eth_sendRawTransactionConditional L2 RPC endpoint

[hamdiallam]

Describe the feature

The eth_sendRawTransactionConditional endpoint is implemented in op-geth and live on OPM. This endpoint is becoming a blocked for broader 4337 adoption on chains like Base as op-reth is used in production.

We should get this implemented in this client as well. See the diff in 4337 improvements

1. Conditional type, checks against header & state
2. Sequencer RPC. (ratelimit, conditional check prior to mempool submission)
3. Conditional checks prior to block inclusion when blockbuilding
4. Tx Rejection -> Rejection from mempool as well
5. Filter from p2p tx gossip

Although (5) filters conditional txs from p2p gossip, this will be implemented as a followup between op-geth/op-reth to remove the need for a broadcast to all possible block builders

Additional context

Related op-geth PRs:

• feat: eth_sendRawTransactionConditional ethereum-optimism/op-geth#330
• internal/sequencerapi,miner: move conditional rate limiter to the rpc layer instead of miner ethereum-optimism/op-geth#377
• core/types: transaction conditional KnownAccounts fix && HexOrDecimal deser ethereum-optimism/op-geth#414

[oac1771]

Hello! Can I take this if it is still available?

[hamdiallam]

@oac1771 yes! feel free to take a stab at it

[mattsse]

@oac1771 since this an optimism specific extension I'd like to add the API trait to

https://github.com/alloy-rs/op-alloy/blob/b756ac9a5088813dd52eb7cebfce79ed351112f1/crates/rpc-jsonrpsee/src/traits.rs#L139-L142

like OpEthApiExt

[mattsse]

we already have the conditonal options type alloy-rs/alloy#1823

[yoavw]

@oac1771 since this an optimism specific extension I'd like to add the API trait to

https://github.com/alloy-rs/op-alloy/blob/b756ac9a5088813dd52eb7cebfce79ed351112f1/crates/rpc-jsonrpsee/src/traits.rs#L139-L142

like OpEthApiExt

ERC-7796 (eth_sendRawTransactionConditional) is not optimism specific. Supported by other chains such as Arbitrum and Polygon. It'll be relevant for other rollups that use reth.

[mattsse]

I see, then we can add the extension trait to alloy's rpc-api crate instead