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

# eth\_newFilter

Creates a new filter in the node, based on filter options. Used to notify state changes (logs). To check for state changes call [`eth_getFilterChanges`](https://docs.constellationnetwork.io/stargazer/APIReference/ethereumRPCAPI/eth_getFilterChanges).

**Parameters**[**​**](https://docs.constellationnetwork.io/stargazer/APIReference/ethereumRPCAPI/eth_newFilter#parameters)

| Name   | Type     | Description                       |
| ------ | -------- | --------------------------------- |
| Filter | `Filter` | Filter logs based on this filter. |

Filter

```typescript
type Filter = {
  address?: Address; // Address from which logs generated.
  fromBlock?: HexString<Number> | "latest" | "earliest" | "pending"; // Block number or string the string "latest", "earliest" or "pending" to search from.
  toBlock?: HexString<Number> | "latest" | "earliest" | "pending"; // Block number or string the string "latest", "earliest" or "pending" to search to.
  topics?: HexString<Topic>[]; // Array of 0 - 4 topics.
  blockHash?: HexString<Hash>; // Block from which logs generated.
};
```

**Return Type**[**​**](https://docs.constellationnetwork.io/stargazer/APIReference/ethereumRPCAPI/eth_newFilter#return-type)

`HexString<FilterId>` - The new associated filter id.

**Example**[**​**](https://docs.constellationnetwork.io/stargazer/APIReference/ethereumRPCAPI/eth_newFilter#example)

```typescript
await provider.request({
  method: "eth_newFilter",
  params: [
    {
      topics: [
        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
      ],
    },
  ],
});
// "0x10ff0bfba9472c87932c56632eef8f5cc70910e8e71d"
```


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