Transaction Types

Which Ethereum transaction types are supported on Sei

Transaction Types

Sei supports most Ethereum transaction types. The one notable exception is blob transactions.

Supported Types

Type	EIP	Name	Sei support
0	—	Legacy	Supported — governance-set minimum gas price applies
1	EIP-2930	Access list	Supported
2	EIP-1559	Fee market	Supported — base fee is not burned
4	EIP-7702	Set code	Supported

Not Supported

Type	EIP	Name	Notes
3	EIP-4844	Blob	Not supported — Sei runs Pectra without blob transactions

Blob Transactions

Sei runs the Pectra hardfork without blob transaction support. Attempting to send a type 3 transaction will be rejected at the RPC level.

If you are porting code from Ethereum that uses blob transactions (e.g. rollup data availability), that path does not apply to Sei.

Sending Transactions

Standard library defaults work correctly. viem, wagmi, and ethers all default to type 2 (EIP-1559) transactions on chains that support it, which Sei does.

viem

import { createWalletClient, http, parseEther } from 'viem';
import { privateKeyToAccount } from 'viem/accounts';
import { sei } from '@sei-js/precompiles/viem';

const account = privateKeyToAccount('0xYourPrivateKey');
const client = createWalletClient({ account, chain: sei, transport: http() });

// Sends a type 2 transaction — correct default for Sei
const hash = await client.sendTransaction({
  to: '0xRecipient',
  value: parseEther('1'),
});