> 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/worldchain/eth_feehistory-worldchain.md).

# eth\_feehistory - Worldchain

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

Returns historical gas information on the World Chain network, allowing analysis of gas price trends over time.

### Parameters

| Parameter         | Type   | Description                                             |
| ----------------- | ------ | ------------------------------------------------------- |
| blockCount        | string | Number of blocks in the requested range (hex)           |
| newestBlock       | string | Highest block number or "latest", "pending"             |
| rewardPercentiles | array  | Array of percentile values for priority fee calculation |

### Request

{% 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_feeHistory",
    "params": ["0x5", "latest", [25, 50, 75]],
    "id": "getblock.io"
}'
```

{% endtab %}

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

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_feeHistory",
    "params": ["0x5", "latest", [25, 50, 75]],
    "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": "eth_feeHistory",
    "params": ["0x5", "latest", [25, 50, 75]],
    "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": "eth_feeHistory",
            "params": ["0x5", "latest", [25, 50, 75]],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}
```

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

### Response

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "baseFeePerGas": ["0x3B9ACA00", "0x3B9ACA00"],
        "gasUsedRatio": [0.5, 0.6],
        "reward": [["0x59682F00", "0x59682F00", "0x59682F00"]]
    }
}
```

### Response Parameters

| Field         | Type  | Description                              |
| ------------- | ----- | ---------------------------------------- |
| baseFeePerGas | array | Array of base fee per gas for each block |
| gasUsedRatio  | array | Array of gas used ratios for each block  |
| reward        | array | Array of priority fee percentile values  |

### Use Case

The `eth_feeHistory` method on World Chain is typically used for:

* Gas price analysis
* Fee estimation
* Historical trend analysis
* Dynamic fee calculation

### Error Handling

| Status Code | Error Message | Cause                           |
| ----------- | ------------- | ------------------------------- |
| 403         | Forbidden     | Missing or invalid ACCESS-TOKEN |

### Web3 Integration

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

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

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

const feeHistory = await provider.send('eth_feeHistory', ['0x5', 'latest', [25, 50, 75]]);
console.log('Fee History:', feeHistory);
```

{% endcode %}
{% endtab %}

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

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

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

const feeHistory = await client.getFeeHistory({
    blockCount: 5,
    rewardPercentiles: [25, 50, 75]
});
console.log('Fee History:', feeHistory);
```

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