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Mantle uses MNT as its native gas token, but the OP Stack oracle's getL1Fee returns values denominated in ETH. Add MantleLayer1GasFeeFlow that multiplies the L1 fee by tokenRatio (ETH/MNT exchange rate from the oracle contract) before adding the operator fee. - New MantleLayer1GasFeeFlow extending OracleLayer1GasFeeFlow - Registered first in #getLayer1GasFeeFlows() to match before Optimism - Added MANTLE chain ID (0x1388) to constants - 8 unit tests covering conversion, operator fee, error handling
…stnet Add Mantle Sepolia (chain ID 0x138b) to MantleLayer1GasFeeFlow so the tokenRatio conversion applies to testnet transactions as well.
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Explanation
The existing
MantleLayer1GasFeeFlow(added in #8376) handles Mantle mainnet's custom L1 gas fee calculation, which multiplies the oracle's ETH-denominatedgetL1FeebytokenRatio()to convert to MNT. This PR extends that same flow to also support Mantle Sepolia testnet (chain ID0x138b/ 5003).The Sepolia oracle lives at the same OP Stack predeploy address (
0x420...000F) and exposes the same ABI (getL1Fee,tokenRatio,getOperatorFee). No new logic is needed -- the testnet chain ID is simply added to the existingMANTLE_CHAIN_IDSarray so the flow matches both networks.On-chain verification confirms:
getL1Fee(bytes)works on both mainnet and SepoliatokenRatio()works on both (mainnet: 3232, Sepolia: 3234)getOperatorFee(uint256)reverts on mainnet (handled gracefully, defaults to 0) and works on SepoliaChanges
constants.tsMANTLE_SEPOLIA: '0x138b'MantleLayer1GasFeeFlow.tsCHAIN_IDS.MANTLE_SEPOLIAtoMANTLE_CHAIN_IDSarrayMantleLayer1GasFeeFlow.test.tsCHANGELOG.mdReferences
https://rpc.sepolia.mantle.xyzChecklist