eth_newfilter - Worldchain

Example code for the eth_newFilter JSON-RPC method. Complete guide on how to use eth_newFilter JSON-RPC in GetBlock Web3 documentation.

Ths method creates a filter object for notifying when the state changes (logs) on the World Chain network.

Parameters

Parameter	Type	Description
filterObject	object	Filter options including fromBlock, toBlock, address, topics

Request

curl

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [{"fromBlock": "latest", "address": "0x1234567890123456789012345678901234567890", "topics": []}],
    "id": "getblock.io"
}'

JavaScript (axios)

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [{"fromBlock": "latest", "address": "0x1234567890123456789012345678901234567890", "topics": []}],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));

Python (requests)

import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [{"fromBlock": "latest", "address": "0x1234567890123456789012345678901234567890", "topics": []}],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

Rust (reqwest)

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "eth_newFilter",
            "params": [{"fromBlock": "latest", "address": "0x1234567890123456789012345678901234567890", "topics": []}],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x1"
}

Response Parameters

Field	Type	Description
result	string	Filter ID to be used with eth_getFilterChanges

Use Case

The eth_newFilter method on World Chain is typically used for:

• Event subscription

• Log monitoring

• Real-time notifications

• Contract monitoring

Error Handling

Status Code	Error Message	Cause
403	Forbidden	Missing or invalid ACCESS-TOKEN

Web3 Integration

Ethers.js

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

const filterId = await provider.send('eth_newFilter', [{
    fromBlock: 'latest',
    address: '0x1234567890123456789012345678901234567890'
}]);
console.log('Filter ID:', filterId);

Viem

import { createPublicClient, http } from 'viem';
import { worldchain } from 'viem/chains';

const client = createPublicClient({
    chain: worldchain,
    transport: http('https://go.getblock.io/<ACCESS-TOKEN>/')
});

const filterId = await client.createEventFilter({
    address: '0x1234567890123456789012345678901234567890'
});
console.log('Filter:', filterId);