Constant ECOTONE_L1_BLOB_BASE_FEE_SLOT 

pub const ECOTONE_L1_BLOB_BASE_FEE_SLOT: Uint<256, 4>;

Available on crate feature evm only.

ECOTONE_L1_BLOB_BASE_FEE_SLOT was added in the Ecotone upgrade and stores the L1 blobBaseFee attribute.