> For the complete documentation index, see [llms.txt](https://docs.rpcfast.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rpcfast.com/rpc-fast-saas-evm/ethereum-api/eth_newfilter-ethereum.md).

# eth\_newFilter - Ethereum

Builds up a filter object which notifies you every time the state changes. A filter object is based on filter options and shows changes via the command eth\_getFilterChanges

## How to Use the eth\_newFilter Method

### **Parameters**

Object - The filter options:

* fromBlock: QUANTITY|TAG - (variable, default statement: "latest") the string "latest" or "pending", or an integer block number for the last mined block, returns "earliest" if the transaction wasn’t mined yet.
* toBlock: QUANTITY|TAG - (variable, default statement: "latest") the string "latest" or "pending", or an integer block number for the last mined block, returns "earliest" if the transaction wasn’t mined yet.
* address: DATA|Array, 20 Bytes - (variabel) An address of a contract or a list of addresses from which logs should originate.
* topics: Array of DATA, - (variable) Array of 32 Bytes DATA order-dependent topics. Each topic can also contain DATA Arrays with "or" options.

### **What you receive**

QUANTITY - A filter id.

### Sample

Here is a typical appliance example.

#### Call

{% tabs %}
{% tab title="Curl" %}

```bash
curl https://eth-mainnet.rpcfast.com/?api_key=<key> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_newFilter","params":[{"topics":["0x0000000000000000000000000000000000000000000000000000000012341234"]}],"id":1}'

```

{% endtab %}
{% endtabs %}

#### Outcome

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x7185030cb5dabae60f32b996a4ab04a3"
}
```


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