Type 4 (EIP4337/ERC4337) not supported by etherjs v6

[kopax]

Describe the Feature

On Binance Smart Chain, I can now see new type of transaction, type 4.

This type was added recently after their latest fork: https://www.binance.com/en/square/post/03-07-2025-bnb-chain-3-20-pascal-21231944846273

This is the spec for type 4 : https://www.erc4337.io/docs

Since this type is not yet implemented, etherjs v6 will throw errors here:

ethers.js/src.ts/transaction/transaction.ts

Line 607 in 0195f44

assertArgument(false, "unsupported transaction type", "type", value);

Code Example

Example of transaction type 4 on BSC mainnet:

{
  "_type": "TransactionResponse",
  "accessList": [],
  "blockNumber": 47800830,
  "blockHash": "0x58deb47eae6a0211b837e35ff47a846724e3d205b8536a6fa98e9f03d7e45515",
  "blobVersionedHashes": null,
  "chainId": "56",
  "data": "0x",
  "from": "0x0c0C540895481084639Cd315e966BABcddb76777",
  "gasLimit": "1000000",
  "gasPrice": "1100000000",
  "hash": "0x94891985bbe85fd89c4f3fbf6a98ee18197d292c3d5e034477b9a4c44fe32cd3",
  "maxFeePerGas": "1100000000",
  "maxPriorityFeePerGas": "1100000000",
  "maxFeePerBlobGas": null,
  "nonce": 6643,
  "signature": {
    "_type": "signature",
    "networkV": null,
    "r": "0xbf78f482c34952c1e35d9f10a9995f4c34494b60dcce56ba651dad9e41e8278a",
    "s": "0x77c260be2e8c19377d12f5d42b1e989164e493617298e3c8a951b2cb48d2b139",
    "v": 27
  },
  "to": "0x0c0C540895481084639Cd315e966BABcddb76777",
  "index": 142,
  "type": 4,
  "value": "0"
}

[ricmoo]

Is this type = 4 tx equivalent to the EIP-7702 transaction type on Ethereum? Or is it a new type, specific only to BSC? Links to specification? :)

[kopax]

Is this type = 4 tx equivalent to the EIP-7702 transaction type on Ethereum? Or is it a new type, specific only to BSC? Links to specification? :)

The link where you can access the specification is in a link within my initial post, but here is a direct link: https://eips.ethereum.org/EIPS/eip-4337

This domain is owned by ethereum so I guess it is not specific to BSC

[kopax]

Hi @ricmoo! By any chance, did you had time to check on this? Could you tell if/when this will be pushed to backlog?

[ricmoo]

Right, I think you mean EIP-7702, which is supported in Ethers in the eip-7702 branch or using the beta-eip-7702 tag on npm.

I believe the current official release data for
Pectra (which includes 7702) on Ethereum Mainnet is May 8, which is when the support will be released in the latest npm release and merged into the main branch. Give or take. :)

Please try it out (and follow the EIP-7702 issues on GitHub) and let me know if you have any issues with it. :)