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

transaction

object

REQUIRED

The transaction call object:

from

string

The address from which the transaction is sent

to

string

REQUIRED

The address to which the transaction is addressed

gas

integer

The integer of gas provided for the transaction execution

gasPrice

integer

The integer of gasPrice used for each paid gas encoded as hexadecimal

value

integer

The integer of value sent with this transaction encoded as hexadecimal

data

string

The hash of the method signature and encoded parameters. For more information, see the Contract ABI description in the Solidity documentation.

blockNumber

string

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

Returns

quantity

The estimated amount of gas used

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_estimateGas",
6
  "params": [
7
    {
8
      "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
9
      "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
10
      "value": "0x186a0"
11
    }
12
  ],
13
  "id": 1
14
}'

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_estimateGas",
6
  "params": [
7
    {
8
      "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
9
      "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
10
      "value": "0x186a0"
11
    }
12
  ],
13
  "id": 1
14
}'

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_estimateGas", [
6
    {
7
        "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
8
        "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
9
        "value": "0x186a0"
10
    }
11
]);
12
    console.log(response);
13
}
14

15
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_estimateGas", [
6
    {
7
        "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
8
        "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
9
        "value": "0x186a0"
10
    }
11
]);
12
    console.log(response);
13
}
14

15
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_estimateGas", [{"from":"0x8D97689C9818892B700e27F316cc3E41e17fBeb9","to":"0xd3CdA913deB6f67967B99D67aCDFa1712C293601","value":"0x186a0"}])
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_estimateGas", [{"from":"0x8D97689C9818892B700e27F316cc3E41e17fBeb9","to":"0xd3CdA913deB6f67967B99D67aCDFa1712C293601","value":"0x186a0"}])
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_estimateGas',
10
        params: [
11
          {
12
            "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
13
            "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
14
            "value": "0x186a0"
15
          }
16
        ]
17
    })
18

19
    console.log(result)
20
}
21

22
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_estimateGas',
10
        params: [
11
          {
12
            "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
13
            "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
14
            "value": "0x186a0"
15
          }
16
        ]
17
    })
18

19
    console.log(result)
20
}
21

22
main()

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

3
const qn = new QuicknodeSdk({})
4

5
const result = await qn.rpc.call(
6
  'eth_estimateGas',
7
  [
8
  {
9
    "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
10
    "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
11
    "value": "0x186a0"
12
  }
13
],
14
  undefined,
15
  'https://docs-demo.base-mainnet.quiknode.pro/'
16
)
17

18
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_estimateGas',
7
  [
8
  {
9
    "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
10
    "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
11
    "value": "0x186a0"
12
  }
13
],
14
  undefined,
15
  'https://docs-demo.base-mainnet.quiknode.pro/'
16
)
17

18
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_estimateGas",
8
        [
9
            {
10
                "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
11
                "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
12
                "value": "0x186a0"
13
            }
14
        ],
15
        endpoint_url="https://docs-demo.base-mainnet.quiknode.pro/",
16
    )
17
    print(result)
18

19
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_estimateGas",
8
        [
9
            {
10
                "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
11
                "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
12
                "value": "0x186a0"
13
            }
14
        ],
15
        endpoint_url="https://docs-demo.base-mainnet.quiknode.pro/",
16
    )
17
    print(result)
18

19
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_estimateGas",
7
  params: [
8
    {
9
      "from" => "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
10
      "to" => "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
11
      "value" => "0x186a0"
12
    }
13
  ],
14
  endpoint_url: "https://docs-demo.base-mainnet.quiknode.pro/"
15
)
16

17
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_estimateGas",
7
  params: [
8
    {
9
      "from" => "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
10
      "to" => "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
11
      "value" => "0x186a0"
12
    }
13
  ],
14
  endpoint_url: "https://docs-demo.base-mainnet.quiknode.pro/"
15
)
16

17
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_estimateGas",
10
            Some(serde_json::json!([
11
    {
12
        "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
13
        "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
14
        "value": "0x186a0"
15
    }
16
])),
17
            None,
18
            Some("https://docs-demo.base-mainnet.quiknode.pro/".into()),
19
        )
20
        .await?;
21

22
    println!("{result}");
23
    Ok(())
24
}

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_estimateGas",
10
            Some(serde_json::json!([
11
    {
12
        "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
13
        "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
14
        "value": "0x186a0"
15
    }
16
])),
17
            None,
18
            Some("https://docs-demo.base-mainnet.quiknode.pro/".into()),
19
        )
20
        .await?;
21

22
    println!("{result}");
23
    Ok(())
24
}

1
const body = {
2
    jsonrpc: '2.0',
3
    method: 'eth_estimateGas',
4
    params: [{"from":"0x8D97689C9818892B700e27F316cc3E41e17fBeb9","to":"0xd3CdA913deB6f67967B99D67aCDFa1712C293601","value":"0x186a0"}],
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_estimateGas',
4
    params: [{"from":"0x8D97689C9818892B700e27F316cc3E41e17fBeb9","to":"0xd3CdA913deB6f67967B99D67aCDFa1712C293601","value":"0x186a0"}],
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_estimateGas",
9
  "params": [
10
    {
11
      "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
12
      "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
13
      "value": "0x186a0"
14
    }
15
  ],
16
  "id": 1
17
})
18
headers = {
19
  'Content-Type': 'application/json'
20
}
21

22
response = requests.request("POST", url, headers=headers, data=payload)
23

24
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_estimateGas",
9
  "params": [
10
    {
11
      "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
12
      "to": "0xd3CdA913deB6f67967B99D67aCDFa1712C293601",
13
      "value": "0x186a0"
14
    }
15
  ],
16
  "id": 1
17
})
18
headers = {
19
  'Content-Type': 'application/json'
20
}
21

22
response = requests.request("POST", url, headers=headers, data=payload)
23

24
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_estimateGas",
11
  params: [{"from":"0x8D97689C9818892B700e27F316cc3E41e17fBeb9","to":"0xd3CdA913deB6f67967B99D67aCDFa1712C293601","value":"0x186a0"}]
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_estimateGas",
11
  params: [{"from":"0x8D97689C9818892B700e27F316cc3E41e17fBeb9","to":"0xd3CdA913deB6f67967B99D67aCDFa1712C293601","value":"0x186a0"}]
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": "0x5208"
5
}

1
{
2
  "jsonrpc": "2.0",
3
  "id": 1,
4
  "result": "0x5208"
5
}

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