> ## Documentation Index
> Fetch the complete documentation index at: https://docs.validationcloud.io/llms.txt
> Use this file to discover all available pages before exploring further.

# eth_getFilterChanges

Polling method for a filter, which returns an array of logs which occurred since last poll.

This method will use `40` [Compute Units](/nodeapi/about/billing).

***

## Reference: [Here](https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_getfilterchanges)

## **Parameters**

1. `QUANTITY` - the filter id.

```javascript theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
params: 
[
  "0x16", // 22
]
```

## Returns

`Array` - Array of log objects, or an empty array if nothing has changed since last poll.

* For filters created with `eth_newBlockFilter` the return are block hashes (`DATA`, 32 Bytes), e.g. `["0x3454645634534..."]`.
* For filters created with `eth_newPendingTransactionFilter` the return are transaction hashes (`DATA`, 32 Bytes), e.g. `["0x6345343454645..."]`.
* For filters created with `eth_newFilter` logs are objects with following params:
  * `removed`: `Boolean` - `true` when the log was removed, due to a chain reorganization. `false` if its a valid log.
  * `logIndex`: `QUANTITY` - integer of the log index position in the block. `null` when its pending log.
  * `transactionIndex`: `QUANTITY` - integer of the transactions index position log was created from. `null` when its pending log.
  * `transactionHash`: `DATA`, 32 Bytes - hash of the transactions this log was created from. `null` when its pending log.
  * `blockHash`: `DATA`, 32 Bytes - hash of the block where this log was in. `null` when its pending. `null` when its pending log.
  * `blockNumber`: `QUANTITY` - the block number where this log was in. `null` when its pending. `null` when its pending log.
  * `address`: `DATA`, 20 Bytes - address from which this log originated.
  * `data`: `DATA` - contains one or more 32 Bytes non-indexed arguments of the log.
  * `topics`: `Array of DATA` - Array of 0 to 4 32 Bytes `DATA` of indexed log arguments. (In *solidity*: The first topic is the *hash* of the signature of the event (e.g. `Deposit(address,bytes32,uint256)`), except you declared the event with the `anonymous` specifier.)

```json theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
// Result
{
  "jsonrpc": "2.0",
  "id": 73,
  "result": []
}
```

<CodeGroup>
  ```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://mainnet.unichain.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0x8f6007f781b8d8e9d7789abe18967790"],"id":73}'
  ```
</CodeGroup>


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