eth_getUncleByBlockNumberAndIndex - Polygon

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

The eth_getUncleByBlockNumberAndIndex method returns information about an uncle of a block by number and uncle index position.

Parameters

Parameter

Type

Required

Description

blockNumber

string

Yes

Block number in hex, or "latest", "earliest", "pending"

uncleIndex

string

Yes

Uncle index position in hexadecimal

Request

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getUncleByBlockNumberAndIndex",
    "params": ["0x3A2B5C7", "0x0"],
    "id": "getblock.io"
}'

request.js

import axios from 'axios';

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

const payload = {
    jsonrpc: '2.0',
    method: 'eth_getUncleByBlockNumberAndIndex',
    params: ["0x3A2B5C7", "0x0"],
    id: 'getblock.io'
};

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

request.py

import requests

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

payload = {
    "jsonrpc": "2.0",
    "method": "eth_getUncleByBlockNumberAndIndex",
    "params": ["0x3A2B5C7", "0x0"],
    "id": "getblock.io"
}

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

main.rs

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_getUncleByBlockNumberAndIndex",
            "params": ["0x3A2B5C7", "0x0"],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

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

Response Parameters

Field

Type

Description

jsonrpc

string

JSON-RPC version (2.0)

string

Request identifier

result

varies

Uncle block object or null if not found

Use Case

The eth_getUncleByBlockNumberAndIndex method is useful for:

Ethereum compatibility
Chain analysis

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS-TOKEN

-32600

Invalid Request

Malformed request body

-32602

Invalid params

Invalid method parameters

Web3 Integration

ethers.js

import { ethers } from 'ethers';

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

const result = await provider.send('eth_getUncleByBlockNumberAndIndex', ["0x3A2B5C7", "0x0"]);
console.log('Result:', result);

viem.js

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

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

const result = await client.request({
    method: 'eth_getUncleByBlockNumberAndIndex',
    params: ["0x3A2B5C7", "0x0"]
});
console.log('Result:', result);

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