Arbitrum One rollup batch postings to Ethereum L1 and the L1 gas they incurred: the latest SequencerBatchDelivered events on the SequencerInbox with batch number, L1 block and time, data location (blob or calldata), poster, execution gas, blob gas, gas prices and fees in ETH, plus totals. Read from Ethereum mainnet via Etherscan API V2.