> For the complete documentation index, see [llms.txt](https://docs.getblock.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getblock.io/api-reference/bnb-smart-chain-bsc/eth_getunclebyblocknumberandindex-bsc.md).

# eth\_getUncleByBlockNumberAndIndex - BSC

Example code for the eth\_getUncleByBlockNumberAndIndex JSON RPC method. Сomplete guide on how to use eth\_getUncleByBlockNumberAndIndex JSON RPC in GetBlock Web3 documentation.

This method gets uncle block information by block number and uncle index on BSC. BSC uses PoSA consensus and typically does not produce uncle blocks.

## Parameters

| Parameter   | Type   | Required | Description                    |
| ----------- | ------ | -------- | ------------------------------ |
| blockNumber | string | Yes      | Block number (hex) or "latest" |
| index       | string | Yes      | Uncle index (hex)              |

## Request Example

{% tabs %}
{% tab title="cURL" %}

```bash
curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getUncleByBlockNumberAndIndex",
    "params": ["latest", "0x0"],
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="JavaScript (Axios)" %}

```javascript
const axios = require('axios');

const url = 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/';

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

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

{% endtab %}

{% tab title="Python" %}

```python
import requests

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

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

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

{% endtab %}

{% tab title="Rust" %}

```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_getUncleByBlockNumberAndIndex",
        "params": ["latest", "0x0"],
        "id": "getblock.io"
    });

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

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

{% endtab %}
{% endtabs %}

## Response Example

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

## Response Parameters

| Parameter | Type        | Description                         |
| --------- | ----------- | ----------------------------------- |
| result    | object/null | Uncle block (typically null on BSC) |

## Use Cases

* EVM compatibility checks
* Cross-chain development

## Error Handling

| Error Code | Description    |
| ---------- | -------------- |
| -32602     | Invalid params |

## SDK Integration

{% tabs %}
{% tab title="Ethers.js" %}
{% code overflow="wrap" %}

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

const provider = new ethers.JsonRpcProvider('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

const uncle = await provider.send('eth_getUncleByBlockNumberAndIndex', ['latest', '0x0']);
console.log('Uncle:', uncle);
```

{% endcode %}
{% endtab %}

{% tab title="Viem" %}

```javascript
import { createPublicClient, http } from 'viem';
import { bsc } from 'viem/chains';

const client = createPublicClient({
    chain: bsc,
    transport: http('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/')
});

// BSC does not produce uncle blocks
```

{% endtab %}
{% endtabs %}