# eth\_getUncleCountByBlockHash - BSC

The `eth_getUncleCountByBlockHash` method returns the number of uncles in a block by block hash. On BSC with PoSA consensus, this typically returns 0.

{% hint style="info" %}
BSC uses PoSA consensus and does not produce uncle blocks in normal operation, so this method will generally return 0 (0x0).
{% endhint %}

## Parameters

| Parameter | Type   | Required | Description        |
| --------- | ------ | -------- | ------------------ |
| blockHash | string | Yes      | 32-byte block hash |

## Request Example

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

```bash
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getUncleCountByBlockHash",
    "params": ["0x4e3a3754410177e6937ef1f84bba68ea139e8d1a2258c5f85db9f1cd715a1bdd"],
    "id": "getblock.io"
}'
```

{% endcode %}
{% endtab %}

{% tab title="JavaScript (Axios)" %}
{% code title="request.js" %}

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

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

const payload = {
    jsonrpc: '2.0',
    method: 'eth_getUncleCountByBlockHash',
    params: ['0x4e3a3754410177e6937ef1f84bba68ea139e8d1a2258c5f85db9f1cd715a1bdd'],
    id: 'getblock.io'
};

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

{% endcode %}
{% endtab %}

{% tab title="Python" %}
{% code title="request.py" %}

```python
import requests

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

payload = {
    "jsonrpc": "2.0",
    "method": "eth_getUncleCountByBlockHash",
    "params": ["0x4e3a3754410177e6937ef1f84bba68ea139e8d1a2258c5f85db9f1cd715a1bdd"],
    "id": "getblock.io"
}

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

{% endcode %}
{% endtab %}

{% tab title="Rust" %}
{% code title="main.rs" %}

```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_getUncleCountByBlockHash",
        "params": ["0x4e3a3754410177e6937ef1f84bba68ea139e8d1a2258c5f85db9f1cd715a1bdd"],
        "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(())
}
```

{% endcode %}
{% endtab %}
{% endtabs %}

## Response Example

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x0"
}
```

## Response Parameters

| Parameter | Type   | Description              |
| --------- | ------ | ------------------------ |
| result    | string | Uncle count (0x0 on BSC) |

## Use Cases

* EVM compatibility verification
* Cross-chain applications

## Error Handling

| Error Code  | Description     |
| ----------- | --------------- |
| -32602      | Invalid params  |
| null result | Block not found |

## SDK Integration

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

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

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

const count = await provider.send('eth_getUncleCountByBlockHash', [
    '0x4e3a3754410177e6937ef1f84bba68ea139e8d1a2258c5f85db9f1cd715a1bdd'
]);
console.log('Uncle Count:', parseInt(count, 16));
```

{% endcode %}
{% endtab %}

{% tab title="Viem" %}
{% code title="viem.js" %}

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

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

// BSC does not produce uncle blocks - always returns 0
```

{% endcode %}
{% endtab %}
{% endtabs %}


---

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