RPC method

eth_getBlockByNumber on BOB

Supported on SwiftNodes

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

Header fields	26
Transactions per block	1, 1 in five consecutive blocks
Response size, full transactions (true)	2.7 KB average
Response size, hashes only (false)	1.8 KB
Gas limit	30,000,000
Gas used in the latest block	46,302 (0.154% of the limit)
Base fee	252 wei
Tag "safe"	block 39,516,968
Tag "finalized"	block 39,515,198
Tag "pending"	block 39,517,211
Tag "earliest"	block 0

What is different on BOB

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.

2 of the 2 transactions in those five blocks were system transactions (2 × type 0x7e, L1-to-L2 deposit (OP Stack)). They are not user activity: filter them out when counting transactions.

"finalized" was 2,011 blocks (about 67 min) behind the head.

A real BOB block header

From block 39,517,205, as our endpoint returned it (long hex values shortened).

{
  "baseFeePerGas": "0xfc",
  "blobGasUsed": "0x0",
  "difficulty": "0x0",
  "excessBlobGas": "0x0",
  "extraData": "0x01000000fa000000060000000000000000",
  "gasLimit": "0x1c9c380",
  "gasUsed": "0xb4de",
  "hash": "0xb4348a97255f77ea0b21bad2a4dde7878eb6f76b745437c842edcfd7ad1bc1f1",
  "logsBloom": "0x0000000000000000…(256 bytes)",
  "miner": "0x4200000000000000000000000000000000000011",
  "mixHash": "0x19b6c56b461b6986fed2fa0c1276a7a2ed5e155fdb8f6dc41c916cbcf25d46da",
  "nonce": "0x0000000000000000",
  "number": "0x25afc15",
  "parentBeaconBlockRoot": "0x23ccee0c1430745e5f06a53fcfb5554b7a6ead8a34ed1ee846d0a3b9565b4515",
  "parentHash": "0xd2829f2299a04ea1689b491cbf184e64c3e2d3b4bd9c84b8bc14c78b15dbfb60",
  "receiptsRoot": "0x1dffacd88ca66af8d6519079ebb539ee1bac1cc1f36a8e8288de34d66a53d335",
  "requestsHash": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "size": "0x38b",
  "stateRoot": "0x36456a7441589e53a10d44bf223d5635423bb133740839a5e896f51282727b38",
  "timestamp": "0x6ace2b4d",
  "transactions": "1 transactions",
  "transactionsRoot": "0x5f29906077e86790aec714d91b36b70c0f18e62bda31d1a877119330e24fd09c",
  "uncles": [],
  "withdrawals": [],
  "withdrawalsRoot": "0xcedc3d82a45efdf293c5f2654433146064d96b72710b13fd10f66cbbb2304c6d"
}

Example request

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

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

// With full transactions (2.7 KB on average on BOB)
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 BOB

eth_getBlockByNumber on other chains

Frequently asked questions

Does BOB support eth_getBlockByNumber?

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

How many transactions are in each BOB block?

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

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

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