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ethapi, eth: implement eth_baseFee RPC method #2231

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ethapi, eth: implement eth_baseFee RPC method #2231

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9b475ba
ethapi, eth: implement eth_baseFee RPC method
wjmelements May 19, 2026
7e3a704
eth/filters: regenerate IBackend mock via go generate
wjmelements May 19, 2026
0552705
Merge remote-tracking branch 'upstream/develop' into eth-base-fee
wjmelements Jun 3, 2026
867b8d0
eth/filters: regenerate IBackend mock via go generate
wjmelements Jun 3, 2026
57b8e90
eth: snapshot CurrentHeader once in BaseFee and BlobBaseFee
wjmelements Jun 3, 2026
19c5a97
test(eth): add unit tests for BaseFee and BlobBaseFee
wjmelements Jun 3, 2026
dc876bd
chore: bump Go from 1.26.3 to 1.26.4
wjmelements Jun 8, 2026
3fa2927
fix(eth): check IsLondon(next block) in BaseFee to fix off-by-one at …
wjmelements Jun 10, 2026
e7e6fd5
Merge remote-tracking branch 'upstream/develop' into eth-base-fee
wjmelements Jun 24, 2026
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8 changes: 8 additions & 0 deletions eth/api_backend.go
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/consensus/misc/eip1559"
"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/filtermaps"
Expand Down Expand Up @@ -527,6 +528,13 @@ func (b *EthAPIBackend) FeeHistory(ctx context.Context, blockCount uint64, lastB
return b.gpo.FeeHistory(ctx, blockCount, lastBlock, rewardPercentiles)
}

func (b *EthAPIBackend) BaseFee(ctx context.Context) *big.Int {
if b.ChainConfig().IsLondon(b.CurrentHeader().Number) {
return eip1559.CalcBaseFee(b.ChainConfig(), b.CurrentHeader())
}
return nil
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}

func (b *EthAPIBackend) BlobBaseFee(ctx context.Context) *big.Int {
if excess := b.CurrentHeader().ExcessBlobGas; excess != nil && b.ChainConfig().BlobScheduleConfig != nil {
return eip4844.CalcBlobFee(b.ChainConfig(), b.CurrentHeader())
Expand Down
14 changes: 14 additions & 0 deletions eth/filters/IBackend.go
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5 changes: 5 additions & 0 deletions internal/ethapi/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,11 @@ func (api *EthereumAPI) BlobBaseFee(ctx context.Context) *hexutil.Big {
return (*hexutil.Big)(api.b.BlobBaseFee(ctx))
}

// BaseFee returns the base fee of the next block.
func (api *EthereumAPI) BaseFee(ctx context.Context) *hexutil.Big {
return (*hexutil.Big)(api.b.BaseFee(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 peers. In case it is synchronizing:
// - startingBlock: block number this node started to synchronize from
Expand Down
1 change: 1 addition & 0 deletions internal/ethapi/api_test.go
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Expand Up @@ -546,6 +546,7 @@ func (b testBackend) FeeHistory(ctx context.Context, blockCount uint64, lastBloc
return nil, nil, nil, nil, nil, nil, nil
}
func (b testBackend) BlobBaseFee(ctx context.Context) *big.Int { return new(big.Int) }
func (b testBackend) BaseFee(ctx context.Context) *big.Int { return new(big.Int) }
func (b testBackend) ChainDb() ethdb.Database { return b.db }
func (b testBackend) AccountManager() *accounts.Manager { return b.accman }
func (b testBackend) ExtRPCEnabled() bool { return false }
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1 change: 1 addition & 0 deletions internal/ethapi/backend.go
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Expand Up @@ -52,6 +52,7 @@ type Backend interface {
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, []*big.Int, []float64, error)
BlobBaseFee(ctx context.Context) *big.Int
BaseFee(ctx context.Context) *big.Int
ChainDb() ethdb.Database
AccountManager() *accounts.Manager
ExtRPCEnabled() bool
Expand Down
1 change: 1 addition & 0 deletions internal/ethapi/transaction_args_test.go
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Expand Up @@ -333,6 +333,7 @@ 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) BaseFee(ctx context.Context) *big.Int { return big.NewInt(0) }

func (b *backendMock) CurrentHeader() *types.Header { return b.current }
func (b *backendMock) ChainConfig() *params.ChainConfig { return b.config }
Expand Down
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