> For the complete documentation index, see [llms.txt](https://slice-ledger.gitbook.io/sliceledger/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://slice-ledger.gitbook.io/sliceledger/api/newblockfilter.md).

# newBlockFilter

Filter IDs will be valid for up to fifteen minutes, and can polled by any connection using the same v3 project ID.

#### EXAMPLE

```
## JSON-RPC over HTTPS POST
curl https://mainnet-slice-rpc.com \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_newBlockFilter","params":[],"id":1}'

## JSON-RPC over WSS
wscat -c ws://mainnet-slice-rpc.com
>{"jsonrpc":"2.0","method":"eth_newBlockFilter","params":[],"id":1}
```

### RESPONSE

#### RESULT FIELDS

* `FILTER ID` - A string denoting the newly created filter ID

#### BODY

```json
{
    "jsonrpc":"2.0",
    "id":1,
    "result":"0x81440bfbd6138ec9fe6d6ec4398b0b4879fb182f3cd8"
}
```