> For the complete documentation index, see [llms.txt](/llms.txt).

# `eth_newBlockFilter`

Creates a filter in the node, to notify when a new block arrives. To check if the state has changed, call [eth_getFilterChanges](/services/reference/scroll/json-rpc-methods/filter-methods/eth%5Fgetfilterchanges/). This method uses [80 credits](/services/get-started/pricing/) from your daily balance.

Expires after 15 minutes of inactivity

Filters that are not polled using [eth_getFilterChanges](/services/reference/scroll/json-rpc-methods/filter-methods/eth%5Fgetfilterchanges/) automatically expires after 15 minutes of inactivity. Filter IDs can be polled by any connection using the same API key.

## Parameters[​](#parameters "Direct link to Parameters")

None.

## Returns[​](#returns "Direct link to Returns")

`filter ID`: A hexadecimal denoting the newly created filter ID.

## Example[​](#example "Direct link to Example")

Replace `<YOUR-API-KEY>` with an API key from your [Infura dashboard](https://app.infura.io/).

### Request[​](#request "Direct link to Request")

- curl
- WSS

```
curl https://scroll-mainnet.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "eth_newBlockFilter", "params": [], "id": 1}'

```

```
wscat -c wss://scroll-mainnet.infura.io/ws/v3/<YOUR-API-KEY> -x '{"jsonrpc": "2.0", "method": "eth_newBlockFilter", "params": [], "id": 1}'

```

### Response[​](#response "Direct link to Response")

- JSON

```
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x8144114ddff0b3be57ad6a848ee4fe4a44cdda667055"
}

```