> 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/abstract/zks_estimatefee-abstract.md).

# zks\_estimateFee - Abstract

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

Estimates the fee for a transaction under the ZK fee model, returning the gas limit, the gas-per-pubdata limit, and the max fee and priority fee per gas — everything needed to populate an Abstract transaction.

## Parameters

| Parameter | Type   | Required | Description                                 |
| --------- | ------ | -------- | ------------------------------------------- |
| request   | object | Yes      | Transaction request (from, to, data, value) |

## Request

{% tabs %}
{% tab title="cURL" %}
{% code overflow="wrap" %}

```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": "zks_estimateFee",
    "params": [{"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "data": "0x"}],
    "id": "getblock.io"
}'
```

{% endcode %}
{% endtab %}

{% tab title="Axios" %}
{% code title="example.js" %}

```javascript
const axios = require('axios');
const response = await axios.post('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/', { jsonrpc: '2.0', method: 'zks_estimateFee', params: [{"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "data": "0x"}], id: 'getblock.io' }, { headers: { 'Content-Type': 'application/json' } });
console.log(response.data.result);
```

{% endcode %}
{% endtab %}

{% tab title="Request" %}
{% code title="example.py" %}

```python
import requests
response = requests.post('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/', headers={'Content-Type': 'application/json'}, json={'jsonrpc': '2.0', 'method': 'zks_estimateFee', 'params': [{"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "data": "0x"}], 'id': 'getblock.io'})
print(response.json())
```

{% endcode %}
{% endtab %}

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

```rust
use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    let res = client.post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/").json(&json!({"jsonrpc":"2.0","method":"zks_estimateFee","params":[{"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "data": "0x"}],"id":"getblock.io"})).send().await?.json::<Value>().await?;
    println!("{}", res["result"]);
    Ok(())
}
```

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

## Response

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "gas_limit": "0x5208",
        "gas_per_pubdata_limit": "0x320",
        "max_fee_per_gas": "0x5f5e100",
        "max_priority_fee_per_gas": "0x0"
    }
}
```

## Response Fields

| Field                    | Type   | Description               |
| ------------------------ | ------ | ------------------------- |
| gas\_limit               | string | Estimated gas limit       |
| gas\_per\_pubdata\_limit | string | Gas per pubdata byte      |
| max\_fee\_per\_gas       | string | Suggested max fee per gas |

## Use Cases

* **Transaction Building**: Populate ZK fee fields
* **Wallets**: Show an accurate fee estimate

## Error Handling

| Error                     | Message        | Description                                       |
| ------------------------- | -------------- | ------------------------------------------------- |
| -32602 / Invalid params   | Invalid params | A parameter was malformed                         |
| 403 / RBAC: access denied | Access denied  | The GetBlock access token is missing or incorrect |