> 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/mantle-mnt/web3_sha3-mantle.md).

# web3\_sha3 - Mantle

Example code for the web3\_sha3 JSON-RPC method. Complete guide on how to use web3\_sha3 JSON-RPC in GetBlock Web3 documentation.

This method returns the Keccak-256 hash (not the standardized SHA3-256) of the given data.

### Parameters

| Parameter | Type   | Description                |
| --------- | ------ | -------------------------- |
| data      | string | Data to hash (hex encoded) |

### Request

{% tabs %}
{% tab title="curl" %}
{% code 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": "web3_sha3",
    "params": ["0x68656c6c6f20776f726c64"],
    "id": "getblock.io"
}'
```

{% endcode %}
{% endtab %}

{% tab title="JavaScript (axios)" %}
{% code title="example.js" %}

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "web3_sha3",
    "params": ["0x68656c6c6f20776f726c64"],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.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));
```

{% endcode %}
{% endtab %}

{% tab title="Python (requests)" %}
{% code title="example.py" %}

```python
import requests
import json

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

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "web3_sha3",
    "params": ["0x68656c6c6f20776f726c64"],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)
```

{% endcode %}
{% endtab %}

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

```rust
use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "web3_sha3",
            "params": ["0x68656c6c6f20776f726c64"],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}
```

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

### Response

{% code title="response.json" %}

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad"
}
```

{% endcode %}

### Response Parameters

| Field  | Type   | Description                       |
| ------ | ------ | --------------------------------- |
| result | string | Keccak-256 hash of the given data |

### Use Case

The `web3_sha3` method is essential for:

* Data hashing
* Signature verification
* Address derivation
* Smart contract interactions
* Cryptographic operations

### Error Handling

| Status Code | Error Message  | Cause                           |
| ----------- | -------------- | ------------------------------- |
| 403         | Forbidden      | Missing or invalid ACCESS-TOKEN |
| -32602      | Invalid params | Invalid hex data                |

### Web3 Integration

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

```javascript
import { ethers } from 'ethers';

// Ethers has built-in keccak256
const hash = ethers.keccak256('0x68656c6c6f20776f726c64');
console.log('Keccak256 Hash:', hash);
```

{% endcode %}
{% endtab %}

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

```javascript
import { keccak256, toHex } from 'viem';

const hash = keccak256(toHex('hello world'));
console.log('Keccak256 Hash:', hash);
```

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