eth: Add eth_blobBaseFee RPC and blob fields to eth_feeHistory (#29140)

Co-authored-by: lightclient <lightclient@protonmail.com>
Co-authored-by: Felix Lange <fjl@twurst.com>

eth/api_backend.go

@@ -26,6 +26,7 @@ import (
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
+	"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/bloombits"
 	"github.com/ethereum/go-ethereum/core/rawdb"
@@ -361,10 +362,17 @@ func (b *EthAPIBackend) SuggestGasTipCap(ctx context.Context) (*big.Int, error)
 	return b.gpo.SuggestTipCap(ctx)
 }
 
-func (b *EthAPIBackend) FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (firstBlock *big.Int, reward [][]*big.Int, baseFee []*big.Int, gasUsedRatio []float64, err error) {
+func (b *EthAPIBackend) FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (firstBlock *big.Int, reward [][]*big.Int, baseFee []*big.Int, gasUsedRatio []float64, baseFeePerBlobGas []*big.Int, blobGasUsedRatio []float64, err error) {
 	return b.gpo.FeeHistory(ctx, blockCount, lastBlock, rewardPercentiles)
 }
 
+func (b *EthAPIBackend) BlobBaseFee(ctx context.Context) *big.Int {
+	if excess := b.CurrentHeader().ExcessBlobGas; excess != nil {
+		return eip4844.CalcBlobFee(*excess)
+	}
+	return nil
+}
+
 func (b *EthAPIBackend) ChainDb() ethdb.Database {
 	return b.eth.ChainDb()
 }

eth/gasprice/feehistory.go

@@ -28,8 +28,10 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus/misc/eip1559"
+	"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 )
 
@@ -63,9 +65,11 @@ type cacheKey struct {
 
 // processedFees contains the results of a processed block.
 type processedFees struct {
-	reward               []*big.Int
+	reward                       []*big.Int
-	baseFee, nextBaseFee *big.Int
+	baseFee, nextBaseFee         *big.Int
-	gasUsedRatio         float64
+	gasUsedRatio                 float64
+	blobGasUsedRatio             float64
+	blobBaseFee, nextBlobBaseFee *big.Int
 }
 
 // txGasAndReward is sorted in ascending order based on reward
@@ -78,16 +82,31 @@ type txGasAndReward struct {
 // the block field filled in, retrieves the block from the backend if not present yet and
 // fills in the rest of the fields.
 func (oracle *Oracle) processBlock(bf *blockFees, percentiles []float64) {
-	chainconfig := oracle.backend.ChainConfig()
+	config := oracle.backend.ChainConfig()
+
+	// Fill in base fee and next base fee.
 	if bf.results.baseFee = bf.header.BaseFee; bf.results.baseFee == nil {
 		bf.results.baseFee = new(big.Int)
 	}
-	if chainconfig.IsLondon(big.NewInt(int64(bf.blockNumber + 1))) {
+	if config.IsLondon(big.NewInt(int64(bf.blockNumber + 1))) {
-		bf.results.nextBaseFee = eip1559.CalcBaseFee(chainconfig, bf.header)
+		bf.results.nextBaseFee = eip1559.CalcBaseFee(config, bf.header)
 	} else {
 		bf.results.nextBaseFee = new(big.Int)
 	}
+	// Fill in blob base fee and next blob base fee.
+	if excessBlobGas := bf.header.ExcessBlobGas; excessBlobGas != nil {
+		bf.results.blobBaseFee = eip4844.CalcBlobFee(*excessBlobGas)
+		bf.results.nextBlobBaseFee = eip4844.CalcBlobFee(eip4844.CalcExcessBlobGas(*excessBlobGas, *bf.header.BlobGasUsed))
+	} else {
+		bf.results.blobBaseFee = new(big.Int)
+		bf.results.nextBlobBaseFee = new(big.Int)
+	}
+	// Compute gas used ratio for normal and blob gas.
 	bf.results.gasUsedRatio = float64(bf.header.GasUsed) / float64(bf.header.GasLimit)
+	if blobGasUsed := bf.header.BlobGasUsed; blobGasUsed != nil {
+		bf.results.blobGasUsedRatio = float64(*blobGasUsed) / params.MaxBlobGasPerBlock
+	}
+
 	if len(percentiles) == 0 {
 		// rewards were not requested, return null
 		return
@@ -203,17 +222,19 @@ func (oracle *Oracle) resolveBlockRange(ctx context.Context, reqEnd rpc.BlockNum
 // or blocks older than a certain age (specified in maxHistory). The first block of the
 // actually processed range is returned to avoid ambiguity when parts of the requested range
 // are not available or when the head has changed during processing this request.
-// Three arrays are returned based on the processed blocks:
+// Five arrays are returned based on the processed blocks:
 //   - reward: the requested percentiles of effective priority fees per gas of transactions in each
 //     block, sorted in ascending order and weighted by gas used.
 //   - baseFee: base fee per gas in the given block
 //   - gasUsedRatio: gasUsed/gasLimit in the given block
+//   - blobBaseFee: the blob base fee per gas in the given block
+//   - blobGasUsedRatio: blobGasUsed/blobGasLimit in the given block
 //
-// Note: baseFee includes the next block after the newest of the returned range, because this
+// Note: baseFee and blobBaseFee both include the next block after the newest of the returned range,
-// value can be derived from the newest block.
+// because this value can be derived from the newest block.
-func (oracle *Oracle) FeeHistory(ctx context.Context, blocks uint64, unresolvedLastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, error) {
+func (oracle *Oracle) FeeHistory(ctx context.Context, blocks uint64, unresolvedLastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, []*big.Int, []float64, error) {
 	if blocks < 1 {
-		return common.Big0, nil, nil, nil, nil // returning with no data and no error means there are no retrievable blocks
+		return common.Big0, nil, nil, nil, nil, nil, nil // returning with no data and no error means there are no retrievable blocks
 	}
 	maxFeeHistory := oracle.maxHeaderHistory
 	if len(rewardPercentiles) != 0 {
@@ -225,10 +246,10 @@ func (oracle *Oracle) FeeHistory(ctx context.Context, blocks uint64, unresolvedL
 	}
 	for i, p := range rewardPercentiles {
 		if p < 0 || p > 100 {
-			return common.Big0, nil, nil, nil, fmt.Errorf("%w: %f", errInvalidPercentile, p)
+			return common.Big0, nil, nil, nil, nil, nil, fmt.Errorf("%w: %f", errInvalidPercentile, p)
 		}
 		if i > 0 && p <= rewardPercentiles[i-1] {
-			return common.Big0, nil, nil, nil, fmt.Errorf("%w: #%d:%f >= #%d:%f", errInvalidPercentile, i-1, rewardPercentiles[i-1], i, p)
+			return common.Big0, nil, nil, nil, nil, nil, fmt.Errorf("%w: #%d:%f >= #%d:%f", errInvalidPercentile, i-1, rewardPercentiles[i-1], i, p)
 		}
 	}
 	var (
@@ -238,7 +259,7 @@ func (oracle *Oracle) FeeHistory(ctx context.Context, blocks uint64, unresolvedL
 	)
 	pendingBlock, pendingReceipts, lastBlock, blocks, err := oracle.resolveBlockRange(ctx, unresolvedLastBlock, blocks)
 	if err != nil || blocks == 0 {
-		return common.Big0, nil, nil, nil, err
+		return common.Big0, nil, nil, nil, nil, nil, err
 	}
 	oldestBlock := lastBlock + 1 - blocks
 
@@ -295,19 +316,22 @@ func (oracle *Oracle) FeeHistory(ctx context.Context, blocks uint64, unresolvedL
 		}()
 	}
 	var (
-		reward       = make([][]*big.Int, blocks)
+		reward           = make([][]*big.Int, blocks)
-		baseFee      = make([]*big.Int, blocks+1)
+		baseFee          = make([]*big.Int, blocks+1)
-		gasUsedRatio = make([]float64, blocks)
+		gasUsedRatio     = make([]float64, blocks)
-		firstMissing = blocks
+		blobGasUsedRatio = make([]float64, blocks)
+		blobBaseFee      = make([]*big.Int, blocks+1)
+		firstMissing     = blocks
 	)
 	for ; blocks > 0; blocks-- {
 		fees := <-results
 		if fees.err != nil {
-			return common.Big0, nil, nil, nil, fees.err
+			return common.Big0, nil, nil, nil, nil, nil, fees.err
 		}
 		i := fees.blockNumber - oldestBlock
 		if fees.results.baseFee != nil {
 			reward[i], baseFee[i], baseFee[i+1], gasUsedRatio[i] = fees.results.reward, fees.results.baseFee, fees.results.nextBaseFee, fees.results.gasUsedRatio
+			blobGasUsedRatio[i], blobBaseFee[i], blobBaseFee[i+1] = fees.results.blobGasUsedRatio, fees.results.blobBaseFee, fees.results.nextBlobBaseFee
 		} else {
 			// getting no block and no error means we are requesting into the future (might happen because of a reorg)
 			if i < firstMissing {
@@ -316,7 +340,7 @@ func (oracle *Oracle) FeeHistory(ctx context.Context, blocks uint64, unresolvedL
 		}
 	}
 	if firstMissing == 0 {
-		return common.Big0, nil, nil, nil, nil
+		return common.Big0, nil, nil, nil, nil, nil, nil
 	}
 	if len(rewardPercentiles) != 0 {
 		reward = reward[:firstMissing]
@@ -324,5 +348,6 @@ func (oracle *Oracle) FeeHistory(ctx context.Context, blocks uint64, unresolvedL
 		reward = nil
 	}
 	baseFee, gasUsedRatio = baseFee[:firstMissing+1], gasUsedRatio[:firstMissing]
-	return new(big.Int).SetUint64(oldestBlock), reward, baseFee, gasUsedRatio, nil
+	blobBaseFee, blobGasUsedRatio = blobBaseFee[:firstMissing+1], blobGasUsedRatio[:firstMissing]
+	return new(big.Int).SetUint64(oldestBlock), reward, baseFee, gasUsedRatio, blobBaseFee, blobGasUsedRatio, nil
 }

eth/gasprice/feehistory_test.go

@@ -58,10 +58,10 @@ func TestFeeHistory(t *testing.T) {
 			MaxHeaderHistory: c.maxHeader,
 			MaxBlockHistory:  c.maxBlock,
 		}
-		backend := newTestBackend(t, big.NewInt(16), c.pending)
+		backend := newTestBackend(t, big.NewInt(16), big.NewInt(28), c.pending)
 		oracle := NewOracle(backend, config)
 
-		first, reward, baseFee, ratio, err := oracle.FeeHistory(context.Background(), c.count, c.last, c.percent)
+		first, reward, baseFee, ratio, blobBaseFee, blobRatio, err := oracle.FeeHistory(context.Background(), c.count, c.last, c.percent)
 		backend.teardown()
 		expReward := c.expCount
 		if len(c.percent) == 0 {
@@ -84,6 +84,12 @@ func TestFeeHistory(t *testing.T) {
 		if len(ratio) != c.expCount {
 			t.Fatalf("Test case %d: gasUsedRatio array length mismatch, want %d, got %d", i, c.expCount, len(ratio))
 		}
+		if len(blobRatio) != c.expCount {
+			t.Fatalf("Test case %d: blobGasUsedRatio array length mismatch, want %d, got %d", i, c.expCount, len(blobRatio))
+		}
+		if len(blobBaseFee) != len(baseFee) {
+			t.Fatalf("Test case %d: blobBaseFee array length mismatch, want %d, got %d", i, len(baseFee), len(blobBaseFee))
+		}
 		if err != c.expErr && !errors.Is(err, c.expErr) {
 			t.Fatalf("Test case %d: error mismatch, want %v, got %v", i, c.expErr, err)
 		}

eth/gasprice/gasprice_test.go

@@ -18,21 +18,26 @@ package gasprice
 
 import (
 	"context"
+	"crypto/sha256"
+	"fmt"
 	"math"
 	"math/big"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/consensus"
+	"github.com/ethereum/go-ethereum/consensus/beacon"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
 	"github.com/ethereum/go-ethereum/core"
-	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/holiman/uint256"
 )
 
 const testHead = 32
@@ -121,7 +126,10 @@ func (b *testBackend) teardown() {
 
 // newTestBackend creates a test backend. OBS: don't forget to invoke tearDown
 // after use, otherwise the blockchain instance will mem-leak via goroutines.
-func newTestBackend(t *testing.T, londonBlock *big.Int, pending bool) *testBackend {
+func newTestBackend(t *testing.T, londonBlock *big.Int, cancunBlock *big.Int, pending bool) *testBackend {
+	if londonBlock != nil && cancunBlock != nil && londonBlock.Cmp(cancunBlock) == 1 {
+		panic("cannot define test backend with cancun before london")
+	}
 	var (
 		key, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
 		addr   = crypto.PubkeyToAddress(key.PublicKey)
@@ -131,15 +139,27 @@ func newTestBackend(t *testing.T, londonBlock *big.Int, pending bool) *testBacke
 			Alloc:  types.GenesisAlloc{addr: {Balance: big.NewInt(math.MaxInt64)}},
 		}
 		signer = types.LatestSigner(gspec.Config)
+
+		// Compute empty blob hash.
+		emptyBlob          = kzg4844.Blob{}
+		emptyBlobCommit, _ = kzg4844.BlobToCommitment(&emptyBlob)
+		emptyBlobVHash     = kzg4844.CalcBlobHashV1(sha256.New(), &emptyBlobCommit)
 	)
 	config.LondonBlock = londonBlock
 	config.ArrowGlacierBlock = londonBlock
 	config.GrayGlacierBlock = londonBlock
-	config.TerminalTotalDifficulty = common.Big0
+	var engine consensus.Engine = beacon.New(ethash.NewFaker())
-	engine := ethash.NewFaker()
+	td := params.GenesisDifficulty.Uint64()
+
+	if cancunBlock != nil {
+		ts := gspec.Timestamp + cancunBlock.Uint64()*10 // fixed 10 sec block time in blockgen
+		config.ShanghaiTime = &ts
+		config.CancunTime = &ts
+		signer = types.LatestSigner(gspec.Config)
+	}
 
 	// Generate testing blocks
-	_, blocks, _ := core.GenerateChainWithGenesis(gspec, engine, testHead+1, func(i int, b *core.BlockGen) {
+	db, blocks, _ := core.GenerateChainWithGenesis(gspec, engine, testHead+1, func(i int, b *core.BlockGen) {
 		b.SetCoinbase(common.Address{1})
 
 		var txdata types.TxData
@@ -164,15 +184,42 @@ func newTestBackend(t *testing.T, londonBlock *big.Int, pending bool) *testBacke
 			}
 		}
 		b.AddTx(types.MustSignNewTx(key, signer, txdata))
+
+		if cancunBlock != nil && b.Number().Cmp(cancunBlock) >= 0 {
+			b.SetPoS()
+
+			// put more blobs in each new block
+			for j := 0; j < i && j < 6; j++ {
+				blobTx := &types.BlobTx{
+					ChainID:    uint256.MustFromBig(gspec.Config.ChainID),
+					Nonce:      b.TxNonce(addr),
+					To:         common.Address{},
+					Gas:        30000,
+					GasFeeCap:  uint256.NewInt(100 * params.GWei),
+					GasTipCap:  uint256.NewInt(uint64(i+1) * params.GWei),
+					Data:       []byte{},
+					BlobFeeCap: uint256.NewInt(1),
+					BlobHashes: []common.Hash{emptyBlobVHash},
+					Value:      uint256.NewInt(100),
+					Sidecar:    nil,
+				}
+				b.AddTx(types.MustSignNewTx(key, signer, blobTx))
+			}
+		}
+		td += b.Difficulty().Uint64()
 	})
 	// Construct testing chain
-	chain, err := core.NewBlockChain(rawdb.NewMemoryDatabase(), &core.CacheConfig{TrieCleanNoPrefetch: true}, gspec, nil, engine, vm.Config{}, nil, nil)
+	gspec.Config.TerminalTotalDifficulty = new(big.Int).SetUint64(td)
+	chain, err := core.NewBlockChain(db, &core.CacheConfig{TrieCleanNoPrefetch: true}, gspec, nil, engine, vm.Config{}, nil, nil)
 	if err != nil {
 		t.Fatalf("Failed to create local chain, %v", err)
 	}
-	chain.InsertChain(blocks)
+	if i, err := chain.InsertChain(blocks); err != nil {
+		panic(fmt.Errorf("error inserting block %d: %w", i, err))
+	}
 	chain.SetFinalized(chain.GetBlockByNumber(25).Header())
 	chain.SetSafe(chain.GetBlockByNumber(25).Header())
+
 	return &testBackend{chain: chain, pending: pending}
 }
 
@@ -201,7 +248,7 @@ func TestSuggestTipCap(t *testing.T) {
 		{big.NewInt(33), big.NewInt(params.GWei * int64(30))}, // Fork point in the future
 	}
 	for _, c := range cases {
-		backend := newTestBackend(t, c.fork, false)
+		backend := newTestBackend(t, c.fork, nil, false)
 		oracle := NewOracle(backend, config)
 
 		// The gas price sampled is: 32G, 31G, 30G, 29G, 28G, 27G

internal/ethapi/api.go

@@ -26,6 +26,9 @@ import (
 	"time"
 
 	"github.com/davecgh/go-spew/spew"
+	"github.com/holiman/uint256"
+	"github.com/tyler-smith/go-bip39"
+
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/accounts/scwallet"
@@ -48,8 +51,6 @@ import (
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/trie"
-	"github.com/holiman/uint256"
-	"github.com/tyler-smith/go-bip39"
 )
 
 // estimateGasErrorRatio is the amount of overestimation eth_estimateGas is
@@ -90,15 +91,17 @@ func (s *EthereumAPI) MaxPriorityFeePerGas(ctx context.Context) (*hexutil.Big, e
 }
 
 type feeHistoryResult struct {
-	OldestBlock  *hexutil.Big     `json:"oldestBlock"`
+	OldestBlock      *hexutil.Big     `json:"oldestBlock"`
-	Reward       [][]*hexutil.Big `json:"reward,omitempty"`
+	Reward           [][]*hexutil.Big `json:"reward,omitempty"`
-	BaseFee      []*hexutil.Big   `json:"baseFeePerGas,omitempty"`
+	BaseFee          []*hexutil.Big   `json:"baseFeePerGas,omitempty"`
-	GasUsedRatio []float64        `json:"gasUsedRatio"`
+	GasUsedRatio     []float64        `json:"gasUsedRatio"`
+	BlobBaseFee      []*hexutil.Big   `json:"baseFeePerBlobGas,omitempty"`
+	BlobGasUsedRatio []float64        `json:"blobGasUsedRatio,omitempty"`
 }
 
 // FeeHistory returns the fee market history.
 func (s *EthereumAPI) FeeHistory(ctx context.Context, blockCount math.HexOrDecimal64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*feeHistoryResult, error) {
-	oldest, reward, baseFee, gasUsed, err := s.b.FeeHistory(ctx, uint64(blockCount), lastBlock, rewardPercentiles)
+	oldest, reward, baseFee, gasUsed, blobBaseFee, blobGasUsed, err := s.b.FeeHistory(ctx, uint64(blockCount), lastBlock, rewardPercentiles)
 	if err != nil {
 		return nil, err
 	}
@@ -121,9 +124,23 @@ func (s *EthereumAPI) FeeHistory(ctx context.Context, blockCount math.HexOrDecim
 			results.BaseFee[i] = (*hexutil.Big)(v)
 		}
 	}
+	if blobBaseFee != nil {
+		results.BlobBaseFee = make([]*hexutil.Big, len(blobBaseFee))
+		for i, v := range blobBaseFee {
+			results.BlobBaseFee[i] = (*hexutil.Big)(v)
+		}
+	}
+	if blobGasUsed != nil {
+		results.BlobGasUsedRatio = blobGasUsed
+	}
 	return results, nil
 }
 
+// BlobBaseFee returns the base fee for blob gas at the current head.
+func (s *EthereumAPI) BlobBaseFee(ctx context.Context) *hexutil.Big {
+	return (*hexutil.Big)(s.b.BlobBaseFee(ctx))
+}
+
 // Syncing returns false in case the node is currently not syncing with the network. It can be up-to-date or has not
 // yet received the latest block headers from its pears. In case it is synchronizing:
 // - startingBlock: block number this node started to synchronize from

internal/ethapi/api_test.go

@@ -32,6 +32,9 @@ import (
 	"testing"
 	"time"
 
+	"github.com/holiman/uint256"
+	"github.com/stretchr/testify/require"
+
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
@@ -53,8 +56,6 @@ import (
 	"github.com/ethereum/go-ethereum/internal/blocktest"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
-	"github.com/holiman/uint256"
-	"github.com/stretchr/testify/require"
 )
 
 func testTransactionMarshal(t *testing.T, tests []txData, config *params.ChainConfig) {
@@ -468,17 +469,18 @@ func (b testBackend) SyncProgress() ethereum.SyncProgress { return ethereum.Sync
 func (b testBackend) SuggestGasTipCap(ctx context.Context) (*big.Int, error) {
 	return big.NewInt(0), nil
 }
-func (b testBackend) FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, error) {
+func (b testBackend) FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, []*big.Int, []float64, error) {
-	return nil, nil, nil, nil, nil
+	return nil, nil, nil, nil, nil, nil, nil
 }
-func (b testBackend) ChainDb() ethdb.Database           { return b.db }
+func (b testBackend) BlobBaseFee(ctx context.Context) *big.Int { return new(big.Int) }
-func (b testBackend) AccountManager() *accounts.Manager { return b.accman }
+func (b testBackend) ChainDb() ethdb.Database                  { return b.db }
-func (b testBackend) ExtRPCEnabled() bool               { return false }
+func (b testBackend) AccountManager() *accounts.Manager        { return b.accman }
-func (b testBackend) RPCGasCap() uint64                 { return 10000000 }
+func (b testBackend) ExtRPCEnabled() bool                      { return false }
-func (b testBackend) RPCEVMTimeout() time.Duration      { return time.Second }
+func (b testBackend) RPCGasCap() uint64                        { return 10000000 }
-func (b testBackend) RPCTxFeeCap() float64              { return 0 }
+func (b testBackend) RPCEVMTimeout() time.Duration             { return time.Second }
-func (b testBackend) UnprotectedAllowed() bool          { return false }
+func (b testBackend) RPCTxFeeCap() float64                     { return 0 }
-func (b testBackend) SetHead(number uint64)             {}
+func (b testBackend) UnprotectedAllowed() bool                 { return false }
+func (b testBackend) SetHead(number uint64)                    {}
 func (b testBackend) HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error) {
 	if number == rpc.LatestBlockNumber {
 		return b.chain.CurrentBlock(), nil

internal/ethapi/backend.go

@@ -44,7 +44,8 @@ type Backend interface {
 	SyncProgress() ethereum.SyncProgress
 
 	SuggestGasTipCap(ctx context.Context) (*big.Int, error)
-	FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, error)
+	FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, []*big.Int, []float64, error)
+	BlobBaseFee(ctx context.Context) *big.Int
 	ChainDb() ethdb.Database
 	AccountManager() *accounts.Manager
 	ExtRPCEnabled() bool

internal/ethapi/transaction_args_test.go

@@ -314,13 +314,15 @@ func (b *backendMock) setFork(fork string) error {
 func (b *backendMock) SuggestGasTipCap(ctx context.Context) (*big.Int, error) {
 	return big.NewInt(42), nil
 }
+func (b *backendMock) BlobBaseFee(ctx context.Context) *big.Int { return big.NewInt(42) }
+
 func (b *backendMock) CurrentHeader() *types.Header     { return b.current }
 func (b *backendMock) ChainConfig() *params.ChainConfig { return b.config }
 
 // Other methods needed to implement Backend interface.
 func (b *backendMock) SyncProgress() ethereum.SyncProgress { return ethereum.SyncProgress{} }
-func (b *backendMock) FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, error) {
+func (b *backendMock) FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, []*big.Int, []float64, error) {
-	return nil, nil, nil, nil, nil
+	return nil, nil, nil, nil, nil, nil, nil
 }
 func (b *backendMock) ChainDb() ethdb.Database           { return nil }
 func (b *backendMock) AccountManager() *accounts.Manager { return nil }

internal/jsre/deps/web3.js

@@ -5519,6 +5519,11 @@ var properties = function () {
             getter: 'eth_gasPrice',
             outputFormatter: formatters.outputBigNumberFormatter
         }),
+        new Property({
+            name: 'blobBaseFee',
+            getter: 'eth_blobBaseFee',
+            outputFormatter: formatters.outputBigNumberFormatter
+        }),
         new Property({
             name: 'accounts',
             getter: 'eth_accounts'