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RPC method

eth_getBlockByNumber on Sei

Supported on SwiftNodes

Everything below was measured on 2026-10-13 by calling eth_getBlockByNumber on Sei through the same endpoint customers use, and is re-measured weekly.

What eth_getBlockByNumber does

Returns a block by number or tag (latest, safe, finalized, pending, earliest): the header, and either the transaction hashes or the full transactions. Indexers, explorers and wallets use it to follow the chain.

eth_getBlockByNumber on Sei: what we measured

Header fields21
Transactions per block0, 0 in five consecutive blocks
Response size, full transactions (true)1.4 KB average
Response size, hashes only (false)1.4 KB
Gas limit12,500,000
Gas used in the latest block0 (0.000% of the limit)
Base fee50.00 gwei
Tag "safe"block 237,364,986
Tag "finalized"block 237,364,989
Tag "pending"block 237,364,993
Tag "earliest"block 0

What is different on Sei

The header includes the fields added by London (EIP-1559 base fee), but not those of Shanghai (withdrawals), Cancun (EIP-4844 blob gas), Cancun (EIP-4788 beacon root), Prague (EIP-7685 requests). Code that assumes Ethereum's current header shape must treat the missing ones as optional.

A real Sei block header

From block 237,364,964, as our endpoint returned it (long hex values shortened).

{
  "baseFeePerGas": "0xba43b7400",
  "difficulty": "0x0",
  "extraData": "0x",
  "gasLimit": "0xbebc20",
  "gasUsed": "0x0",
  "hash": "0x62c9142eae91de8a750fd5037fd0f7121aeb5e6e0147df57c278ade49f3b1f95",
  "logsBloom": "0x0000000000000000…(256 bytes)",
  "miner": "0x7482d68a8c68fd7204273223d90864207b1558b5",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "nonce": "0x0000000000000000",
  "number": "0xe25e6e4",
  "parentHash": "0x67163d0c968c4c66635af2acc8644b84fcef8e0bd134947e05a4249dcbff9114",
  "receiptsRoot": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "size": "0x127a",
  "stateRoot": "0x02d58015616f42ad91be383c9dfc8d1ddcc4658500ce41ddbb21289243c6ebf1",
  "timestamp": "0x6ace2dcc",
  "totalDifficulty": "0x0",
  "transactions": "0 transactions",
  "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
  "uncles": []
}

Example request

curl -s https://rpc.swiftnodes.io/rpc/sei?key=YOUR_API_KEY \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getBlockByNumber","params":["latest",false]}'
import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://rpc.swiftnodes.io/rpc/sei?key=YOUR_API_KEY"),
});

// Header plus transaction hashes (1.4 KB)
const block = await client.getBlock({ blockTag: "latest" });

// With full transactions (1.4 KB on average on Sei)
const full = await client.getBlock({ blockNumber: block.number, includeTransactions: true });

// A block that will not be reorganised
const final = await client.getBlock({ blockTag: "finalized" });

Other methods on Sei

eth_getBlockByNumber on other chains

Frequently asked questions

Does Sei support eth_getBlockByNumber?

Yes. eth_getBlockByNumber answered on the SwiftNodes Sei endpoint when our weekly probe called it through the customer path (2026-10-13).

How many transactions are in each Sei block?

In five consecutive blocks on 2026-10-13: 0, 0.

Sei endpoints, live block height and WebSocket status are on the Sei RPC page.

One key covers every chain we serve, and SwiftNodes has a free tier.