The wrong fee is estimated for Base and Opt networks on send/bridge/swap

[VolodLytvynenko]

More context here

Steps to reproduce:

1. Navigate to the Send Setup page.
2. Build a transaction route.

Actual result:

The estimated maximum fee is always displayed as <0.01 USD.
However, after the transaction is performed, the actual fee is 0.1 USD.

send: https://basescan.org/tx/0xd0347976e2f41cc81c6a64e07650dca0746d24c487cb2e9c56dbaa6d6c0bfedd

send: https://basescan.org/tx/0xa7f093829962f8b3f7604d97b3818dc504d4dccbde363a49e56372f3ac453094

swap: https://basescan.org/tx/0x2df5a010af3754db7349909138d60f117de21a3de4aeabcf59557bb512321d41

Expected result:

The estimated maximum fee should accurately reflect the actual transaction fee (e.g., 0.1 USD).

ADDITIONAL INFO

The same issue happened for the Optimism network

https://optimistic.etherscan.io/tx/0x48aa2b2baf75c864e384789f56d46bceb5c2c18e1c7490e10790f93b6b73f254

[alwx]

Isn't it a very similar issue? #21620

[VolodLytvynenko]

Isn't it a very similar issue? #21620

@alwx Unfortunately, this is another case of incorrect fee estimation. In the first issue (#21620), the root cause is that the "bridge fee" and "approval fee" are not included for bridge transactions.

In the current issue, the mobile app calculates fees incorrectly for all types of transactions (swap/send/bridge) on the Optimism and Base networks. This happens because l1GasFee from SuggestedFees is used instead of TxL1Fee and ApprovalL1Fee, as mentioned here.

It would be great to fix both issues in a single PR if possible