Add eth_blobBaseFee; add blobs to eth_feeHistory

[flcl42]

Blob gas price oracle and historical API

Makes sending blob more convenient. Notes and prototype

Add eth_blobBaseFee

A new method that returns blob gas price prediction

Update for eth_feeHistory

Add two fields related to blob gas

• Base fee per blob gas series
• Blob gas used ratio

[lightclient]

Thanks for this! The changes to eth_feeHistory look good, but I'm not sure about the new method eth_gasPrices.

[lightclient]

Another thought on eth_gasPrices, the value gasPrice is really a legacy value for legacy txs. I don't think we should be adding new methods using it.

[flcl42]

Another thought on eth_gasPrices, the value gasPrice is really a legacy value for legacy txs. I don't think we should be adding new methods using it.

is there a better way of calculating max_fee_per_gas for eip-1559 txs?

[w3github]

why is it yaml?

[flcl42]

@flcl42 @lightclient I am pro for adding gasPrice and maxPriorityFeePerGas value, libraries like ethers.js call eth_getBlock, eth_gasPrice and eth_maxPriorityFeePerGas to determine EIP-1559 compatible transaction fees and it would be great to have a call that would do it all ( See the code here https://github.com/ethers-io/ethers.js/pull/4463/files#diff-0cd3541ddf16280f37de4cee3b994f2f6c4e000568a37c919d5b1e62f74be872R902 )

Of course adding a dedicated RPC method for retrieving eth_blobGasPrice would be great as a backup.

Let's start with simpler approach and see how convenient may be to have just that separate method for now.

[flcl42]

why is it yaml?

Do you mean json might work better?

[lightclient]

is there a better way of calculating max_fee_per_gas for eip-1559 txs?

base fee of parent * small multiple like 1.25 + result of eth_maxPriorityFeePerGas

[ryanschneider]

lgtm! I asked on Discord but does the rename to "blob base fee" in ethereum/EIPs#8095 mean we need to update any other 4844 RPC field names (e.g. maxFeePerBlobGas, etc.). I cursory scan says no but wanted to mention it here in case I missed anything.

[jxom]

Curious what are the next steps for this PR?

[lightclient]

Should be ratio of blobGasUsed and the limit for blobs isn't defined in the api currently, but we can use same naming as the EIP which is "max blob gas per block".

[Rjected]

Both APIs look good, we should be able to support eth_blobBaseFee easily and already support the additional blob fields in feeHistory

[Gabriel-Trintinalia]

looks good!

[fvictorio]

I know this has been merged already, but I wonder why this method doesn't accept a block tag?