eth_getFilterChanges
curl --request POST \
--url https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/ \
--header 'Content-Type: application/json' \
--data '
{
"id": 1,
"jsonrpc": "2.0",
"method": "eth_getFilterChanges",
"params": [
"0x1"
]
}
'import requests
url = "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload = {
"id": 1,
"jsonrpc": "2.0",
"method": "eth_getFilterChanges",
"params": ["0x1"]
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({id: 1, jsonrpc: '2.0', method: 'eth_getFilterChanges', params: ['0x1']})
};
fetch('https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'id' => 1,
'jsonrpc' => '2.0',
'method' => 'eth_getFilterChanges',
'params' => [
'0x1'
]
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload := strings.NewReader("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"eth_getFilterChanges\",\n \"params\": [\n \"0x1\"\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
.header("Content-Type", "application/json")
.body("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"eth_getFilterChanges\",\n \"params\": [\n \"0x1\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"eth_getFilterChanges\",\n \"params\": [\n \"0x1\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": 1,
"result": [
"0x44b950f3f76ba3d21b439bdd88d4700779704690bec89d0ff3d60116ed38bc3e",
"0x1271571f5ad3d25acea02de04308c570c00e23b9d36cadc3a12af8b3d97e0a16"
]
}Arc node API
eth_getFilterChanges | Arc
Arc API method that returns an array of logs or block/transaction hashes that occurred since the last poll. Arc via Chainstack.
POST
/
eth_getFilterChanges
curl --request POST \
--url https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/ \
--header 'Content-Type: application/json' \
--data '
{
"id": 1,
"jsonrpc": "2.0",
"method": "eth_getFilterChanges",
"params": [
"0x1"
]
}
'import requests
url = "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload = {
"id": 1,
"jsonrpc": "2.0",
"method": "eth_getFilterChanges",
"params": ["0x1"]
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({id: 1, jsonrpc: '2.0', method: 'eth_getFilterChanges', params: ['0x1']})
};
fetch('https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'id' => 1,
'jsonrpc' => '2.0',
'method' => 'eth_getFilterChanges',
'params' => [
'0x1'
]
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload := strings.NewReader("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"eth_getFilterChanges\",\n \"params\": [\n \"0x1\"\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
.header("Content-Type", "application/json")
.body("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"eth_getFilterChanges\",\n \"params\": [\n \"0x1\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"eth_getFilterChanges\",\n \"params\": [\n \"0x1\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": 1,
"result": [
"0x44b950f3f76ba3d21b439bdd88d4700779704690bec89d0ff3d60116ed38bc3e",
"0x1271571f5ad3d25acea02de04308c570c00e23b9d36cadc3a12af8b3d97e0a16"
]
}Arc API method that returns an array of logs or block/transaction hashes that occurred since the last poll. Used with filters created by
eth_newFilter, eth_newBlockFilter, or eth_newPendingTransactionFilter.
Get your own node endpoint todayStart for free and get your app to production levels immediately. No credit card required.You can sign up with your GitHub, X, Google, or Microsoft account.
Parameters
filterId— the filter ID returned from a filter creation method
Response
result— array of changes since last poll:- For log filters: array of log objects
- For block filters: array of block hashes
- For pending transaction filters: array of transaction hashes
eth_getFilterChanges code examples
const ethers = require('ethers');
const NODE_URL = "CHAINSTACK_NODE_URL";
const provider = new ethers.JsonRpcProvider(NODE_URL);
// pathUSD token address
const PATHUSD = "0x20c0000000000000000000000000000000000000";
const TRANSFER_TOPIC = ethers.id("Transfer(address,address,uint256)");
const pollFilter = async () => {
// Create a log filter for Transfer events
const filterId = await provider.send("eth_newFilter", [{
address: PATHUSD,
topics: [TRANSFER_TOPIC]
}]);
console.log(`Created filter: ${filterId}`);
// Poll for changes every 2 seconds
const interval = setInterval(async () => {
const changes = await provider.send("eth_getFilterChanges", [filterId]);
if (changes.length > 0) {
console.log(`\nFound ${changes.length} new Transfer events:`);
for (const log of changes) {
console.log(` Block ${parseInt(log.blockNumber, 16)}: ${log.transactionHash}`);
}
} else {
console.log("No new changes...");
}
}, 2000);
// Stop after 20 seconds
setTimeout(async () => {
clearInterval(interval);
await provider.send("eth_uninstallFilter", [filterId]);
console.log("\nFilter uninstalled");
}, 20000);
};
pollFilter();
from web3 import Web3
import time
node_url = "CHAINSTACK_NODE_URL"
web3 = Web3(Web3.HTTPProvider(node_url))
# pathUSD token address
PATHUSD = "0x20c0000000000000000000000000000000000000"
TRANSFER_TOPIC = web3.keccak(text="Transfer(address,address,uint256)").hex()
# Create a log filter
filter_result = web3.provider.make_request("eth_newFilter", [{
"address": PATHUSD,
"topics": [TRANSFER_TOPIC]
}])
filter_id = filter_result['result']
print(f"Created filter: {filter_id}")
# Poll for changes
try:
for _ in range(10):
changes_result = web3.provider.make_request("eth_getFilterChanges", [filter_id])
changes = changes_result['result']
if changes:
print(f"\nFound {len(changes)} new Transfer events:")
for log in changes:
print(f" Block {int(log['blockNumber'], 16)}: {log['transactionHash']}")
else:
print("No new changes...")
time.sleep(2)
finally:
web3.provider.make_request("eth_uninstallFilter", [filter_id])
print("\nFilter uninstalled")
# First create a filter
curl -X POST "CHAINSTACK_NODE_URL" \
-H "Content-Type: application/json" \
-d '{
"jsonrpc": "2.0",
"method": "eth_newFilter",
"params": [{"address": "0x20c0000000000000000000000000000000000000"}],
"id": 1
}'
# Then poll for changes using the returned filter ID
curl -X POST "CHAINSTACK_NODE_URL" \
-H "Content-Type: application/json" \
-d '{
"jsonrpc": "2.0",
"method": "eth_getFilterChanges",
"params": ["0x1"],
"id": 1
}'
Last modified on August 3, 2026
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