RPC method

eth_getBlockByNumber on Hemi

Supported on SwiftNodes

Everything below was measured on 2026-10-13 by calling eth_getBlockByNumber on Hemi 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 Hemi: what we measured

Header fields	26
Transactions per block	1, 1, 1, 1, 1 in five consecutive blocks
Response size, full transactions (true)	2.6 KB average
Response size, hashes only (false)	1.8 KB
Gas limit	30,000,000
Gas used in the latest block	54,544 (0.182% of the limit)
Base fee	252 wei
Tag "safe"	block 5,502,470
Tag "finalized"	block 5,502,355
Tag "pending"	block 5,502,483
Tag "earliest"	block 0

What is different on Hemi

The header includes the fields added by London (EIP-1559 base fee), Shanghai (withdrawals), Cancun (EIP-4844 blob gas), Cancun (EIP-4788 beacon root), Prague (EIP-7685 requests). Code that assumes Ethereum's current header shape will parse it as is.

5 of the 5 transactions in those five blocks were system transactions (5 × type 0x7e, L1-to-L2 deposit (OP Stack)). They are not user activity: filter them out when counting transactions.

"finalized" was 128 blocks (about 26 min) behind the head.

A real Hemi block header

From block 5,502,482, as our endpoint returned it (long hex values shortened).

{
  "baseFeePerGas": "0xfc",
  "blobGasUsed": "0x0",
  "difficulty": "0x0",
  "excessBlobGas": "0x0",
  "extraData": "0x00000000fa00000006",
  "gasLimit": "0x1c9c380",
  "gasUsed": "0xd510",
  "hash": "0x30542907fec9ca083ed15185d941704e1644f78ed640bd833d48a6d7350eae5d",
  "logsBloom": "0x0000000000000000…(256 bytes)",
  "miner": "0x4200000000000000000000000000000000000011",
  "mixHash": "0x582c223268359d46e9d5729201edae8e44d2c2913cdac08a93edb3e1084f90ac",
  "nonce": "0x0000000000000000",
  "number": "0x53f612",
  "parentBeaconBlockRoot": "0x8fa566c50aa078d99fea293dd8cf3f62f7e6d018af12688c82ba15a1e3b15919",
  "parentHash": "0x80b2b4f815a11445fddca08ac86e7a05953e6f8caa1240eba1231ec371b856c6",
  "receiptsRoot": "0xb687cebe53776837633e62eebb0bd6e7c0561689a40f6d22ca038c1c870fd34e",
  "requestsHash": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "size": "0x380",
  "stateRoot": "0xe82f8b820061ec15303e24bb8e49fcb87d24e0ca6fd587a10907ec3a787472e1",
  "timestamp": "0x6ace2baf",
  "transactions": "1 transactions",
  "transactionsRoot": "0x35a874912635495014f1109479dbde1ad80bb0fc862effca98ad52deee525a97",
  "uncles": [],
  "withdrawals": [],
  "withdrawalsRoot": "0xe2c89434db986a4866409826aa1c79e701b20b2753f314e75c1a0a5131675c0f"
}

Example request

curl -s https://rpc.swiftnodes.io/rpc/hemi?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/hemi?key=YOUR_API_KEY"),
});

// Header plus transaction hashes (1.8 KB)
const block = await client.getBlock({ blockTag: "latest" });

// With full transactions (2.6 KB on average on Hemi)
const full = await client.getBlock({ blockNumber: block.number, includeTransactions: true });
const userTxs = full.transactions.filter((t) => !["0x7e"].includes(t.typeHex));

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

Other methods on Hemi

eth_getBlockByNumber on other chains

Frequently asked questions

Does Hemi support eth_getBlockByNumber?

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

How many transactions are in each Hemi block?

In five consecutive blocks on 2026-10-13: 1, 1, 1, 1, 1.

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

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