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Transaction Types

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

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Supported Types

TypeEIPNameSei support
0—LegacySupported — governance-set minimum gas price applies
1EIP-2930Access listSupported
2EIP-1559Fee marketSupported — base fee is not burned
4EIP-7702Set codeSupported

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Not Supported

TypeEIPNameNotes
3EIP-4844BlobNot supported — Sei runs Pectra without blob transactions

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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.

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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. 
import { createWalletClient, http, parseEther } from 'viem';
import { privateKeyToAccount } from 'viem/accounts';
import { sei } from 'viem/chains';

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'),
});