# web3\_sha3 - Mantle

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://go.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://go.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://go.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://go.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 %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.getblock.io/api-reference/mantle-mnt/web3_sha3-mantle.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.