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Abhishek Yadav
@abhixh
How do you calculate maxFeePerGas on Scroll and Mantle because they do not return maxFeePerGas and maxPriorityFeePerGas when fetching fee data?
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Steve
@stevedylandev.eth
Following this one; I haven’t been able to use scroll reliably on testnet so far :(
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Abhishek Yadav
@abhixh
Figured how to make it work on Scroll, Mantle not yet.
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Steve
@stevedylandev.eth
What’s the key?? 👀👀
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Abhishek Yadav
@abhixh
Started with the bare basics: maxFeePerGas = baseFeePerGas + maxPriorityFeePerGas if we know the two right hand side variables then we can calculate maxFeePerGas.
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Abhishek Yadav
@abhixh
The problem was since the RPC doesn’t return any value it’s difficult to even estimate baseFeePerGas which should be of the preceding block.
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Abhishek Yadav
@abhixh
But the network is live and blocks are being processed which means it’s the RPC that’s at fault. We decided to fetch baseFeePerGas from a different method. This was interesting https://github.com/ethers-io/ethers.js/discussions/3601
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Abhishek Yadav
@abhixh
“it simply multiplies the base fee by 2 and then adds the miner’s tip (maxPriorityFeePerGas)” Since the networks are actually working lastBaseFeePerGas cannot be null. Or unless the RPCs do not have a way to deconstruct the original equation and get the different values back.
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Abhishek Yadav
@abhixh
So we decided to do it ourselves. We could parse this data directly and recreate the equation on our own and then submit it. Worked for Scroll at 1.5x. Failed for Mantle even at 2x which means we need a different equation and this won’t work.
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Abhishek Yadav
@abhixh
Turns out Mantle doesn’t have support for 1559 yet. Hence, the problem. We should send legacy transactions with gasFee only.
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