# State The x/feemarket module keeps in the state variable needed to the fee calculation: Only BlockGasUsed in previous block needs to be tracked in state for the next base fee calculation. | | Description | Key | Value | Store | | ----------- | ------------------------------ | ---------------| ------------------- | --------- | | BlockGasUsed | gas used in the block | `[]byte{1}` | `[]byte{gas_used}` | KV |