eth_newFilter - Mantle

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

This method creates a filter object to notify when state changes (logs). To check if the state has changed, call eth_getFilterChanges.

Parameters

Parameter

Type

Description

filterObject

object

Filter options object

Filter Object:

Field

Type

Description

fromBlock

string

Starting block (hex or tag)

toBlock

string

Ending block (hex or tag)

address

string/array

Contract address(es) to filter

topics

array

Array of topic filters

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": "0x3F6700",
        "toBlock": "0x3F6800",
        "address": "0x201EBa5CC46D216Ce6DC03F6a759e8E766e956aE",
        "topics": []
    }],
    "id": "getblock.io"
}'

JavaScript (axios)

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [{
        "fromBlock": "0x3F6700",
        "toBlock": "0x3F6800",
        "address": "0x201EBa5CC46D216Ce6DC03F6a759e8E766e956aE",
        "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": "0x3F6700",
        "toBlock": "0x3F6800",
        "address": "0x201EBa5CC46D216Ce6DC03F6a759e8E766e956aE",
        "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": "0x3F6700",
                "toBlock": "0x3F6800",
                "address": "0x201EBa5CC46D216Ce6DC03F6a759e8E766e956aE",
                "topics": []
            }],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

Response (JSON)

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x1a2b3c4d5e6f"
}

Response Parameters

Field

Type

Description

result

string

Filter ID to use with eth_getFilterChanges

Use Case

The eth_newFilter method is essential for:

Event monitoring without WebSocket
Log polling applications
Contract event tracking
Backend services monitoring events
DApp event listeners

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS-TOKEN

-32602

Invalid params

Invalid filter parameters

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: '0x3F6700',
    toBlock: '0x3F6800',
    address: '0x201EBa5CC46D216Ce6DC03F6a759e8E766e956aE'
}]);
console.log('Filter ID:', filterId);

Viem

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

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

const filterId = await client.request({
    method: 'eth_newFilter',
    params: [{
        fromBlock: '0x3F6700',
        toBlock: '0x3F6800',
        address: '0x201EBa5CC46D216Ce6DC03F6a759e8E766e956aE'
    }]
});
console.log('Filter ID:', filterId);

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