Base Sepolia Denim activated — October 21, 2026

Denim activated on Base Sepolia on October 21, 2026, replacing Flashblocks with canonical 200ms blocks. Flashblocks subscriptions and the "pending" block tag no longer provide preconfirmation data on Sepolia. Use canonical blocks and state instead. Base Mainnet continues to use Flashblocks until its own Denim activation, which is targeting November 2026.

See the Denim migration steps.

Parameters

blockNumber/tag

string

REQUIRED

The block number in hexadecimal format or the string latest, earliest, pending, safe or finalized

transaction detail flag

boolean

REQUIRED

The method returns the full transaction objects when this value is true otherwise, it returns only the hashes of the transactions

Returns

object

object | null

A block object, or null when no block was found. The block object contains the following fields:

baseFeePerGas

string

(Optional) A string of the base fee encoded in hexadecimal format. Please note that this response field will not be included in a block requested before the EIP-1559 upgrade

difficulty

string

The integer of the difficulty for this block encoded as a hexadecimal

extraData

string

The “extra data” field of this block

gasLimit

string

The maximum gas allowed in this block encoded as a hexadecimal

gasUsed

string

The total used gas by all transactions in this block encoded as a hexadecimal

hash

string | null

The block hash of the requested block. null if pending

logsBloom

string | null

The bloom filter for the logs of the block. null if pending

miner

string

The address of the beneficiary to whom the mining rewards were given

mixHash

string

A string of a 256-bit hash encoded as a hexadecimal

nonce

string | null

The hash of the generated proof-of-work. null if pending

number

string | null

The block number of the requested block encoded as hexadecimal. null if pending

parentHash

string

The hash of the parent block

receiptsRoot

string

The root of the receipts trie of the block

sha3Uncles

string

The SHA3 of the uncles data in the block

size

string

The size of this block in bytes as an Integer value encoded as hexadecimal

stateRoot

string

The root of the final state trie of the block

timestamp

string

The UNIX timestamp for when the block was collated

totalDifficulty

string

The integer of the total difficulty of the chain until this block encoded as a hexadecimal

transactions

array

An array of transaction objects - please see eth_getTransactionByHash for exact shape

transactionsRoot

string

The root of the transaction trie of the block

uncles

array

An array of uncle hashes

Request

1
curl -X POST "https://docs-demo.base-mainnet.quiknode.pro/" \
2
  -H "Content-Type: application/json" \
3
  -d '{
4
  "jsonrpc": "2.0",
5
  "method": "eth_getBlockByNumber",
6
  "params": [
7
    "0x5F4E6",
8
    false
9
  ],
10
  "id": 1
11
}'

1
curl -X POST "https://docs-demo.base-mainnet.quiknode.pro/" \
2
  -H "Content-Type: application/json" \
3
  -d '{
4
  "jsonrpc": "2.0",
5
  "method": "eth_getBlockByNumber",
6
  "params": [
7
    "0x5F4E6",
8
    false
9
  ],
10
  "id": 1
11
}'

1
import { ethers } from "ethers";
2

3
async function main() {
4
    const provider = new ethers.JsonRpcProvider("https://docs-demo.base-mainnet.quiknode.pro/");
5
    const response = await provider.send("eth_getBlockByNumber", [
6
    "0x5F4E6",
7
    false
8
]);
9
    console.log(response);
10
}
11

12
main();

1
import { ethers } from "ethers";
2

3
async function main() {
4
    const provider = new ethers.JsonRpcProvider("https://docs-demo.base-mainnet.quiknode.pro/");
5
    const response = await provider.send("eth_getBlockByNumber", [
6
    "0x5F4E6",
7
    false
8
]);
9
    console.log(response);
10
}
11

12
main();

1
from web3 import Web3, HTTPProvider
2
w3 = Web3(HTTPProvider('https://docs-demo.base-mainnet.quiknode.pro/'))
3
response = w3.provider.make_request("eth_getBlockByNumber", ["0x5F4E6",False])
4
print(response)

1
from web3 import Web3, HTTPProvider
2
w3 = Web3(HTTPProvider('https://docs-demo.base-mainnet.quiknode.pro/'))
3
response = w3.provider.make_request("eth_getBlockByNumber", ["0x5F4E6",False])
4
print(response)

1
import { createPublicClient, http } from 'viem'
2

3
async function main() {
4
    const client = createPublicClient({
5
        transport: http('https://docs-demo.base-mainnet.quiknode.pro/')
6
    })
7

8
    const result = await client.request({
9
        method: 'eth_getBlockByNumber',
10
        params: [
11
          "0x5F4E6",
12
          false
13
        ]
14
    })
15

16
    console.log(result)
17
}
18

19
main()

1
import { createPublicClient, http } from 'viem'
2

3
async function main() {
4
    const client = createPublicClient({
5
        transport: http('https://docs-demo.base-mainnet.quiknode.pro/')
6
    })
7

8
    const result = await client.request({
9
        method: 'eth_getBlockByNumber',
10
        params: [
11
          "0x5F4E6",
12
          false
13
        ]
14
    })
15

16
    console.log(result)
17
}
18

19
main()

1
import { QuicknodeSdk } from '@quicknode/sdk'
2

3
const qn = new QuicknodeSdk({})
4

5
const result = await qn.rpc.call(
6
  'eth_getBlockByNumber',
7
  [
8
  "0x5F4E6",
9
  false
10
],
11
  undefined,
12
  'https://docs-demo.base-mainnet.quiknode.pro/'
13
)
14

15
console.log(result)

1
import { QuicknodeSdk } from '@quicknode/sdk'
2

3
const qn = new QuicknodeSdk({})
4

5
const result = await qn.rpc.call(
6
  'eth_getBlockByNumber',
7
  [
8
  "0x5F4E6",
9
  false
10
],
11
  undefined,
12
  'https://docs-demo.base-mainnet.quiknode.pro/'
13
)
14

15
console.log(result)

1
import asyncio
2
from quicknode_sdk import QuicknodeSdk, SdkFullConfig
3

4
async def main():
5
    qn = QuicknodeSdk(SdkFullConfig(api_key=None))
6
    result = await qn.rpc.call(
7
        "eth_getBlockByNumber",
8
        [
9
            "0x5F4E6",
10
            False
11
        ],
12
        endpoint_url="https://docs-demo.base-mainnet.quiknode.pro/",
13
    )
14
    print(result)
15

16
asyncio.run(main())

1
import asyncio
2
from quicknode_sdk import QuicknodeSdk, SdkFullConfig
3

4
async def main():
5
    qn = QuicknodeSdk(SdkFullConfig(api_key=None))
6
    result = await qn.rpc.call(
7
        "eth_getBlockByNumber",
8
        [
9
            "0x5F4E6",
10
            False
11
        ],
12
        endpoint_url="https://docs-demo.base-mainnet.quiknode.pro/",
13
    )
14
    print(result)
15

16
asyncio.run(main())

1
require "quicknode_sdk"
2

3
qn = QuicknodeSdk::SDK.from_config(api_key: nil)
4

5
result = qn.rpc.call(
6
  method: "eth_getBlockByNumber",
7
  params: [
8
    "0x5F4E6",
9
    false
10
  ],
11
  endpoint_url: "https://docs-demo.base-mainnet.quiknode.pro/"
12
)
13

14
puts result

1
require "quicknode_sdk"
2

3
qn = QuicknodeSdk::SDK.from_config(api_key: nil)
4

5
result = qn.rpc.call(
6
  method: "eth_getBlockByNumber",
7
  params: [
8
    "0x5F4E6",
9
    false
10
  ],
11
  endpoint_url: "https://docs-demo.base-mainnet.quiknode.pro/"
12
)
13

14
puts result

1
use quicknode_sdk::{QuicknodeSdk, SdkFullConfig};
2

3
#[tokio::main]
4
async fn main() -> Result<(), Box<dyn std::error::Error>> {
5
    let qn = QuicknodeSdk::new(&SdkFullConfig::keyless())?;
6
    let result = qn
7
        .rpc
8
        .call(
9
            "eth_getBlockByNumber",
10
            Some(serde_json::json!([
11
    "0x5F4E6",
12
    false
13
])),
14
            None,
15
            Some("https://docs-demo.base-mainnet.quiknode.pro/".into()),
16
        )
17
        .await?;
18

19
    println!("{result}");
20
    Ok(())
21
}

1
use quicknode_sdk::{QuicknodeSdk, SdkFullConfig};
2

3
#[tokio::main]
4
async fn main() -> Result<(), Box<dyn std::error::Error>> {
5
    let qn = QuicknodeSdk::new(&SdkFullConfig::keyless())?;
6
    let result = qn
7
        .rpc
8
        .call(
9
            "eth_getBlockByNumber",
10
            Some(serde_json::json!([
11
    "0x5F4E6",
12
    false
13
])),
14
            None,
15
            Some("https://docs-demo.base-mainnet.quiknode.pro/".into()),
16
        )
17
        .await?;
18

19
    println!("{result}");
20
    Ok(())
21
}

1
const body = {
2
    jsonrpc: '2.0',
3
    method: 'eth_getBlockByNumber',
4
    params: ["0x5F4E6",false],
5
    id: 1
6
}
7

8
async function main() {
9
    const response = await fetch('https://docs-demo.base-mainnet.quiknode.pro/', {
10
        method: 'POST',
11
        headers: {'Content-Type': 'application/json'},
12
        body: JSON.stringify(body)
13
    })
14
    const data = await response.json()
15
    console.log(data)
16
}
17

18
main()

1
const body = {
2
    jsonrpc: '2.0',
3
    method: 'eth_getBlockByNumber',
4
    params: ["0x5F4E6",false],
5
    id: 1
6
}
7

8
async function main() {
9
    const response = await fetch('https://docs-demo.base-mainnet.quiknode.pro/', {
10
        method: 'POST',
11
        headers: {'Content-Type': 'application/json'},
12
        body: JSON.stringify(body)
13
    })
14
    const data = await response.json()
15
    console.log(data)
16
}
17

18
main()

1
import requests
2
import json
3

4
url = "https://docs-demo.base-mainnet.quiknode.pro/"
5

6
payload = json.dumps({
7
  "jsonrpc": "2.0",
8
  "method": "eth_getBlockByNumber",
9
  "params": [
10
    "0x5F4E6",
11
    False
12
  ],
13
  "id": 1
14
})
15
headers = {
16
  'Content-Type': 'application/json'
17
}
18

19
response = requests.request("POST", url, headers=headers, data=payload)
20

21
print(response.text)

1
import requests
2
import json
3

4
url = "https://docs-demo.base-mainnet.quiknode.pro/"
5

6
payload = json.dumps({
7
  "jsonrpc": "2.0",
8
  "method": "eth_getBlockByNumber",
9
  "params": [
10
    "0x5F4E6",
11
    False
12
  ],
13
  "id": 1
14
})
15
headers = {
16
  'Content-Type': 'application/json'
17
}
18

19
response = requests.request("POST", url, headers=headers, data=payload)
20

21
print(response.text)

1
require "uri"
2
require "json"
3
require "net/http"
4

5
uri = URI("https://docs-demo.base-mainnet.quiknode.pro/")
6

7
payload = {
8
  jsonrpc: "2.0",
9
  id: 1,
10
  method: "eth_getBlockByNumber",
11
  params: ["0x5F4E6",false]
12
}
13

14
request = Net::HTTP::Post.new(uri)
15
request["Content-Type"] = "application/json"
16
request.body = JSON.generate(payload)
17

18
response = Net::HTTP.start(uri.host, uri.port, use_ssl: true) do |http|
19
  http.request(request)
20
end
21

22
puts response.body

1
require "uri"
2
require "json"
3
require "net/http"
4

5
uri = URI("https://docs-demo.base-mainnet.quiknode.pro/")
6

7
payload = {
8
  jsonrpc: "2.0",
9
  id: 1,
10
  method: "eth_getBlockByNumber",
11
  params: ["0x5F4E6",false]
12
}
13

14
request = Net::HTTP::Post.new(uri)
15
request["Content-Type"] = "application/json"
16
request.body = JSON.generate(payload)
17

18
response = Net::HTTP.start(uri.host, uri.port, use_ssl: true) do |http|
19
  http.request(request)
20
end
21

22
puts response.body

Response

1
{
2
  "jsonrpc": "2.0",
3
  "id": 1,
4
  "result": {
5
    "baseFeePerGas": "0x32",
6
    "difficulty": "0x0",
7
    "extraData": "0x",
8
    "gasLimit": "0x1c9c380",
9
    "gasUsed": "0xb741",
10
    "hash": "0x8125d2cdb126d1eb9c40bd3a3a1c00633d5698c0af4dfa90ef2ad32ba81b6f52",
11
    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
12
    "miner": "0x4200000000000000000000000000000000000011",
13
    "mixHash": "0x0cd96a684fdaa2d0b9baf184419526ad720e701bae1855f34b7d535b1f65f9f5",
14
    "nonce": "0x0000000000000000",
15
    "number": "0x5f4e6",
16
    "parentHash": "0xd3014621a2c99724341184e6c32fe641d54b174353cd2bc8c83a0372171f0ef0",
17
    "receiptsRoot": "0x3f71ebd8822765e8146170b0f930f55f753dbb867f55e4e605894016cd32f1e2",
18
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
19
    "size": "0x365",
20
    "stateRoot": "0x3151cd56c2daaa3adb8f61bc91071dbe245ee5082da3c158f9326d21f929d0df",
21
    "timestamp": "0x649646af",
22
    "transactions": [
23
      "0x2d3750f7944818e1a4e6b897b6f6ea4d975fcf46720990eb4eda0c00d926a8fd"
24
    ],
25
    "transactionsRoot": "0xde72c21eee913cab906890d872c55c8a37845fb6a593760936e8a5204667f9a3",
26
    "uncles": []
27
  }
28
}

1
{
2
  "jsonrpc": "2.0",
3
  "id": 1,
4
  "result": {
5
    "baseFeePerGas": "0x32",
6
    "difficulty": "0x0",
7
    "extraData": "0x",
8
    "gasLimit": "0x1c9c380",
9
    "gasUsed": "0xb741",
10
    "hash": "0x8125d2cdb126d1eb9c40bd3a3a1c00633d5698c0af4dfa90ef2ad32ba81b6f52",
11
    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
12
    "miner": "0x4200000000000000000000000000000000000011",
13
    "mixHash": "0x0cd96a684fdaa2d0b9baf184419526ad720e701bae1855f34b7d535b1f65f9f5",
14
    "nonce": "0x0000000000000000",
15
    "number": "0x5f4e6",
16
    "parentHash": "0xd3014621a2c99724341184e6c32fe641d54b174353cd2bc8c83a0372171f0ef0",
17
    "receiptsRoot": "0x3f71ebd8822765e8146170b0f930f55f753dbb867f55e4e605894016cd32f1e2",
18
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
19
    "size": "0x365",
20
    "stateRoot": "0x3151cd56c2daaa3adb8f61bc91071dbe245ee5082da3c158f9326d21f929d0df",
21
    "timestamp": "0x649646af",
22
    "transactions": [
23
      "0x2d3750f7944818e1a4e6b897b6f6ea4d975fcf46720990eb4eda0c00d926a8fd"
24
    ],
25
    "transactionsRoot": "0xde72c21eee913cab906890d872c55c8a37845fb6a593760936e8a5204667f9a3",
26
    "uncles": []
27
  }
28
}

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