eth_newPendingTransactionFilter - Optimism

Example code for the eth_newPendingTransactionFilter json-rpc method. Сomplete guide on how to use eth_newPendingTransactionFilter json-rpc in GetBlock.io Web3 documentation.

This method creates a filter that can be polled to receive notifications about new pending transactions.

Parameters

None

Request Sample

cURL

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

JavaScript (Axios)

const axios = require('axios');

const url = 'https://go.getblock.io/<ACCESS-TOKEN>/';

const payload = {
    jsonrpc: '2.0',
    method: 'eth_newPendingTransactionFilter',
    params: [],
    id: 'getblock.io'
};

axios.post(url, payload, {
    headers: { 'Content-Type': 'application/json' }
})
.then(response => console.log(response.data))
.catch(error => console.error(error));

Python

import requests

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

payload = {
    "jsonrpc": "2.0",
    "method": "eth_newPendingTransactionFilter",
    "params": [],
    "id": "getblock.io"
}

response = requests.post(url, headers={"Content-Type": "application/json"}, json=payload)
print(response.json())

Rust

use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    
    let payload = json!({
        "jsonrpc": "2.0",
        "method": "eth_newPendingTransactionFilter",
        "params": [],
        "id": "getblock.io"
    });

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);
    
    Ok(())
}

Response

A successful response returns the following:

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x2871b63cab64878d61f16974fbf11c7d"
}

Response Parameters

id: A unique request identifier, matching the id sent in the request body.
jsonrpc: Specifies the use of JSON-RPC version 2.0.
result: A filter ID that can be used with eth_getFilterChanges.

Use Case

The eth_newPendingTransactionFilter method is commonly used for:

Mempool monitoring
Transaction tracking
Pending transaction analysis

Error Handling

Error Code

Description

-32603

Internal error

-32601

Method not supported

Web3 Integration

Ethers.js

const { ethers } = require('ethers');

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

provider.on('pending', (txHash) => {
    console.log('Pending tx:', txHash);
});

Viem

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

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

const unwatch = client.watchPendingTransactions({
    onTransactions: hashes => console.log(hashes)
});

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