The feemarket module which allows to define a global transaction fee for the network.

This module has been designed to support EIP1559 in cosmos-sdk.

The MempoolFeeDecorator in x/auth module needs to be overrided to the minimal-gas-prices.

This module will be used in the XPLA Chain.


The transaction fee is calculated with

fee = gasPrice * gasLimit

where gasPrice is the price per gas and gasLimit describes the amount of gas required to perform the transaction. The more complex operations a transaction requires, the higher the gasLimit (See Executing EVM bytecode). To submit a transaction, the signer needs to specify the gasPrice.


End block

The block_gas_used value is updated at the end of each block.

Block Gas Used

The total gas used by current block is stored in the KVStore at EndBlock.

It is initialized to block_gas defined in the genesis.


The x/feemarket module contains the following parameters:

// Params defines the EVM module parameters
type Params struct {
	// no_base_fee forces the EIP-1559 base fee to 0 (needed for 0 price calls)
	NoBaseFee bool `protobuf:"varint,1,opt,name=no_base_fee,json=noBaseFee,proto3" json:"no_base_fee,omitempty"`
	// base_fee_change_denominator bounds the amount the base fee can change
	// between blocks.
	BaseFeeChangeDenominator uint32 `protobuf:"varint,2,opt,name=base_fee_change_denominator,json=baseFeeChangeDenominator,proto3" json:"base_fee_change_denominator,omitempty"`
	// elasticity_multiplier bounds the maximum gas limit an EIP-1559 block may
	// have.
	ElasticityMultiplier uint32 `protobuf:"varint,3,opt,name=elasticity_multiplier,json=elasticityMultiplier,proto3" json:"elasticity_multiplier,omitempty"`
	// enable_height defines at which block height the base fee calculation is enabled.
	EnableHeight int64 `protobuf:"varint,5,opt,name=enable_height,json=enableHeight,proto3" json:"enable_height,omitempty"`
	// base_fee for EIP-1559 blocks.
	BaseFee github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,6,opt,name=base_fee,json=baseFee,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"base_fee"`
	// min_gas_price defines the minimum gas price value for cosmos and eth transactions
	MinGasPrice github_com_cosmos_cosmos_sdk_types.Dec `protobuf:"bytes,7,opt,name=min_gas_price,json=minGasPrice,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Dec" json:"min_gas_price"`
	// min_gas_multiplier bounds the minimum gas used to be charged
	// to senders based on gas limit
	MinGasMultiplier github_com_cosmos_cosmos_sdk_types.Dec `protobuf:"bytes,8,opt,name=min_gas_multiplier,json=minGasMultiplier,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Dec" json:"min_gas_multiplier"`