To use the eth_getFilterChanges method on the C-Chain, ensure that the end of your URL includes ext/bc/C/rpc.

Parameters

filter ID

string

REQUIRED

The filter id that is returned from eth_newFilter, eth_newBlockFilter or eth_newPendingTransactionFilter

Returns

array

array

An array of one of the following, depending on the filter type, or empty if there were no changes since the last poll:

eth_newBlockFilter

object

blockHash

string

The 32 byte hash of a block that meets your filter requirements

eth_newPendingTransactionFilter

object

transactionHash

string

The 32 byte hash of a transaction that meets your filter requirements

eth_newFilter

object

The 32 byte hash of a transaction that meets your filter requirements

address

string

An address from which this log originated

topics

array

An array of zero to four 32 Bytes DATA of indexed log arguments. In Solidity, the first topic is the hash of the signature of the event (e.g. Deposit(address, bytes32, uint256)), except you declare the event with the anonymous specifier

data

string

It contains one or more 32 Bytes non-indexed arguments of the log

blockNumber

string

The block number where this log was in. null when its a pending log

transactionHash

string

The hash of the transactions this log was created from. null when its a pending log

transactionIndex

string

The integer of the transaction's index position that the log was created from. null when it's a pending log

blockHash

string

The hash of the block where this log was in. null when its a pending log

logIndex

string

The integer of the log index position in the block. null when it's a pending log

removed

boolean

It is true when the log was removed due to a chain reorganization, and false if it's a valid log

Request

1
curl -X POST "https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/" \
2
  -H "Content-Type: application/json" \
3
  -d '{
4
  "jsonrpc": "2.0",
5
  "method": "eth_getFilterChanges",
6
  "params": [
7
    "YOUR_FILTER_ID"
8
  ],
9
  "id": 1
10
}'

1
curl -X POST "https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/" \
2
  -H "Content-Type: application/json" \
3
  -d '{
4
  "jsonrpc": "2.0",
5
  "method": "eth_getFilterChanges",
6
  "params": [
7
    "YOUR_FILTER_ID"
8
  ],
9
  "id": 1
10
}'

1
import { ethers } from "ethers";
2

3
async function main() {
4
    const provider = new ethers.JsonRpcProvider("https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/");
5
    const response = await provider.send("eth_getFilterChanges", [
6
    "YOUR_FILTER_ID"
7
]);
8
    console.log(response);
9
}
10

11
main();

1
import { ethers } from "ethers";
2

3
async function main() {
4
    const provider = new ethers.JsonRpcProvider("https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/");
5
    const response = await provider.send("eth_getFilterChanges", [
6
    "YOUR_FILTER_ID"
7
]);
8
    console.log(response);
9
}
10

11
main();

1
from web3 import Web3, HTTPProvider
2
w3 = Web3(HTTPProvider('https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/'))
3
response = w3.provider.make_request("eth_getFilterChanges", ["YOUR_FILTER_ID"])
4
print(response)

1
from web3 import Web3, HTTPProvider
2
w3 = Web3(HTTPProvider('https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/'))
3
response = w3.provider.make_request("eth_getFilterChanges", ["YOUR_FILTER_ID"])
4
print(response)

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

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

8
    const result = await client.request({
9
        method: 'eth_getFilterChanges',
10
        params: [
11
          "YOUR_FILTER_ID"
12
        ]
13
    })
14

15
    console.log(result)
16
}
17

18
main()

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

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

8
    const result = await client.request({
9
        method: 'eth_getFilterChanges',
10
        params: [
11
          "YOUR_FILTER_ID"
12
        ]
13
    })
14

15
    console.log(result)
16
}
17

18
main()

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

3
const qn = new QuicknodeSdk({})
4

5
const result = await qn.rpc.call(
6
  'eth_getFilterChanges',
7
  [
8
  "YOUR_FILTER_ID"
9
],
10
  undefined,
11
  'https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/'
12
)
13

14
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_getFilterChanges',
7
  [
8
  "YOUR_FILTER_ID"
9
],
10
  undefined,
11
  'https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/'
12
)
13

14
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_getFilterChanges",
8
        [
9
            "YOUR_FILTER_ID"
10
        ],
11
        endpoint_url="https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/",
12
    )
13
    print(result)
14

15
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_getFilterChanges",
8
        [
9
            "YOUR_FILTER_ID"
10
        ],
11
        endpoint_url="https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/",
12
    )
13
    print(result)
14

15
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_getFilterChanges",
7
  params: [
8
    "YOUR_FILTER_ID"
9
  ],
10
  endpoint_url: "https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/"
11
)
12

13
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_getFilterChanges",
7
  params: [
8
    "YOUR_FILTER_ID"
9
  ],
10
  endpoint_url: "https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/"
11
)
12

13
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_getFilterChanges",
10
            Some(serde_json::json!([
11
    "YOUR_FILTER_ID"
12
])),
13
            None,
14
            Some("https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/".into()),
15
        )
16
        .await?;
17

18
    println!("{result}");
19
    Ok(())
20
}

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_getFilterChanges",
10
            Some(serde_json::json!([
11
    "YOUR_FILTER_ID"
12
])),
13
            None,
14
            Some("https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/".into()),
15
        )
16
        .await?;
17

18
    println!("{result}");
19
    Ok(())
20
}

1
const body = {
2
    jsonrpc: '2.0',
3
    method: 'eth_getFilterChanges',
4
    params: ["YOUR_FILTER_ID"],
5
    id: 1
6
}
7

8
async function main() {
9
    const response = await fetch('https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/', {
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_getFilterChanges',
4
    params: ["YOUR_FILTER_ID"],
5
    id: 1
6
}
7

8
async function main() {
9
    const response = await fetch('https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/', {
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.flare-mainnet.quiknode.pro/ext/bc/C/rpc/"
5

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

18
response = requests.request("POST", url, headers=headers, data=payload)
19

20
print(response.text)

1
import requests
2
import json
3

4
url = "https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/"
5

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

18
response = requests.request("POST", url, headers=headers, data=payload)
19

20
print(response.text)

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

5
uri = URI("https://docs-demo.flare-mainnet.quiknode.pro/ext/bc/C/rpc/")
6

7
payload = {
8
  jsonrpc: "2.0",
9
  id: 1,
10
  method: "eth_getFilterChanges",
11
  params: ["YOUR_FILTER_ID"]
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.flare-mainnet.quiknode.pro/ext/bc/C/rpc/")
6

7
payload = {
8
  jsonrpc: "2.0",
9
  id: 1,
10
  method: "eth_getFilterChanges",
11
  params: ["YOUR_FILTER_ID"]
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
    {
6
      "logIndex": "0x0",
7
      "removed": false,
8
      "blockNumber": "0x233",
9
      "blockHash": "0xfc139f5e2edee9e9c888d8df9a2d2226133a9bd87c88ccbd9c930d3d4c9f9ef5",
10
      "transactionHash": "0x66e7a140c8fa27fe98fde923defea7562c3ca2d6bb89798aabec65782c08f63d",
11
      "transactionIndex": "0x0",
12
      "address": "0x42699a7612a82f1d9c36148af9c77354759b210b",
13
      "data": "0x0000000000000000000000000000000000000000000000000000000000000004",
14
      "topics": [
15
        "0x04474795f5b996ff80cb47c148d4c5ccdbe09ef27551820caa9c2f8ed149cce3"
16
      ]
17
    },
18
    {
19
      "logIndex": "0x0",
20
      "removed": false,
21
      "blockNumber": "0x238",
22
      "blockHash": "0x98b0ec0f9fea0018a644959accbe69cd046a8582e89402e1ab0ada91cad644ed",
23
      "transactionHash": "0xdb17aa1c2ce609132f599155d384c0bc5334c988a6c368056d7e167e23eee058",
24
      "transactionIndex": "0x0",
25
      "address": "0x42699a7612a82f1d9c36148af9c77354759b210b",
26
      "data": "0x0000000000000000000000000000000000000000000000000000000000000007",
27
      "topics": [
28
        "0x04474795f5b996ff80cb47c148d4c5ccdbe09ef27551820caa9c2f8ed149cce3"
29
      ]
30
    }
31
  ]
32
}

1
{
2
  "jsonrpc": "2.0",
3
  "id": 1,
4
  "result": [
5
    {
6
      "logIndex": "0x0",
7
      "removed": false,
8
      "blockNumber": "0x233",
9
      "blockHash": "0xfc139f5e2edee9e9c888d8df9a2d2226133a9bd87c88ccbd9c930d3d4c9f9ef5",
10
      "transactionHash": "0x66e7a140c8fa27fe98fde923defea7562c3ca2d6bb89798aabec65782c08f63d",
11
      "transactionIndex": "0x0",
12
      "address": "0x42699a7612a82f1d9c36148af9c77354759b210b",
13
      "data": "0x0000000000000000000000000000000000000000000000000000000000000004",
14
      "topics": [
15
        "0x04474795f5b996ff80cb47c148d4c5ccdbe09ef27551820caa9c2f8ed149cce3"
16
      ]
17
    },
18
    {
19
      "logIndex": "0x0",
20
      "removed": false,
21
      "blockNumber": "0x238",
22
      "blockHash": "0x98b0ec0f9fea0018a644959accbe69cd046a8582e89402e1ab0ada91cad644ed",
23
      "transactionHash": "0xdb17aa1c2ce609132f599155d384c0bc5334c988a6c368056d7e167e23eee058",
24
      "transactionIndex": "0x0",
25
      "address": "0x42699a7612a82f1d9c36148af9c77354759b210b",
26
      "data": "0x0000000000000000000000000000000000000000000000000000000000000007",
27
      "topics": [
28
        "0x04474795f5b996ff80cb47c148d4c5ccdbe09ef27551820caa9c2f8ed149cce3"
29
      ]
30
    }
31
  ]
32
}

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