @@ func (b *EthereumRPC) GetMempool() ([]string, error) {
 }
 
 // EstimateFee returns fee estimation.
-func (b *EthereumRPC) EstimateFee(blocks int) (float64, error) {
+func (b *EthereumRPC) EstimateFee(blocks int) (big.Int, error) {
 	return b.EstimateSmartFee(blocks, true)
 }
 
 // EstimateSmartFee returns fee estimation.
-func (b *EthereumRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
+func (b *EthereumRPC) EstimateSmartFee(blocks int, conservative bool) (big.Int, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), b.timeout)
 	defer cancel()
 	// TODO - what parameters of msg to use to get better estimate, maybe more data from the wallet are needed
@@ -492,10 +492,12 @@ func (b *EthereumRPC) EstimateSmartFee(blocks int, conservative bool) (float64,
 		To: &a,
 	}
 	g, err := b.client.EstimateGas(ctx, msg)
+	var r big.Int
 	if err != nil {
-		return 0, err
+		return r, err
 	}
-	return float64(g), nil
+	r.SetUint64(g)
+	return r, nil
 }
 
 // SendRawTransaction sends raw transaction.
diff --git a/bchain/coins/litecoin/litecoinrpc.go b/bchain/coins/litecoin/litecoinrpc.go
index 0d2ad15f..e7345251 100644
--- a/bchain/coins/litecoin/litecoinrpc.go
+++ b/bchain/coins/litecoin/litecoinrpc.go
@@ -24,6 +24,7 @@ func NewLitecoinRPC(config json.RawMessage, pushHandler func(bchain.Notification
 		b.(*btc.BitcoinRPC),
 	}
 	s.RPCMarshaler = btc.JSONMarshalerV2{}
+	s.ChainConfig.SupportsEstimateFee = false
 
 	return s, nil
 }
@@ -54,8 +55,3 @@ func (b *LitecoinRPC) Initialize() error {
 
 	return nil
 }
-
-// EstimateFee returns fee estimation.
-func (b *LitecoinRPC) EstimateFee(blocks int) (float64, error) {
-	return b.EstimateSmartFee(blocks, true)
-}
diff --git a/bchain/coins/namecoin/namecoinrpc.go b/bchain/coins/namecoin/namecoinrpc.go
index faa14fd3..6ab0b0aa 100644
--- a/bchain/coins/namecoin/namecoinrpc.go
+++ b/bchain/coins/namecoin/namecoinrpc.go
@@ -24,6 +24,7 @@ func NewNamecoinRPC(config json.RawMessage, pushHandler func(bchain.Notification
 		b.(*btc.BitcoinRPC),
 	}
 	s.RPCMarshaler = btc.JSONMarshalerV1{}
+	s.ChainConfig.SupportsEstimateSmartFee = false
 
 	return s, nil
 }
@@ -69,8 +70,3 @@ func (b *NamecoinRPC) GetBlock(hash string, height uint32) (*bchain.Block, error
 	}
 	return b.GetBlockWithoutHeader(hash, height)
 }
-
-// EstimateSmartFee returns fee estimation.
-func (b *NamecoinRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
-	return b.EstimateFee(blocks)
-}
diff --git a/bchain/coins/vertcoin/vertcoinrpc.go b/bchain/coins/vertcoin/vertcoinrpc.go
index 878b9682..f282dc78 100644
--- a/bchain/coins/vertcoin/vertcoinrpc.go
+++ b/bchain/coins/vertcoin/vertcoinrpc.go
@@ -24,6 +24,7 @@ func NewVertcoinRPC(config json.RawMessage, pushHandler func(bchain.Notification
 		b.(*btc.BitcoinRPC),
 	}
 	s.RPCMarshaler = btc.JSONMarshalerV2{}
+	s.ChainConfig.SupportsEstimateFee = false
 
 	return s, nil
 }
@@ -54,8 +55,3 @@ func (b *VertcoinRPC) Initialize() error {
 
 	return nil
 }
-
-// EstimateFee returns fee estimation.
-func (b *VertcoinRPC) EstimateFee(blocks int) (float64, error) {
-	return b.EstimateSmartFee(blocks, true)
-}
diff --git a/bchain/coins/zec/zcashrpc.go b/bchain/coins/zec/zcashrpc.go
index 495fa7af..b2c45fe5 100644
--- a/bchain/coins/zec/zcashrpc.go
+++ b/bchain/coins/zec/zcashrpc.go
@@ -22,6 +22,7 @@ func NewZCashRPC(config json.RawMessage, pushHandler func(bchain.NotificationTyp
 		BitcoinRPC: b.(*btc.BitcoinRPC),
 	}
 	z.RPCMarshaler = btc.JSONMarshalerV1{}
+	z.ChainConfig.SupportsEstimateSmartFee = false
 	return z, nil
 }
 
@@ -114,14 +115,6 @@ func (z *ZCashRPC) GetTransactionForMempool(txid string) (*bchain.Tx, error) {
 	return z.GetTransaction(txid)
 }
 
-// EstimateSmartFee returns fee estimation.
-func (z *ZCashRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
-	glog.V(1).Info("rpc: estimatesmartfee")
-
-	// return z.estimateFee(blocks)
-	return z.EstimateFee(blocks)
-}
-
 // GetMempoolEntry returns mempool data for given transaction
 func (z *ZCashRPC) GetMempoolEntry(txid string) (*bchain.MempoolEntry, error) {
 	return nil, errors.New("GetMempoolEntry: not implemented")
diff --git a/bchain/tx.pb.go b/bchain/tx.pb.go
index dc5a0952..2115993a 100644
--- a/bchain/tx.pb.go
+++ b/bchain/tx.pb.go
@@ -148,7 +148,7 @@ func (m *ProtoTransaction_VinType) GetAddresses() []string {
 }
 
 type ProtoTransaction_VoutType struct {
-	Value           float64  `protobuf:"fixed64,1,opt,name=Value" json:"Value,omitempty"`
+	ValueSat        []byte   `protobuf:"bytes,1,opt,name=ValueSat,proto3" json:"ValueSat,omitempty"`
 	N               uint32   `protobuf:"varint,2,opt,name=N" json:"N,omitempty"`
 	ScriptPubKeyHex []byte   `protobuf:"bytes,3,opt,name=ScriptPubKeyHex,proto3" json:"ScriptPubKeyHex,omitempty"`
 	Addresses       []string `protobuf:"bytes,4,rep,name=Addresses" json:"Addresses,omitempty"`
@@ -159,11 +159,11 @@ func (m *ProtoTransaction_VoutType) String() string            { return proto.Co
 func (*ProtoTransaction_VoutType) ProtoMessage()               {}
 func (*ProtoTransaction_VoutType) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0, 1} }
 
-func (m *ProtoTransaction_VoutType) GetValue() float64 {
+func (m *ProtoTransaction_VoutType) GetValueSat() []byte {
 	if m != nil {
-		return m.Value
+		return m.ValueSat
 	}
-	return 0
+	return nil
 }
 
 func (m *ProtoTransaction_VoutType) GetN() uint32 {
@@ -196,26 +196,26 @@ func init() {
 func init() { proto.RegisterFile("tx.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 330 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x74, 0x92, 0xc1, 0x4e, 0xc2, 0x40,
-	0x10, 0x86, 0xb3, 0xb4, 0x14, 0x18, 0x21, 0x92, 0x89, 0x31, 0x0d, 0xf1, 0x50, 0x39, 0xf5, 0xd4,
-	0x03, 0xc6, 0x07, 0x50, 0x2f, 0x24, 0x1a, 0x42, 0x16, 0xd2, 0x7b, 0x5b, 0x36, 0xb0, 0x11, 0x77,
-	0xb1, 0xdd, 0x1a, 0x78, 0x16, 0x1f, 0xc1, 0x97, 0x34, 0x3b, 0x2d, 0x45, 0x48, 0xbc, 0xed, 0xff,
-	0xef, 0x4c, 0xff, 0x6f, 0xff, 0x14, 0xba, 0x66, 0x1f, 0xed, 0x72, 0x6d, 0x34, 0x7a, 0x69, 0xb6,
-	0x49, 0xa4, 0x1a, 0x7f, 0xbb, 0x30, 0x9c, 0x5b, 0x67, 0x99, 0x27, 0xaa, 0x48, 0x32, 0x23, 0xb5,
-	0x42, 0x04, 0x77, 0xb9, 0x97, 0x2b, 0x9f, 0x05, 0x2c, 0xec, 0x73, 0x3a, 0xe3, 0x10, 0x9c, 0xa9,
-	0xd8, 0xfb, 0x2d, 0xb2, 0xec, 0x11, 0xef, 0xa0, 0xf7, 0xbc, 0xd5, 0xd9, 0xbb, 0x91, 0x1f, 0xc2,
-	0x77, 0x02, 0x16, 0xba, 0xfc, 0x64, 0xe0, 0x08, 0xba, 0x6f, 0xc7, 0x4b, 0x37, 0x60, 0xe1, 0x80,
-	0x37, 0x1a, 0x6f, 0xc1, 0x9b, 0x0a, 0xb9, 0xde, 0x18, 0xbf, 0x4d, 0x37, 0xb5, 0xc2, 0x09, 0x38,
-	0xb1, 0x54, 0xbe, 0x17, 0x38, 0xe1, 0xd5, 0x24, 0x88, 0x2a, 0xc4, 0xe8, 0x12, 0x2f, 0x8a, 0xa5,
-	0x5a, 0x1e, 0x76, 0x82, 0xdb, 0x61, 0x7c, 0x04, 0x37, 0xd6, 0xa5, 0xf1, 0x3b, 0xb4, 0x74, 0xff,
-	0xff, 0x92, 0x2e, 0x0d, 0x6d, 0xd1, 0xf8, 0xe8, 0x87, 0x41, 0xa7, 0xfe, 0x8e, 0x45, 0x7d, 0xd1,
-	0x52, 0xa5, 0x49, 0x21, 0xe8, 0xc9, 0x3d, 0xde, 0xe8, 0xa6, 0x8a, 0xd6, 0x9f, 0x2a, 0xb0, 0x8e,
-	0x74, 0x08, 0x9e, 0xce, 0x38, 0x86, 0xfe, 0x22, 0xcb, 0xe5, 0xce, 0x2c, 0xe4, 0xda, 0xf6, 0xe4,
-	0xd2, 0xfc, 0x99, 0x67, 0x73, 0x16, 0xe2, 0xb3, 0x14, 0x2a, 0x13, 0xf5, 0xc3, 0x1b, 0x6d, 0xcb,
-	0x7c, 0x5a, 0xad, 0x72, 0x51, 0x14, 0xa2, 0xa0, 0x02, 0x7a, 0xfc, 0x64, 0x8c, 0xbe, 0xa0, 0x7b,
-	0xe4, 0xc7, 0x1b, 0x68, 0xc7, 0xc9, 0xb6, 0xac, 0x50, 0x19, 0xaf, 0x04, 0xf6, 0x81, 0xcd, 0x08,
-	0x72, 0xc0, 0xd9, 0x0c, 0x43, 0xb8, 0xae, 0x92, 0xe7, 0x65, 0xfa, 0x2a, 0x0e, 0x16, 0xc8, 0x21,
-	0xa0, 0x4b, 0xfb, 0x3c, 0xd7, 0xbd, 0xc8, 0x4d, 0x3d, 0xfa, 0x59, 0x1e, 0x7e, 0x03, 0x00, 0x00,
-	0xff, 0xff, 0x64, 0x1d, 0x38, 0xac, 0x38, 0x02, 0x00, 0x00,
+	// 331 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x74, 0x52, 0xc1, 0x6e, 0xea, 0x30,
+	0x10, 0x94, 0x89, 0x5f, 0x80, 0x7d, 0xa0, 0x87, 0xf6, 0xf0, 0x14, 0xa1, 0x1e, 0x52, 0x4e, 0x39,
+	0xe5, 0x40, 0xd5, 0x0f, 0x68, 0x7b, 0x41, 0x6a, 0x85, 0x90, 0x83, 0x72, 0x4f, 0x82, 0x05, 0x56,
+	0xa9, 0x4d, 0x13, 0x47, 0x02, 0xa9, 0x3f, 0xd3, 0x73, 0x7f, 0xb2, 0xf2, 0x12, 0x42, 0x41, 0xea,
+	0x6d, 0x67, 0xbc, 0xe3, 0x19, 0x4f, 0x02, 0x3d, 0xbb, 0x8f, 0x77, 0xa5, 0xb1, 0x06, 0xfd, 0xbc,
+	0xd8, 0x64, 0x4a, 0x4f, 0x3e, 0x39, 0x8c, 0x16, 0x8e, 0x59, 0x96, 0x99, 0xae, 0xb2, 0xc2, 0x2a,
+	0xa3, 0x11, 0x81, 0x2f, 0xf7, 0x6a, 0x15, 0xb0, 0x90, 0x45, 0x03, 0x41, 0x33, 0x8e, 0xc0, 0x9b,
+	0xc9, 0x7d, 0xd0, 0x21, 0xca, 0x8d, 0x78, 0x03, 0xfd, 0xc7, 0xad, 0x29, 0x5e, 0xad, 0x7a, 0x93,
+	0x81, 0x17, 0xb2, 0x88, 0x8b, 0x33, 0x81, 0x63, 0xe8, 0xbd, 0x9c, 0x0e, 0x79, 0xc8, 0xa2, 0xa1,
+	0x68, 0x31, 0xfe, 0x07, 0x7f, 0x26, 0xd5, 0x7a, 0x63, 0x83, 0x3f, 0x74, 0xd2, 0x20, 0x9c, 0x82,
+	0x97, 0x2a, 0x1d, 0xf8, 0xa1, 0x17, 0xfd, 0x9d, 0x86, 0xf1, 0x31, 0x62, 0x7c, 0x1d, 0x2f, 0x4e,
+	0x95, 0x5e, 0x1e, 0x76, 0x52, 0xb8, 0x65, 0xbc, 0x07, 0x9e, 0x9a, 0xda, 0x06, 0x5d, 0x12, 0xdd,
+	0xfe, 0x2e, 0x32, 0xb5, 0x25, 0x15, 0xad, 0x8f, 0xbf, 0x18, 0x74, 0x9b, 0x7b, 0x5c, 0xd4, 0x27,
+	0xa3, 0x74, 0x9e, 0x55, 0x92, 0x9e, 0xdc, 0x17, 0x2d, 0x6e, 0xab, 0xe8, 0xfc, 0xa8, 0x02, 0x1b,
+	0x4b, 0x8f, 0xc2, 0xd3, 0x8c, 0x13, 0x18, 0x24, 0x45, 0xa9, 0x76, 0x36, 0x51, 0x6b, 0xd7, 0x13,
+	0xa7, 0xfd, 0x0b, 0xce, 0xf9, 0x24, 0xf2, 0xbd, 0x96, 0xba, 0x90, 0xcd, 0xc3, 0x5b, 0xec, 0xca,
+	0x7c, 0x58, 0xad, 0x4a, 0x59, 0x55, 0xb2, 0xa2, 0x02, 0xfa, 0xe2, 0x4c, 0x8c, 0x3f, 0xa0, 0x77,
+	0xca, 0xef, 0x6e, 0x49, 0xb3, 0x6d, 0x2d, 0x93, 0xcc, 0x36, 0x1f, 0xa8, 0xc5, 0x38, 0x00, 0x36,
+	0xa7, 0xa8, 0x43, 0xc1, 0xe6, 0x18, 0xc1, 0xbf, 0xa3, 0xff, 0xa2, 0xce, 0x9f, 0xe5, 0xc1, 0xc5,
+	0xf2, 0x48, 0x70, 0x4d, 0x5f, 0xba, 0xf3, 0x2b, 0xf7, 0xdc, 0xa7, 0x5f, 0xe6, 0xee, 0x3b, 0x00,
+	0x00, 0xff, 0xff, 0x95, 0x9e, 0x00, 0x7a, 0x3e, 0x02, 0x00, 0x00,
 }
diff --git a/bchain/tx.proto b/bchain/tx.proto
index 731b8bf5..61e06aed 100644
--- a/bchain/tx.proto
+++ b/bchain/tx.proto
@@ -11,7 +11,7 @@ syntax = "proto3";
             repeated string Addresses = 6;
         }
         message VoutType {
-            double Value = 1;
+            bytes ValueSat = 1;
             uint32 N = 2;
             bytes ScriptPubKeyHex = 3;
             repeated string Addresses = 4;
diff --git a/bchain/types.go b/bchain/types.go
index e2aa7276..758f15f9 100644
--- a/bchain/types.go
+++ b/bchain/types.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"math/big"
 )
 
 // errors with specific meaning returned by blockchain rpc
@@ -49,7 +50,8 @@ type Address interface {
 }
 
 type Vout struct {
-	Value        float64      `json:"value"`
+	ValueSat     big.Int
+	JsonValue    json.Number  `json:"value"`
 	N            uint32       `json:"n"`
 	ScriptPubKey ScriptPubKey `json:"scriptPubKey"`
 	Address      Address
@@ -90,9 +92,9 @@ type BlockHeader struct {
 
 type MempoolEntry struct {
 	Size            uint32   `json:"size"`
-	Fee             float64  `json:"fee"`
-	ModifiedFee     float64  `json:"modifiedfee"`
-	Time            float64  `json:"time"`
+	Fee             big.Int  `json:"fee"`
+	ModifiedFee     big.Int  `json:"modifiedfee"`
+	Time            uint64   `json:"time"`
 	Height          uint32   `json:"height"`
 	DescendantCount uint32   `json:"descendantcount"`
 	DescendantSize  uint32   `json:"descendantsize"`
@@ -132,8 +134,8 @@ type BlockChain interface {
 	GetMempool() ([]string, error)
 	GetTransaction(txid string) (*Tx, error)
 	GetTransactionForMempool(txid string) (*Tx, error)
-	EstimateSmartFee(blocks int, conservative bool) (float64, error)
-	EstimateFee(blocks int) (float64, error)
+	EstimateSmartFee(blocks int, conservative bool) (big.Int, error)
+	EstimateFee(blocks int) (big.Int, error)
 	SendRawTransaction(tx string) (string, error)
 	// mempool
 	ResyncMempool(onNewTxAddr func(txid string, addr string)) (int, error)
@@ -145,7 +147,7 @@ type BlockChain interface {
 
 // BlockChainParser defines common interface to parsing and conversions of block chain data
 type BlockChainParser interface {
-	// self description
+	// chain configuration description
 	// UTXO chains need "inputs" column in db, that map transactions to transactions that spend them
 	// non UTXO chains have mapping of address to input and output transactions directly in "outputs" column in db
 	IsUTXOChain() bool
@@ -153,6 +155,11 @@ type BlockChainParser interface {
 	// and used in case of fork
 	// if 0 the blockaddresses column is not used at all (usually non UTXO chains)
 	KeepBlockAddresses() int
+	// AmountToDecimalString converts amount in big.Int to string with decimal point in the correct place
+	AmountToDecimalString(a *big.Int) string
+	// AmountToBigInt converts amount in json.Number (string) to big.Int
+	// it uses string operations to avoid problems with rounding
+	AmountToBigInt(n json.Number) (big.Int, error)
 	// address id conversions
 	GetAddrIDFromVout(output *Vout) ([]byte, error)
 	GetAddrIDFromAddress(address string) ([]byte, error)
diff --git a/server/public.go b/server/public.go
index 54555325..acafd08c 100644
--- a/server/public.go
+++ b/server/public.go
@@ -113,8 +113,10 @@ func formatUnixTime(ut int64) string {
 	return time.Unix(ut, 0).Format(time.RFC1123)
 }
 
-func formatAmount(a float64) string {
-	return strings.TrimRight(strings.TrimRight(fmt.Sprintf("%0.8f", a), "0"), ".")
+// for now return the string as it is
+// in future could be used to do coin specific formatting
+func formatAmount(a string) string {
+	return a
 }
 
 // Run starts the server
diff --git a/server/socketio.go b/server/socketio.go
index 46c0a563..74fbd67b 100644
--- a/server/socketio.go
+++ b/server/socketio.go
@@ -7,6 +7,7 @@ import (
 	"blockbook/db"
 	"encoding/json"
 	"net/http"
+	"strconv"
 	"strings"
 	"time"
 
@@ -236,11 +237,11 @@ type txInputs struct {
 	// ScriptAsm   *string `json:"scriptAsm"`
 	Sequence int64   `json:"sequence"`
 	Address  *string `json:"address"`
-	Satoshis int64   `json:"satoshis"`
+	Satoshis string  `json:"satoshis"`
 }
 
 type txOutputs struct {
-	Satoshis int64   `json:"satoshis"`
+	Satoshis string  `json:"satoshis"`
 	Script   *string `json:"script"`
 	// ScriptAsm   *string `json:"scriptAsm"`
 	SpentTxID   *string `json:"spentTxId,omitempty"`
@@ -267,7 +268,7 @@ type resTx struct {
 
 type addressHistoryItem struct {
 	Addresses     map[string]addressHistoryIndexes `json:"addresses"`
-	Satoshis      int64                            `json:"satoshis"`
+	Satoshis      string                           `json:"satoshis"`
 	Confirmations int                              `json:"confirmations"`
 	Tx            resTx                            `json:"tx"`
 }
@@ -329,7 +330,7 @@ func (s *SocketIoServer) getAddressHistory(addr []string, opts *addrOpts) (res r
 			for _, vout := range tx.Vout {
 				aoh := vout.ScriptPubKey.Hex
 				ao := txOutputs{
-					Satoshis: int64(vout.Value*1E8 + 0.5),
+					Satoshis: vout.ValueSat.String(),
 					Script:   &aoh,
 				}
 				if vout.Address != nil {
@@ -452,6 +453,7 @@ func unmarshalEstimateSmartFee(params []byte) (blocks int, conservative bool, er
 }
 
 type resultEstimateSmartFee struct {
+	// for compatibility reasons use float64
 	Result float64 `json:"result"`
 }
 
@@ -460,7 +462,7 @@ func (s *SocketIoServer) estimateSmartFee(blocks int, conservative bool) (res re
 	if err != nil {
 		return
 	}
-	res.Result = fee
+	res.Result, err = strconv.ParseFloat(s.chainParser.AmountToDecimalString(&fee), 64)
 	return
 }
 
@@ -479,6 +481,7 @@ func unmarshalEstimateFee(params []byte) (blocks int, err error) {
 }
 
 type resultEstimateFee struct {
+	// for compatibility reasons use float64
 	Result float64 `json:"result"`
 }
 
@@ -487,7 +490,7 @@ func (s *SocketIoServer) estimateFee(blocks int) (res resultEstimateFee, err err
 	if err != nil {
 		return
 	}
-	res.Result = fee
+	res.Result, err = strconv.ParseFloat(s.chainParser.AmountToDecimalString(&fee), 64)
 	return
 }
 
@@ -588,7 +591,7 @@ func (s *SocketIoServer) getDetailedTransaction(txid string) (res resultGetDetai
 					a := vout.Address.String()
 					ai.Address = &a
 				}
-				ai.Satoshis = int64(vout.Value*1E8 + 0.5)
+				ai.Satoshis = vout.ValueSat.String()
 			}
 		}
 		hi = append(hi, ai)
@@ -596,7 +599,7 @@ func (s *SocketIoServer) getDetailedTransaction(txid string) (res resultGetDetai
 	for _, vout := range tx.Vout {
 		aos := vout.ScriptPubKey.Hex
 		ao := txOutputs{
-			Satoshis: int64(vout.Value*1E8 + 0.5),
+			Satoshis: vout.ValueSat.String(),
 			Script:   &aos,
 		}
 		if vout.Address != nil {