> 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/eth_getfilterchanges-mantle.md).

# eth\_getFilterChanges - Mantle

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

This method polls for filter changes. Returns an array of logs that occurred since last poll for log filters, or an array of block hashes for block filters.

### Parameters

| Parameter | Type   | Description                                                     |
| --------- | ------ | --------------------------------------------------------------- |
| filterId  | string | The filter ID returned by eth\_newFilter or eth\_newBlockFilter |

### 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_getFilterChanges",
    "params": ["0x1a2b3c4d5e6f"],
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="JavaScript (axios)" %}

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_getFilterChanges",
    "params": ["0x1a2b3c4d5e6f"],
    "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));
```

{% endtab %}

{% tab title="Python (requests)" %}

```python
import requests
import json

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

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "eth_getFilterChanges",
    "params": ["0x1a2b3c4d5e6f"],
    "id": "getblock.io"
})

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

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

{% endtab %}

{% tab title="Rust (reqwest)" %}

```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_getFilterChanges",
            "params": ["0x1a2b3c4d5e6f"],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}
```

{% endtab %}
{% endtabs %}

### Response

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": []
}
```

### Response Parameters

| Field  | Type  | Description                                          |
| ------ | ----- | ---------------------------------------------------- |
| result | array | Array of log objects or block hashes since last poll |

### Use Case

The `eth_getFilterChanges` method is essential for:

* Polling for new events
* Block monitoring via HTTP
* Event-driven applications
* Backend services without WebSocket
* Incremental log retrieval

### Error Handling

| Status Code | Error Message    | Cause                           |
| ----------- | ---------------- | ------------------------------- |
| 403         | Forbidden        | Missing or invalid ACCESS-TOKEN |
| -32000      | Filter not found | Invalid or expired filter ID    |

<details>

<summary>Errors and causes</summary>

</details>

### Web3 Integration

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

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

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

const changes = await provider.send('eth_getFilterChanges', ['0x1a2b3c4d5e6f']);
console.log('Filter Changes:', changes);
```

{% endtab %}

{% tab title="Viem" %}

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

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

const changes = await client.request({
    method: 'eth_getFilterChanges',
    params: ['0x1a2b3c4d5e6f']
});
console.log('Filter Changes:', changes);
```

{% endtab %}
{% endtabs %}