Add support for eth_blobBaseFee RPC endpoint

[acolytec3]

There's a new blobBaseFee RPC endpoint in the execution API specs and we should add support for it.

[holgerd77]

You've linked the Wormhole Airdrop (could be worse). 😂 😂 😂

[acolytec3]

You've linked the Wormhole Airdrop (could be worse). 😂 😂 😂

🤫 It's my secret master plan to get us free tokens!

[scorbajio]

Some resources:

• Add dencun eth_blobBaseFee and eth_feeHistory changes ethereum/go-ethereum#29139
• https://eips.ethereum.org/EIPS/eip-7516
• https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/cancun.md
• https://blog.ethereum.org/2024/02/27/dencun-mainnet-announcement

[roninjin10]

Nice came looking for this. I had no idea how to calculate the blob base fee.

[acolytec3]

It's a pretty trivial addition as we already have the code for it (I think in block). Just need to expose it via the rpc. I just need to take the time to build it out

[roninjin10]

Oh I see it does exist on block/common just not named baseFee

ethereumjs-monorepo/packages/block/src/header.ts

Line 623 in 1dceddf

getBlobGasPrice(): bigint {

[acolytec3]

@roninjin10 PR in flight. It's pretty trivial but might do some additional test cleanup before we merge. But this gives you an idea of how to implement it using our code if you want to add something similar in tevm.