# eth\_newFilter - Celo

This method creates a filter object for logs on the Celo network, which can be polled with `eth_getFilterChanges`. This is useful for tracking specific events like cUSD transfers or DeFi protocol activity.

## Parameters

| Parameter    | Type   | Required | Description    |
| ------------ | ------ | -------- | -------------- |
| filterObject | object | Yes      | Filter options |

### Filter Object

| Field     | Type         | Required | Description          |
| --------- | ------------ | -------- | -------------------- |
| fromBlock | string       | No       | Starting block       |
| toBlock   | string       | No       | Ending block         |
| address   | string/array | No       | Contract address(es) |
| topics    | array        | No       | Event topics         |

## Request Example

{% tabs %}
{% tab title="cURL" %}
{% code title="curl" %}

```bash
curl -X POST https://go.getblock.io/<ACCESS-TOKEN>/ \
-H "Content-Type: application/json" \
-d '{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "method": "eth_newFilter",
  "params": [{
    "fromBlock": "latest",
    "address": "0x765DE816845861e75A25fCA122bb6898B8B1282a",
    "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
  }]
}'
```

{% endcode %}
{% endtab %}

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

```javascript
const axios = require('axios');

const url = 'https://go.getblock.io/<ACCESS-TOKEN>/';

const payload = {
  jsonrpc: '2.0',
  id: 'getblock.io',
  method: 'eth_newFilter',
  params: [{
    fromBlock: 'latest',
    address: '0x765DE816845861e75A25fCA122bb6898B8B1282a',
    topics: ['0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef']
  }]
};

axios.post(url, payload, {
  headers: { 'Content-Type': 'application/json' }
})
.then(response => console.log(response.data))
.catch(error => console.error(error));
```

{% endcode %}
{% endtab %}

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

```python
import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = {
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "method": "eth_newFilter",
    "params": [{
        "fromBlock": "latest",
        "address": "0x765DE816845861e75A25fCA122bb6898B8B1282a",
        "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
    }]
}

response = requests.post(url, headers={"Content-Type": "application/json"}, json=payload)
print(response.json())
```

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

## Response Example

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

```json
{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "result": "0x1"
}
```

{% endcode %}

## Response Definition

| Field  | Type   | Description |
| ------ | ------ | ----------- |
| result | string | Filter ID   |

## Use Cases

* Track stablecoin transfers (cUSD, cEUR)
* Monitor DeFi events
* Build event notification systems
* Index contract events

## Error Handling

| Error Code | Description    |
| ---------- | -------------- |
| -32602     | Invalid params |
| -32603     | Internal error |

## SDK Integration

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

```javascript
const { ethers } = require('ethers');

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

const filter = {
  address: '0x765DE816845861e75A25fCA122bb6898B8B1282a',
  topics: ['0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef']
};

provider.on(filter, (log) => {
  console.log('Transfer event:', log);
});
```

{% 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/celo/eth_newfilter-celo.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.