core, eth, internal, les: RPC methods and fields for EIP 1559 (#22964)

* internal/ethapi: add baseFee to RPCMarshalHeader

* internal/ethapi: add FeeCap, Tip and correct GasPrice to EIP-1559 RPCTransaction results

* core,eth,les,internal: add support for tip estimation in gas price oracle

* internal/ethapi,eth/gasprice: don't suggest tip larger than fee cap

* core/types,internal: use correct eip1559 terminology for json marshalling

* eth, internal/ethapi: fix rebase problems

* internal/ethapi: fix rpc name of basefee

* internal/ethapi: address review concerns

* core, eth, internal, les: simplify gasprice oracle (#25)

* core, eth, internal, les: simplify gasprice oracle

* eth/gasprice: fix typo

* internal/ethapi: minor tweak in tx args

* internal/ethapi: calculate basefee for pending block

* internal/ethapi: fix panic

* internal/ethapi, eth/tracers: simplify txargs ToMessage

* internal/ethapi: remove unused param

* core, eth, internal: fix regressions wrt effective gas price in the evm

* eth/gasprice: drop weird debug println

* internal/jsre/deps: hack in 1559 gas conversions into embedded web3

* internal/jsre/deps: hack basFee to decimal conversion

* internal/ethapi: init feecap and tipcap for legacy txs too

* eth, graphql, internal, les: fix gas price suggestion on all combos

* internal/jsre/deps: handle decimal tipcap and feecap

* eth, internal: minor review fixes

* graphql, internal: export max fee cap RPC endpoint

* internal/ethapi: fix crash in transaction_args

* internal/ethapi: minor refactor to make the code safer

Co-authored-by: Ryan Schneider <ryanleeschneider@gmail.com>
Co-authored-by: lightclient@protonmail.com <lightclient@protonmail.com>
Co-authored-by: gary rong <garyrong0905@gmail.com>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>

core/chain_makers.go

@@ -252,7 +252,6 @@ func makeHeader(chain consensus.ChainReader, parent *types.Block, state *state.S
 	} else {
 		time = parent.Time() + 10 // block time is fixed at 10 seconds
 	}
-
 	header := &types.Header{
 		Root:       state.IntermediateRoot(chain.Config().IsEIP158(parent.Number())),
 		ParentHash: parent.Hash(),
@@ -267,11 +266,14 @@ func makeHeader(chain consensus.ChainReader, parent *types.Block, state *state.S
 		Number:   new(big.Int).Add(parent.Number(), common.Big1),
 		Time:     time,
 	}
-
+	if chain.Config().IsLondon(header.Number) {
-	if chain.Config().IsLondon(parent.Number()) {
 		header.BaseFee = misc.CalcBaseFee(chain.Config(), parent.Header())
+		parentGasLimit := parent.GasLimit()
+		if !chain.Config().IsLondon(parent.Number()) {
+			parentGasLimit = parent.GasLimit() * params.ElasticityMultiplier
+		}
+		header.GasLimit = CalcGasLimit1559(parentGasLimit, parentGasLimit)
 	}
-
 	return header
 }
 

core/types/block.go

@@ -84,7 +84,7 @@ type Header struct {
 	Nonce       BlockNonce     `json:"nonce"`
 
 	// BaseFee was added by EIP-1559 and is ignored in legacy headers.
-	BaseFee *big.Int `json:"baseFee" rlp:"optional"`
+	BaseFee *big.Int `json:"baseFeePerGas" rlp:"optional"`
 }
 
 // field type overrides for gencodec

core/types/gen_header_json.go

@@ -31,6 +31,7 @@ func (h Header) MarshalJSON() ([]byte, error) {
 		Extra       hexutil.Bytes  `json:"extraData"        gencodec:"required"`
 		MixDigest   common.Hash    `json:"mixHash"`
 		Nonce       BlockNonce     `json:"nonce"`
+		BaseFee     *hexutil.Big   `json:"baseFeePerGas" rlp:"optional"`
 		Hash        common.Hash    `json:"hash"`
 	}
 	var enc Header
@@ -49,6 +50,7 @@ func (h Header) MarshalJSON() ([]byte, error) {
 	enc.Extra = h.Extra
 	enc.MixDigest = h.MixDigest
 	enc.Nonce = h.Nonce
+	enc.BaseFee = (*hexutil.Big)(h.BaseFee)
 	enc.Hash = h.Hash()
 	return json.Marshal(&enc)
 }
@@ -71,6 +73,7 @@ func (h *Header) UnmarshalJSON(input []byte) error {
 		Extra       *hexutil.Bytes  `json:"extraData"        gencodec:"required"`
 		MixDigest   *common.Hash    `json:"mixHash"`
 		Nonce       *BlockNonce     `json:"nonce"`
+		BaseFee     *hexutil.Big    `json:"baseFeePerGas" rlp:"optional"`
 	}
 	var dec Header
 	if err := json.Unmarshal(input, &dec); err != nil {
@@ -134,5 +137,8 @@ func (h *Header) UnmarshalJSON(input []byte) error {
 	if dec.Nonce != nil {
 		h.Nonce = *dec.Nonce
 	}
+	if dec.BaseFee != nil {
+		h.BaseFee = (*big.Int)(dec.BaseFee)
+	}
 	return nil
 }

core/types/transaction.go

@@ -604,12 +604,10 @@ func (tx *Transaction) AsMessage(s Signer, baseFee *big.Int) (Message, error) {
 		accessList: tx.AccessList(),
 		checkNonce: true,
 	}
-
 	// If baseFee provided, set gasPrice to effectiveGasPrice.
 	if baseFee != nil {
 		msg.gasPrice = math.BigMin(msg.gasPrice.Add(msg.tip, baseFee), msg.feeCap)
 	}
-
 	var err error
 	msg.from, err = Sender(s, tx)
 	return msg, err

core/types/transaction_marshalling.go

@@ -32,8 +32,6 @@ type txJSON struct {
 	// Common transaction fields:
 	Nonce                *hexutil.Uint64 `json:"nonce"`
 	GasPrice             *hexutil.Big    `json:"gasPrice"`
-	FeeCap               *hexutil.Big    `json:"feeCap"`
-	Tip                  *hexutil.Big    `json:"tip"`
 	MaxPriorityFeePerGas *hexutil.Big    `json:"maxPriorityFeePerGas"`
 	MaxFeePerGas         *hexutil.Big    `json:"maxFeePerGas"`
 	Gas                  *hexutil.Uint64 `json:"gas"`
@@ -88,8 +86,8 @@ func (t *Transaction) MarshalJSON() ([]byte, error) {
 		enc.AccessList = &tx.AccessList
 		enc.Nonce = (*hexutil.Uint64)(&tx.Nonce)
 		enc.Gas = (*hexutil.Uint64)(&tx.Gas)
-		enc.FeeCap = (*hexutil.Big)(tx.FeeCap)
+		enc.MaxFeePerGas = (*hexutil.Big)(tx.FeeCap)
-		enc.Tip = (*hexutil.Big)(tx.Tip)
+		enc.MaxPriorityFeePerGas = (*hexutil.Big)(tx.Tip)
 		enc.Value = (*hexutil.Big)(tx.Value)
 		enc.Data = (*hexutil.Bytes)(&tx.Data)
 		enc.To = t.To()
@@ -226,26 +224,14 @@ func (t *Transaction) UnmarshalJSON(input []byte) error {
 			return errors.New("missing required field 'nonce' in transaction")
 		}
 		itx.Nonce = uint64(*dec.Nonce)
-		switch {
+		if dec.MaxPriorityFeePerGas == nil {
-		case dec.Tip == nil && dec.MaxPriorityFeePerGas == nil:
+			return errors.New("missing required field 'maxPriorityFeePerGas' for txdata")
-			return errors.New("at least one of 'tip' or 'maxPriorityFeePerGas' must be defined")
+		}
-		case dec.Tip != nil && dec.MaxPriorityFeePerGas != nil:
-			return errors.New("only one of 'tip' or 'maxPriorityFeePerGas' may be defined")
-		case dec.Tip != nil && dec.MaxPriorityFeePerGas == nil:
-			itx.Tip = (*big.Int)(dec.Tip)
-		case dec.Tip == nil && dec.MaxPriorityFeePerGas != nil:
 		itx.Tip = (*big.Int)(dec.MaxPriorityFeePerGas)
+		if dec.MaxFeePerGas == nil {
+			return errors.New("missing required field 'maxFeePerGas' for txdata")
 		}
-		switch {
-		case dec.FeeCap == nil && dec.MaxFeePerGas == nil:
-			return errors.New("at least one of 'feeCap' or 'maxFeePerGas' must be defined")
-		case dec.FeeCap != nil && dec.MaxFeePerGas != nil:
-			return errors.New("only one of 'feeCap' or 'maxFeePerGas' may be defined")
-		case dec.FeeCap != nil && dec.MaxFeePerGas == nil:
-			itx.FeeCap = (*big.Int)(dec.FeeCap)
-		case dec.FeeCap == nil && dec.MaxFeePerGas != nil:
 		itx.FeeCap = (*big.Int)(dec.MaxFeePerGas)
-		}
 		if dec.Gas == nil {
 			return errors.New("missing required field 'gas' for txdata")
 		}

eth/api_backend.go

@@ -275,8 +275,8 @@ func (b *EthAPIBackend) Downloader() *downloader.Downloader {
 	return b.eth.Downloader()
 }
 
-func (b *EthAPIBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
+func (b *EthAPIBackend) SuggestGasTipCap(ctx context.Context) (*big.Int, error) {
-	return b.gpo.SuggestPrice(ctx)
+	return b.gpo.SuggestTipCap(ctx)
 }
 
 func (b *EthAPIBackend) ChainDb() ethdb.Database {

eth/gasprice/gasprice.go

@@ -31,8 +31,10 @@ import (
 
 const sampleNumber = 3 // Number of transactions sampled in a block
 
-var DefaultMaxPrice = big.NewInt(500 * params.GWei)
+var (
-var DefaultIgnorePrice = big.NewInt(2 * params.Wei)
+	DefaultMaxPrice    = big.NewInt(500 * params.GWei)
+	DefaultIgnorePrice = big.NewInt(2 * params.Wei)
+)
 
 type Config struct {
 	Blocks      int
@@ -103,9 +105,13 @@ func NewOracle(backend OracleBackend, params Config) *Oracle {
 	}
 }
 
-// SuggestPrice returns a gasprice so that newly created transaction can
+// SuggestTipCap returns a tip cap so that newly created transaction can have a
-// have a very high chance to be included in the following blocks.
+// very high chance to be included in the following blocks.
-func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
+//
+// Note, for legacy transactions and the legacy eth_gasPrice RPC call, it will be
+// necessary to add the basefee to the returned number to fall back to the legacy
+// behavior.
+func (gpo *Oracle) SuggestTipCap(ctx context.Context) (*big.Int, error) {
 	head, _ := gpo.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
 	headHash := head.Hash()
 
@@ -114,7 +120,7 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
 	lastHead, lastPrice := gpo.lastHead, gpo.lastPrice
 	gpo.cacheLock.RUnlock()
 	if headHash == lastHead {
-		return lastPrice, nil
+		return new(big.Int).Set(lastPrice), nil
 	}
 	gpo.fetchLock.Lock()
 	defer gpo.fetchLock.Unlock()
@@ -124,17 +130,17 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
 	lastHead, lastPrice = gpo.lastHead, gpo.lastPrice
 	gpo.cacheLock.RUnlock()
 	if headHash == lastHead {
-		return lastPrice, nil
+		return new(big.Int).Set(lastPrice), nil
 	}
 	var (
 		sent, exp int
 		number    = head.Number.Uint64()
-		result    = make(chan getBlockPricesResult, gpo.checkBlocks)
+		result    = make(chan results, gpo.checkBlocks)
 		quit      = make(chan struct{})
-		txPrices  []*big.Int
+		results   []*big.Int
 	)
 	for sent < gpo.checkBlocks && number > 0 {
-		go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(number))), number, sampleNumber, gpo.ignorePrice, result, quit)
+		go gpo.getBlockValues(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(number))), number, sampleNumber, gpo.ignorePrice, result, quit)
 		sent++
 		exp++
 		number--
@@ -143,31 +149,31 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
 		res := <-result
 		if res.err != nil {
 			close(quit)
-			return lastPrice, res.err
+			return new(big.Int).Set(lastPrice), res.err
 		}
 		exp--
 		// Nothing returned. There are two special cases here:
 		// - The block is empty
 		// - All the transactions included are sent by the miner itself.
 		// In these cases, use the latest calculated price for samping.
-		if len(res.prices) == 0 {
+		if len(res.values) == 0 {
-			res.prices = []*big.Int{lastPrice}
+			res.values = []*big.Int{lastPrice}
 		}
 		// Besides, in order to collect enough data for sampling, if nothing
 		// meaningful returned, try to query more blocks. But the maximum
 		// is 2*checkBlocks.
-		if len(res.prices) == 1 && len(txPrices)+1+exp < gpo.checkBlocks*2 && number > 0 {
+		if len(res.values) == 1 && len(results)+1+exp < gpo.checkBlocks*2 && number > 0 {
-			go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(number))), number, sampleNumber, gpo.ignorePrice, result, quit)
+			go gpo.getBlockValues(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(number))), number, sampleNumber, gpo.ignorePrice, result, quit)
 			sent++
 			exp++
 			number--
 		}
-		txPrices = append(txPrices, res.prices...)
+		results = append(results, res.values...)
 	}
 	price := lastPrice
-	if len(txPrices) > 0 {
+	if len(results) > 0 {
-		sort.Sort(bigIntArray(txPrices))
+		sort.Sort(bigIntArray(results))
-		price = txPrices[(len(txPrices)-1)*gpo.percentile/100]
+		price = results[(len(results)-1)*gpo.percentile/100]
 	}
 	if price.Cmp(gpo.maxPrice) > 0 {
 		price = new(big.Int).Set(gpo.maxPrice)
@@ -176,53 +182,74 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
 	gpo.lastHead = headHash
 	gpo.lastPrice = price
 	gpo.cacheLock.Unlock()
-	return price, nil
+
+	return new(big.Int).Set(price), nil
 }
 
-type getBlockPricesResult struct {
+type results struct {
-	prices []*big.Int
+	values []*big.Int
 	err    error
 }
 
-type transactionsByGasPrice []*types.Transaction
+type txSorter struct {
+	txs     []*types.Transaction
+	baseFee *big.Int
+}
 
-func (t transactionsByGasPrice) Len() int           { return len(t) }
+func newSorter(txs []*types.Transaction, baseFee *big.Int) *txSorter {
-func (t transactionsByGasPrice) Swap(i, j int)      { t[i], t[j] = t[j], t[i] }
+	return &txSorter{
-func (t transactionsByGasPrice) Less(i, j int) bool { return t[i].FeeCapCmp(t[j]) < 0 }
+		txs:     txs,
+		baseFee: baseFee,
+	}
+}
+
+func (s *txSorter) Len() int { return len(s.txs) }
+func (s *txSorter) Swap(i, j int) {
+	s.txs[i], s.txs[j] = s.txs[j], s.txs[i]
+}
+func (s *txSorter) Less(i, j int) bool {
+	// It's okay to discard the error because a tx would never be
+	// accepted into a block with an invalid effective tip.
+	tip1, _ := s.txs[i].EffectiveTip(s.baseFee)
+	tip2, _ := s.txs[j].EffectiveTip(s.baseFee)
+	return tip1.Cmp(tip2) < 0
+}
 
 // getBlockPrices calculates the lowest transaction gas price in a given block
 // and sends it to the result channel. If the block is empty or all transactions
 // are sent by the miner itself(it doesn't make any sense to include this kind of
 // transaction prices for sampling), nil gasprice is returned.
-func (gpo *Oracle) getBlockPrices(ctx context.Context, signer types.Signer, blockNum uint64, limit int, ignoreUnder *big.Int, result chan getBlockPricesResult, quit chan struct{}) {
+func (gpo *Oracle) getBlockValues(ctx context.Context, signer types.Signer, blockNum uint64, limit int, ignoreUnder *big.Int, result chan results, quit chan struct{}) {
 	block, err := gpo.backend.BlockByNumber(ctx, rpc.BlockNumber(blockNum))
 	if block == nil {
 		select {
-		case result <- getBlockPricesResult{nil, err}:
+		case result <- results{nil, err}:
 		case <-quit:
 		}
 		return
 	}
-	blockTxs := block.Transactions()
+	// Sort the transaction by effective tip in ascending sort.
-	txs := make([]*types.Transaction, len(blockTxs))
+	txs := make([]*types.Transaction, len(block.Transactions()))
-	copy(txs, blockTxs)
+	copy(txs, block.Transactions())
-	sort.Sort(transactionsByGasPrice(txs))
+	sorter := newSorter(txs, block.BaseFee())
+	sort.Sort(sorter)
 
 	var prices []*big.Int
-	for _, tx := range txs {
+	for _, tx := range sorter.txs {
-		if ignoreUnder != nil && tx.GasPrice().Cmp(ignoreUnder) == -1 {
+		tip, _ := tx.EffectiveTip(block.BaseFee())
+		if ignoreUnder != nil && tip.Cmp(ignoreUnder) == -1 {
 			continue
 		}
 		sender, err := types.Sender(signer, tx)
 		if err == nil && sender != block.Coinbase() {
-			prices = append(prices, tx.GasPrice())
+			prices = append(prices, tip)
 			if len(prices) >= limit {
 				break
 			}
 		}
 	}
 	select {
-	case result <- getBlockPricesResult{prices, nil}:
+	case result <- results{prices, nil}:
 	case <-quit:
 	}
 }

eth/gasprice/gasprice_test.go

@@ -55,7 +55,7 @@ func (b *testBackend) ChainConfig() *params.ChainConfig {
 	return b.chain.Config()
 }
 
-func newTestBackend(t *testing.T) *testBackend {
+func newTestBackend(t *testing.T, londonBlock *big.Int) *testBackend {
 	var (
 		key, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
 		addr   = crypto.PubkeyToAddress(key.PublicKey)
@@ -65,14 +65,42 @@ func newTestBackend(t *testing.T) *testBackend {
 		}
 		signer = types.LatestSigner(gspec.Config)
 	)
+	if londonBlock != nil {
+		gspec.Config.LondonBlock = londonBlock
+		signer = types.LatestSigner(gspec.Config)
+	}
 	engine := ethash.NewFaker()
 	db := rawdb.NewMemoryDatabase()
 	genesis, _ := gspec.Commit(db)
 
 	// Generate testing blocks
-	blocks, _ := core.GenerateChain(params.TestChainConfig, genesis, engine, db, 32, func(i int, b *core.BlockGen) {
+	blocks, _ := core.GenerateChain(gspec.Config, genesis, engine, db, 32, func(i int, b *core.BlockGen) {
 		b.SetCoinbase(common.Address{1})
-		tx, err := types.SignTx(types.NewTransaction(b.TxNonce(addr), common.HexToAddress("deadbeef"), big.NewInt(100), 21000, big.NewInt(int64(i+1)*params.GWei), nil), signer, key)
+
+		var tx *types.Transaction
+		if londonBlock != nil && b.Number().Cmp(londonBlock) >= 0 {
+			txdata := &types.DynamicFeeTx{
+				ChainID: gspec.Config.ChainID,
+				Nonce:   b.TxNonce(addr),
+				To:      &common.Address{},
+				Gas:     30000,
+				FeeCap:  big.NewInt(100 * params.GWei),
+				Tip:     big.NewInt(int64(i+1) * params.GWei),
+				Data:    []byte{},
+			}
+			tx = types.NewTx(txdata)
+		} else {
+			txdata := &types.LegacyTx{
+				Nonce:    b.TxNonce(addr),
+				To:       &common.Address{},
+				Gas:      21000,
+				GasPrice: big.NewInt(int64(i+1) * params.GWei),
+				Value:    big.NewInt(100),
+				Data:     []byte{},
+			}
+			tx = types.NewTx(txdata)
+		}
+		tx, err := types.SignTx(tx, signer, key)
 		if err != nil {
 			t.Fatalf("failed to create tx: %v", err)
 		}
@@ -81,7 +109,7 @@ func newTestBackend(t *testing.T) *testBackend {
 	// Construct testing chain
 	diskdb := rawdb.NewMemoryDatabase()
 	gspec.Commit(diskdb)
-	chain, err := core.NewBlockChain(diskdb, nil, params.TestChainConfig, engine, vm.Config{}, nil, nil)
+	chain, err := core.NewBlockChain(diskdb, nil, gspec.Config, engine, vm.Config{}, nil, nil)
 	if err != nil {
 		t.Fatalf("Failed to create local chain, %v", err)
 	}
@@ -97,22 +125,33 @@ func (b *testBackend) GetBlockByNumber(number uint64) *types.Block {
 	return b.chain.GetBlockByNumber(number)
 }
 
-func TestSuggestPrice(t *testing.T) {
+func TestSuggestTipCap(t *testing.T) {
 	config := Config{
 		Blocks:     3,
 		Percentile: 60,
 		Default:    big.NewInt(params.GWei),
 	}
-	backend := newTestBackend(t)
+	var cases = []struct {
+		fork   *big.Int // London fork number
+		expect *big.Int // Expected gasprice suggestion
+	}{
+		{nil, big.NewInt(params.GWei * int64(30))},
+		{big.NewInt(0), big.NewInt(params.GWei * int64(30))},  // Fork point in genesis
+		{big.NewInt(1), big.NewInt(params.GWei * int64(30))},  // Fork point in first block
+		{big.NewInt(32), big.NewInt(params.GWei * int64(30))}, // Fork point in last block
+		{big.NewInt(33), big.NewInt(params.GWei * int64(30))}, // Fork point in the future
+	}
+	for _, c := range cases {
+		backend := newTestBackend(t, c.fork)
 		oracle := NewOracle(backend, config)
 
 		// The gas price sampled is: 32G, 31G, 30G, 29G, 28G, 27G
-	got, err := oracle.SuggestPrice(context.Background())
+		got, err := oracle.SuggestTipCap(context.Background())
 		if err != nil {
 			t.Fatalf("Failed to retrieve recommended gas price: %v", err)
 		}
-	expect := big.NewInt(params.GWei * int64(30))
+		if got.Cmp(c.expect) != 0 {
-	if got.Cmp(expect) != 0 {
+			t.Fatalf("Gas price mismatch, want %d, got %d", c.expect, got)
-		t.Fatalf("Gas price mismatch, want %d, got %d", expect, got)
+		}
 	}
 }

eth/protocols/snap/range_test.go

@@ -53,7 +53,7 @@ func TestHashRanges(t *testing.T) {
 			head:   common.HexToHash("0x2000000000000000000000000000000000000000000000000000000000000000"),
 			chunks: 2,
 			starts: []common.Hash{
-				common.Hash{},
+				{},
 				common.HexToHash("0x9000000000000000000000000000000000000000000000000000000000000000"),
 			},
 			ends: []common.Hash{

eth/tracers/api.go

@@ -762,7 +762,10 @@ func (api *API) TraceCall(ctx context.Context, args ethapi.TransactionArgs, bloc
 		}
 	}
 	// Execute the trace
-	msg := args.ToMessage(api.backend.RPCGasCap())
+	msg, err := args.ToMessage(api.backend.RPCGasCap(), block.BaseFee())
+	if err != nil {
+		return nil, err
+	}
 	vmctx := core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
 
 	var traceConfig *TraceConfig

graphql/graphql.go

@@ -1106,8 +1106,22 @@ func (r *Resolver) Logs(ctx context.Context, args struct{ Filter FilterCriteria
 }
 
 func (r *Resolver) GasPrice(ctx context.Context) (hexutil.Big, error) {
-	price, err := r.backend.SuggestPrice(ctx)
+	tipcap, err := r.backend.SuggestGasTipCap(ctx)
-	return hexutil.Big(*price), err
+	if err != nil {
+		return hexutil.Big{}, err
+	}
+	if head := r.backend.CurrentHeader(); head.BaseFee != nil {
+		tipcap.Add(tipcap, head.BaseFee)
+	}
+	return (hexutil.Big)(*tipcap), nil
+}
+
+func (r *Resolver) MaxPriorityFeePerGas(ctx context.Context) (hexutil.Big, error) {
+	tipcap, err := r.backend.SuggestGasTipCap(ctx)
+	if err != nil {
+		return hexutil.Big{}, err
+	}
+	return (hexutil.Big)(*tipcap), nil
 }
 
 func (r *Resolver) ChainID(ctx context.Context) (hexutil.Big, error) {

graphql/schema.go

@@ -319,6 +319,9 @@ const schema string = `
         # GasPrice returns the node's estimate of a gas price sufficient to
         # ensure a transaction is mined in a timely fashion.
         gasPrice: BigInt!
+        # MaxPriorityFeePerGas returns the node's estimate of a gas tip sufficient
+        # to ensure a transaction is mined in a timely fashion.
+        maxPriorityFeePerGas: BigInt!
         # Syncing returns information on the current synchronisation state.
         syncing: SyncState
         # ChainID returns the current chain ID for transaction replay protection.

internal/ethapi/api.go

@@ -34,6 +34,7 @@ import (
 	"github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/consensus/clique"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
+	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -58,10 +59,25 @@ func NewPublicEthereumAPI(b Backend) *PublicEthereumAPI {
 	return &PublicEthereumAPI{b}
 }
 
-// GasPrice returns a suggestion for a gas price.
+// GasPrice returns a suggestion for a gas price for legacy transactions.
 func (s *PublicEthereumAPI) GasPrice(ctx context.Context) (*hexutil.Big, error) {
-	price, err := s.b.SuggestPrice(ctx)
+	tipcap, err := s.b.SuggestGasTipCap(ctx)
-	return (*hexutil.Big)(price), err
+	if err != nil {
+		return nil, err
+	}
+	if head := s.b.CurrentHeader(); head.BaseFee != nil {
+		tipcap.Add(tipcap, head.BaseFee)
+	}
+	return (*hexutil.Big)(tipcap), err
+}
+
+// MaxPriorityFeePerGas returns a suggestion for a gas tip cap for dynamic transactions.
+func (s *PublicEthereumAPI) MaxPriorityFeePerGas(ctx context.Context) (*hexutil.Big, error) {
+	tipcap, err := s.b.SuggestGasTipCap(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return (*hexutil.Big)(tipcap), err
 }
 
 // Syncing returns false in case the node is currently not syncing with the network. It can be up to date or has not
@@ -105,12 +121,12 @@ func (s *PublicTxPoolAPI) Content() map[string]map[string]map[string]*RPCTransac
 		"queued":  make(map[string]map[string]*RPCTransaction),
 	}
 	pending, queue := s.b.TxPoolContent()
-
+	curHeader := s.b.CurrentHeader()
 	// Flatten the pending transactions
 	for account, txs := range pending {
 		dump := make(map[string]*RPCTransaction)
 		for _, tx := range txs {
-			dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx)
+			dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx, curHeader, s.b.ChainConfig())
 		}
 		content["pending"][account.Hex()] = dump
 	}
@@ -118,7 +134,7 @@ func (s *PublicTxPoolAPI) Content() map[string]map[string]map[string]*RPCTransac
 	for account, txs := range queue {
 		dump := make(map[string]*RPCTransaction)
 		for _, tx := range txs {
-			dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx)
+			dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx, curHeader, s.b.ChainConfig())
 		}
 		content["queued"][account.Hex()] = dump
 	}
@@ -829,7 +845,10 @@ func DoCall(ctx context.Context, b Backend, args TransactionArgs, blockNrOrHash
 	defer cancel()
 
 	// Get a new instance of the EVM.
-	msg := args.ToMessage(globalGasCap)
+	msg, err := args.ToMessage(globalGasCap, header.BaseFee)
+	if err != nil {
+		return nil, err
+	}
 	evm, vmError, err := b.GetEVM(ctx, msg, state, header, nil)
 	if err != nil {
 		return nil, err
@@ -1088,7 +1107,7 @@ func FormatLogs(logs []vm.StructLog) []StructLogRes {
 
 // RPCMarshalHeader converts the given header to the RPC output .
 func RPCMarshalHeader(head *types.Header) map[string]interface{} {
-	return map[string]interface{}{
+	result := map[string]interface{}{
 		"number":           (*hexutil.Big)(head.Number),
 		"hash":             head.Hash(),
 		"parentHash":       head.ParentHash,
@@ -1107,6 +1126,12 @@ func RPCMarshalHeader(head *types.Header) map[string]interface{} {
 		"transactionsRoot": head.TxHash,
 		"receiptsRoot":     head.ReceiptHash,
 	}
+
+	if head.BaseFee != nil {
+		result["baseFeePerGas"] = (*hexutil.Big)(head.BaseFee)
+	}
+
+	return result
 }
 
 // RPCMarshalBlock converts the given block to the RPC output which depends on fullTx. If inclTx is true transactions are
@@ -1173,6 +1198,8 @@ type RPCTransaction struct {
 	From             common.Address    `json:"from"`
 	Gas              hexutil.Uint64    `json:"gas"`
 	GasPrice         *hexutil.Big      `json:"gasPrice"`
+	FeeCap           *hexutil.Big      `json:"maxFeePerGas,omitempty"`
+	Tip              *hexutil.Big      `json:"maxPriorityFeePerGas,omitempty"`
 	Hash             common.Hash       `json:"hash"`
 	Input            hexutil.Bytes     `json:"input"`
 	Nonce            hexutil.Uint64    `json:"nonce"`
@@ -1189,7 +1216,7 @@ type RPCTransaction struct {
 
 // newRPCTransaction returns a transaction that will serialize to the RPC
 // representation, with the given location metadata set (if available).
-func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber uint64, index uint64) *RPCTransaction {
+func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber uint64, index uint64, baseFee *big.Int) *RPCTransaction {
 	// Determine the signer. For replay-protected transactions, use the most permissive
 	// signer, because we assume that signers are backwards-compatible with old
 	// transactions. For non-protected transactions, the homestead signer signer is used
@@ -1200,7 +1227,6 @@ func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber
 	} else {
 		signer = types.HomesteadSigner{}
 	}
-
 	from, _ := types.Sender(signer, tx)
 	v, r, s := tx.RawSignatureValues()
 	result := &RPCTransaction{
@@ -1222,17 +1248,36 @@ func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber
 		result.BlockNumber = (*hexutil.Big)(new(big.Int).SetUint64(blockNumber))
 		result.TransactionIndex = (*hexutil.Uint64)(&index)
 	}
-	if tx.Type() != types.LegacyTxType {
+	switch tx.Type() {
+	case types.AccessListTxType:
 		al := tx.AccessList()
 		result.Accesses = &al
 		result.ChainID = (*hexutil.Big)(tx.ChainId())
+	case types.DynamicFeeTxType:
+		al := tx.AccessList()
+		result.Accesses = &al
+		result.ChainID = (*hexutil.Big)(tx.ChainId())
+		result.FeeCap = (*hexutil.Big)(tx.FeeCap())
+		result.Tip = (*hexutil.Big)(tx.Tip())
+		// if the transaction has been mined, compute the effective gas price
+		if baseFee != nil && blockHash != (common.Hash{}) {
+			// price = min(tip, feeCap - baseFee) + baseFee
+			price := math.BigMin(new(big.Int).Add(tx.Tip(), baseFee), tx.FeeCap())
+			result.GasPrice = (*hexutil.Big)(price)
+		} else {
+			result.GasPrice = nil
+		}
 	}
 	return result
 }
 
 // newRPCPendingTransaction returns a pending transaction that will serialize to the RPC representation
-func newRPCPendingTransaction(tx *types.Transaction) *RPCTransaction {
+func newRPCPendingTransaction(tx *types.Transaction, current *types.Header, config *params.ChainConfig) *RPCTransaction {
-	return newRPCTransaction(tx, common.Hash{}, 0, 0)
+	var baseFee *big.Int
+	if current != nil {
+		baseFee = misc.CalcBaseFee(config, current)
+	}
+	return newRPCTransaction(tx, common.Hash{}, 0, 0, baseFee)
 }
 
 // newRPCTransactionFromBlockIndex returns a transaction that will serialize to the RPC representation.
@@ -1241,7 +1286,7 @@ func newRPCTransactionFromBlockIndex(b *types.Block, index uint64) *RPCTransacti
 	if index >= uint64(len(txs)) {
 		return nil
 	}
-	return newRPCTransaction(txs[index], b.Hash(), b.NumberU64(), index)
+	return newRPCTransaction(txs[index], b.Hash(), b.NumberU64(), index, b.BaseFee())
 }
 
 // newRPCRawTransactionFromBlockIndex returns the bytes of a transaction given a block and a transaction index.
@@ -1450,11 +1495,15 @@ func (s *PublicTransactionPoolAPI) GetTransactionByHash(ctx context.Context, has
 		return nil, err
 	}
 	if tx != nil {
-		return newRPCTransaction(tx, blockHash, blockNumber, index), nil
+		header, err := s.b.HeaderByHash(ctx, blockHash)
+		if err != nil {
+			return nil, err
+		}
+		return newRPCTransaction(tx, blockHash, blockNumber, index, header.BaseFee), nil
 	}
 	// No finalized transaction, try to retrieve it from the pool
 	if tx := s.b.GetPoolTransaction(hash); tx != nil {
-		return newRPCPendingTransaction(tx), nil
+		return newRPCPendingTransaction(tx, s.b.CurrentHeader(), s.b.ChainConfig()), nil
 	}
 
 	// Transaction unknown, return as such
@@ -1705,11 +1754,12 @@ func (s *PublicTransactionPoolAPI) PendingTransactions() ([]*RPCTransaction, err
 			accounts[account.Address] = struct{}{}
 		}
 	}
+	curHeader := s.b.CurrentHeader()
 	transactions := make([]*RPCTransaction, 0, len(pending))
 	for _, tx := range pending {
 		from, _ := types.Sender(s.signer, tx)
 		if _, exists := accounts[from]; exists {
-			transactions = append(transactions, newRPCPendingTransaction(tx))
+			transactions = append(transactions, newRPCPendingTransaction(tx, curHeader, s.b.ChainConfig()))
 		}
 	}
 	return transactions, nil

internal/ethapi/backend.go

@@ -41,7 +41,7 @@ import (
 type Backend interface {
 	// General Ethereum API
 	Downloader() *downloader.Downloader
-	SuggestPrice(ctx context.Context) (*big.Int, error)
+	SuggestGasTipCap(ctx context.Context) (*big.Int, error)
 	ChainDb() ethdb.Database
 	AccountManager() *accounts.Manager
 	ExtRPCEnabled() bool

internal/ethapi/transaction_args.go

@@ -20,6 +20,7 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"fmt"
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -37,6 +38,8 @@ type TransactionArgs struct {
 	To       *common.Address `json:"to"`
 	Gas      *hexutil.Uint64 `json:"gas"`
 	GasPrice *hexutil.Big    `json:"gasPrice"`
+	FeeCap   *hexutil.Big    `json:"maxFeePerGas"`
+	Tip      *hexutil.Big    `json:"maxPriorityFeePerGas"`
 	Value    *hexutil.Big    `json:"value"`
 	Nonce    *hexutil.Uint64 `json:"nonce"`
 
@@ -72,13 +75,44 @@ func (arg *TransactionArgs) data() []byte {
 
 // setDefaults fills in default values for unspecified tx fields.
 func (args *TransactionArgs) setDefaults(ctx context.Context, b Backend) error {
-	if args.GasPrice == nil {
+	if args.GasPrice != nil && (args.FeeCap != nil || args.Tip != nil) {
-		price, err := b.SuggestPrice(ctx)
+		return errors.New("both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
+	}
+	// After london, default to 1559 unless gasPrice is set
+	head := b.CurrentHeader()
+	if b.ChainConfig().IsLondon(head.Number) && args.GasPrice == nil {
+		if args.Tip == nil {
+			tip, err := b.SuggestGasTipCap(ctx)
 			if err != nil {
 				return err
 			}
+			args.Tip = (*hexutil.Big)(tip)
+		}
+		if args.FeeCap == nil {
+			feeCap := new(big.Int).Add(
+				(*big.Int)(args.Tip),
+				new(big.Int).Mul(head.BaseFee, big.NewInt(2)),
+			)
+			args.FeeCap = (*hexutil.Big)(feeCap)
+		}
+		if args.FeeCap.ToInt().Cmp(args.Tip.ToInt()) < 0 {
+			return fmt.Errorf("maxFeePerGas (%v) < maxPriorityFeePerGas (%v)", args.FeeCap, args.Tip)
+		}
+	} else {
+		if args.FeeCap != nil || args.Tip != nil {
+			return errors.New("maxFeePerGas or maxPriorityFeePerGas specified but london is not active yet")
+		}
+		if args.GasPrice == nil {
+			price, err := b.SuggestGasTipCap(ctx)
+			if err != nil {
+				return err
+			}
+			if b.ChainConfig().IsLondon(head.Number) {
+				price.Add(price, head.BaseFee)
+			}
 			args.GasPrice = (*hexutil.Big)(price)
 		}
+	}
 	if args.Value == nil {
 		args.Value = new(hexutil.Big)
 	}
@@ -103,6 +137,8 @@ func (args *TransactionArgs) setDefaults(ctx context.Context, b Backend) error {
 			From:       args.From,
 			To:         args.To,
 			GasPrice:   args.GasPrice,
+			FeeCap:     args.FeeCap,
+			Tip:        args.Tip,
 			Value:      args.Value,
 			Data:       args.Data,
 			AccessList: args.AccessList,
@@ -123,7 +159,11 @@ func (args *TransactionArgs) setDefaults(ctx context.Context, b Backend) error {
 }
 
 // ToMessage converts TransactionArgs to the Message type used by the core evm
-func (args *TransactionArgs) ToMessage(globalGasCap uint64) types.Message {
+func (args *TransactionArgs) ToMessage(globalGasCap uint64, baseFee *big.Int) (types.Message, error) {
+	// Reject invalid combinations of pre- and post-1559 fee styles
+	if args.GasPrice != nil && (args.FeeCap != nil || args.Tip != nil) {
+		return types.Message{}, errors.New("both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
+	}
 	// Set sender address or use zero address if none specified.
 	addr := args.from()
 
@@ -139,10 +179,35 @@ func (args *TransactionArgs) ToMessage(globalGasCap uint64) types.Message {
 		log.Warn("Caller gas above allowance, capping", "requested", gas, "cap", globalGasCap)
 		gas = globalGasCap
 	}
-	gasPrice := new(big.Int)
+	var (
+		gasPrice *big.Int
+		feeCap   *big.Int
+		tip      *big.Int
+	)
+	if baseFee == nil {
+		// If there's no basefee, then it must be a non-1559 execution
+		gasPrice = new(big.Int)
 		if args.GasPrice != nil {
 			gasPrice = args.GasPrice.ToInt()
 		}
+		feeCap, tip = gasPrice, gasPrice
+	} else {
+		// A basefee is provided, necessitating 1559-type execution
+		if args.GasPrice != nil {
+			gasPrice = args.GasPrice.ToInt()
+			feeCap, tip = gasPrice, gasPrice
+		} else {
+			feeCap = new(big.Int)
+			if args.FeeCap != nil {
+				feeCap = args.FeeCap.ToInt()
+			}
+			tip = new(big.Int)
+			if args.Tip != nil {
+				tip = args.Tip.ToInt()
+			}
+			gasPrice = math.BigMin(new(big.Int).Add(tip, baseFee), feeCap)
+		}
+	}
 	value := new(big.Int)
 	if args.Value != nil {
 		value = args.Value.ToInt()
@@ -152,24 +217,32 @@ func (args *TransactionArgs) ToMessage(globalGasCap uint64) types.Message {
 	if args.AccessList != nil {
 		accessList = *args.AccessList
 	}
-	msg := types.NewMessage(addr, args.To, 0, value, gas, gasPrice, nil, nil, data, accessList, false)
+	msg := types.NewMessage(addr, args.To, 0, value, gas, gasPrice, feeCap, tip, data, accessList, false)
-	return msg
+	return msg, nil
 }
 
 // toTransaction converts the arguments to a transaction.
 // This assumes that setDefaults has been called.
 func (args *TransactionArgs) toTransaction() *types.Transaction {
 	var data types.TxData
-	if args.AccessList == nil {
+	switch {
-		data = &types.LegacyTx{
+	case args.FeeCap != nil:
+		al := types.AccessList{}
+		if args.AccessList != nil {
+			al = *args.AccessList
+		}
+		data = &types.DynamicFeeTx{
 			To:         args.To,
+			ChainID:    (*big.Int)(args.ChainID),
 			Nonce:      uint64(*args.Nonce),
 			Gas:        uint64(*args.Gas),
-			GasPrice: (*big.Int)(args.GasPrice),
+			FeeCap:     (*big.Int)(args.FeeCap),
+			Tip:        (*big.Int)(args.Tip),
 			Value:      (*big.Int)(args.Value),
 			Data:       args.data(),
+			AccessList: al,
 		}
-	} else {
+	case args.AccessList != nil:
 		data = &types.AccessListTx{
 			To:         args.To,
 			ChainID:    (*big.Int)(args.ChainID),
@@ -180,6 +253,15 @@ func (args *TransactionArgs) toTransaction() *types.Transaction {
 			Data:       args.data(),
 			AccessList: *args.AccessList,
 		}
+	default:
+		data = &types.LegacyTx{
+			To:       args.To,
+			Nonce:    uint64(*args.Nonce),
+			Gas:      uint64(*args.Gas),
+			GasPrice: (*big.Int)(args.GasPrice),
+			Value:    (*big.Int)(args.Value),
+			Data:     args.data(),
+		}
 	}
 	return types.NewTx(data)
 }

internal/jsre/deps/web3.js

@@ -3759,7 +3759,7 @@ var inputTransactionFormatter = function (options){
         options.to = inputAddressFormatter(options.to);
     }
 
-    ['gasPrice', 'gas', 'value', 'nonce'].filter(function (key) {
+    ['maxFeePerGas', 'maxPriorityFeePerGas', 'gasPrice', 'gas', 'value', 'nonce'].filter(function (key) {
         return options[key] !== undefined;
     }).forEach(function(key){
         options[key] = utils.fromDecimal(options[key]);
@@ -3783,6 +3783,12 @@ var outputTransactionFormatter = function (tx){
     tx.nonce = utils.toDecimal(tx.nonce);
     tx.gas = utils.toDecimal(tx.gas);
     tx.gasPrice = utils.toBigNumber(tx.gasPrice);
+    if(tx.maxFeePerGas !== undefined) {
+      tx.maxFeePerGas = utils.toBigNumber(tx.maxFeePerGas);
+    }
+    if(tx.maxPriorityFeePerGas !== undefined) {
+      tx.maxPriorityFeePerGas = utils.toBigNumber(tx.maxPriorityFeePerGas);
+    }
     tx.value = utils.toBigNumber(tx.value);
     return tx;
 };
@@ -3819,8 +3825,10 @@ var outputTransactionReceiptFormatter = function (receipt){
  * @returns {Object}
 */
 var outputBlockFormatter = function(block) {
-
     // transform to number
+    if (block.baseFeePerGas !== undefined) {
+      block.baseFeePerGas = utils.toBigNumber(block.baseFeePerGas);
+    }
     block.gasLimit = utils.toDecimal(block.gasLimit);
     block.gasUsed = utils.toDecimal(block.gasUsed);
     block.size = utils.toDecimal(block.size);

internal/web3ext/web3ext.go

@@ -595,6 +595,11 @@ web3._extend({
 				return formatted;
 			}
 		}),
+		new web3._extend.Property({
+			name: 'maxPriorityFeePerGas',
+			getter: 'eth_maxPriorityFeePerGas',
+			outputFormatter: web3._extend.utils.toBigNumber
+		}),
 	]
 });
 `

les/api_backend.go

@@ -251,8 +251,8 @@ func (b *LesApiBackend) ProtocolVersion() int {
 	return b.eth.LesVersion() + 10000
 }
 
-func (b *LesApiBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
+func (b *LesApiBackend) SuggestGasTipCap(ctx context.Context) (*big.Int, error) {
-	return b.gpo.SuggestPrice(ctx)
+	return b.gpo.SuggestTipCap(ctx)
 }
 
 func (b *LesApiBackend) ChainDb() ethdb.Database {