diff --git a/cmd/chain-ethgas/main.go b/cmd/chain-ethgas/main.go
new file mode 100644
index 0000000..2ba19ed
--- /dev/null
+++ b/cmd/chain-ethgas/main.go
@@ -0,0 +1,98 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/0xsequence/ethkit/ethgas"
+	"github.com/0xsequence/ethkit/ethmonitor"
+	"github.com/0xsequence/ethkit/ethrpc"
+	"github.com/0xsequence/ethkit/util"
+	"github.com/goware/logger"
+)
+
+var ETH_NODE_URL = "http://localhost:8545"
+var ETH_NODE_WSS_URL = ""
+
+func init() {
+	testConfig, err := util.ReadTestConfig("../../ethkit-test.json")
+	if err != nil {
+		panic(err)
+	}
+
+	if testConfig["POLYGON_MAINNET_URL"] != "" {
+		ETH_NODE_URL = testConfig["POLYGON_MAINNET_URL"]
+		ETH_NODE_WSS_URL = testConfig["POLYGON_MAINNET_WSS_URL"]
+	}
+	// if testConfig["MAINNET_URL"] != "" {
+	// 	ETH_NODE_URL = testConfig["MAINNET_URL"]
+	// 	ETH_NODE_WSS_URL = testConfig["MAINNET_WSS_URL"]
+	// }
+
+	// ETH_NODE_URL = ""
+	// ETH_NODE_WSS_URL = ""
+}
+
+func main() {
+	fmt.Println("chain-ethgas start")
+
+	// Provider
+	provider, err := ethrpc.NewProvider(ETH_NODE_URL, ethrpc.WithStreaming(ETH_NODE_WSS_URL))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Monitor options
+	monitorOptions := ethmonitor.DefaultOptions
+	monitorOptions.PollingInterval = time.Duration(1000 * time.Millisecond)
+	// monitorOptions.DebugLogging = true
+	monitorOptions.WithLogs = true
+	monitorOptions.BlockRetentionLimit = 400
+	monitorOptions.StartBlockNumber = nil // track the head
+
+	// ...
+	monitor, err := ethmonitor.NewMonitor(provider, monitorOptions)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	ctx := context.Background()
+
+	go func() {
+		err = monitor.Run(ctx)
+		if err != nil {
+			panic(err)
+		}
+	}()
+	defer monitor.Stop()
+
+	logger := logger.NewLogger(logger.LogLevel_INFO)
+
+	gasGague, err := ethgas.NewGasGauge(logger, monitor, 1, false)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	go func() {
+		err := gasGague.Run(ctx)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}()
+	defer gasGague.Stop()
+
+	sub := gasGague.Subscribe()
+	defer sub.Unsubscribe()
+
+	for {
+		select {
+		case <-sub.Blocks():
+			prices := gasGague.SuggestedGasPrice()
+			bids := gasGague.SuggestedGasPriceBid()
+			fmt.Println(prices.BlockNum, prices.BlockTime, prices.Instant, prices.Fast, prices.Standard, prices.Slow)
+			fmt.Println(bids.BlockNum, bids.BlockTime, bids.Instant, bids.Fast, bids.Standard, bids.Slow)
+		}
+	}
+}
diff --git a/ethrpc/ethrpc_test.go b/ethrpc/ethrpc_test.go
index 2c3b884..f2dd32c 100644
--- a/ethrpc/ethrpc_test.go
+++ b/ethrpc/ethrpc_test.go
@@ -305,3 +305,21 @@ func TestDebugTraceTransaction(t *testing.T) {
 // 	require.NotNil(t, block)
 // 	require.Equal(t, uint64(1_000_000), block.NumberU64())
 // }
+
+func TestFetchBlockWithInvalidVRS(t *testing.T) {
+	url := "https://rpc.telos.net"
+	// url := "https://node.mainnet.etherlink.com"
+
+	p, err := ethrpc.NewProvider(url)
+	require.NoError(t, err)
+
+	block, err := p.BlockByNumber(context.Background(), big.NewInt(373117692))
+	require.NoError(t, err)
+	require.NotNil(t, block)
+
+	for _, tx := range block.Transactions() {
+		require.Equal(t, uint8(0), tx.Type())
+		require.Equal(t, big.NewInt(0), tx.GasFeeCap())
+		require.Equal(t, big.NewInt(0), tx.GasPrice())
+	}
+}
diff --git a/ethrpc/unmarshal.go b/ethrpc/unmarshal.go
index b88b579..0786bdc 100644
--- a/ethrpc/unmarshal.go
+++ b/ethrpc/unmarshal.go
@@ -47,6 +47,18 @@ func (tx *rpcTransaction) UnmarshalJSON(msg []byte) error {
 		// we set internal flag to check if txn has invalid VRS signature
 		if err == types.ErrInvalidSig {
 			tx.txVRSInvalid = true
+
+			// reset vrs to 0x0 and try again. we perform validation in the caller
+			msg, err = resetVRS(msg)
+			if err != nil {
+				return err
+			}
+
+			// in case of any other error, return the error
+			err = json.Unmarshal(msg, &tx.tx)
+			if err != nil {
+				return err
+			}
 		}
 	}
 
@@ -103,7 +115,7 @@ func IntoBlock(raw json.RawMessage, ret **types.Block, strictness StrictnessLeve
 		}
 
 		if strictness >= StrictnessLevel_Semi && tx.txVRSInvalid {
-			return fmt.Errorf("invalid transaction v, r, s")
+			return types.ErrInvalidSig
 		}
 
 		if tx.txExtraInfo.TxType != "" {
@@ -160,7 +172,7 @@ func IntoTransactionWithPending(raw json.RawMessage, tx **types.Transaction, pen
 
 	if strictness >= StrictnessLevel_Semi {
 		if body.txVRSInvalid {
-			return fmt.Errorf("invalid transaction v, r, s")
+			return types.ErrInvalidSig
 		}
 		if _, r, _ := body.tx.RawSignatureValues(); r == nil {
 			return fmt.Errorf("server returned transaction without signature")
@@ -217,3 +229,19 @@ func (s *senderFromServer) Hash(tx *types.Transaction) common.Hash {
 func (s *senderFromServer) SignatureValues(tx *types.Transaction, sig []byte) (R, S, V *big.Int, err error) {
 	panic("can't sign with senderFromServer")
 }
+
+func resetVRS(msg []byte) ([]byte, error) {
+	var m map[string]interface{}
+	err := json.Unmarshal(msg, &m)
+	if err != nil {
+		return nil, err
+	}
+	m["v"] = "0x0"
+	m["r"] = "0x0"
+	m["s"] = "0x0"
+	out, err := json.Marshal(m)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}