I am a chomu in the digital world.

Head of Product @Juno in  the physical world. 

Introducing Permissionless Swap

What if the sequencer was down, or was blocking you from interacting with a token via a swap etc (take the soneium example for instance), over the weekend @chomu and I worked on a public good that lets you swap ETH with a L2 token directly from mainnet in a permission less manner.

How does this work?

Every standard L2 which is built on top of OP stack chain has the ability to force a transaction via the “depositTransaction” function in the OptimismPortal contract, this essentially lets you force a txn from L1 to bypass sequencer censorship

Deposit txn: https://etherscan.io/tx/0xac1d124a3a98cf70a0c99b82e1918225a78688ed98ae12b22a7942c3c9e380f5

Swap txn: https://basescan.org/tx/0x9e07e54abaddcad8a3d53e7bda7f91769a49b26671f0cecfe8a3a830212b05b1

We built a simple a POC, with a swap interface using 
@onchainkit swap components

FYI:
since its a POC currently it only supports swap for one (doginme) on @base ,
 
We plan to add support for more tokens and support or other L2s which is built on top of @optimism stack

inspiration: https://x.com/VitalikButerin/status/1879560670150017068

POC: https://permissionless-swap.vercel.app/

We first start by receiving a quote using Uniswap’s QuoterV2 contract to displaying the amountOut value during a swap and parallely construct the calldata via Uniswap’s SwapRouter contract needed to be executed on the L2 after the deposit has been successfully done 
 
After that you craft the “depositTransaction” txn to be executed in L1 and execute it calling the L1 contract (OptimismPortal) for the particular L2 rollup