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