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

# `eth_getUncleByBlockNumberAndIndex`

Returns information about an uncle of a block given the block number and the uncle index position. This method uses [150 credits](/services/get-started/pricing/) from your daily balance.

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

- `block parameter`: [_Required_] A hexadecimal block number, or one of the string tags `latest`, `earliest`, `pending`, `safe`, or `finalized`. See the [default block parameter](https://ethereum.org/en/developers/docs/apis/json-rpc/#default-block).
- `uncle index position`: [_Required_] A hexadecimal equivalent of the integer indicating the uncle's index position.

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

A block object, or null when no block was found. The block object returned will consist of the following keys and their values:

- `number`: The block number. `Null` when the returned block is the pending block.
- `hash`: 32 bytes. Hash of the block. `Null` when its pending block.
- `parentHash`: 32 bytes. Hash of the parent block.
- `nonce`: 8 bytes. Hash of the generated proof-of-work. `Null` when the returned block is the pending block.
- `sha3Uncles`: 32 bytes. The SHA3 of the uncles data in the block.
- `logsBloom`: 256 bytes. The Bloom filter for the logs of the block. `Null` when the returned block is the pending block.
- `transactionsRoot`: 32 bytes. The root of the transaction trie of the block.
- `stateRoot`: 32 bytes. The root of the final state trie of the block.
- `receiptsRoot`: 32 bytes. The root of the receipts trie of the block.
- `miner`: 20 bytes. The address of the beneficiary to whom the mining rewards were given.
- `difficulty`: The hexadecimal of the difficulty for this block.
- `totalDifficulty`: The hexadecimal of the total difficulty of the chain until this block.
- `extraData`: The "extra data" field of this block.
- `size`: The hexadecimal of the size of this block in bytes.
- `gasLimit`: Maximum gas allowed in this block.
- `gasUsed`: Total used gas by all transactions in this block.
- `timestamp`: The unix timestamp for when the block was collated.
- `uncles`: (Array). An array of uncle hashes.

note

An uncle doesn't contain individual transactions.

## 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://avalanche-mainnet.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "eth_getUncleByBlockNumberAndIndex", "params": ["0x29c", "0x0"], "id": 1}'

```

```
wscat -c wss://avalanche-mainnet.infura.io/ws/v3/<YOUR-API-KEY> -x '{"jsonrpc": "2.0", "method": "eth_getUncleByBlockNumberAndIndex", "params": ["0x29c", "0x0"], "id": 1}'

```

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

- JSON

```
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "difficulty": "0x57f117f5c",
    "extraData": "0x476574682f76312e302e302f77696e646f77732f676f312e342e32",
    "gasLimit": "0x1388",
    "gasUsed": "0x0",
    "hash": "0x932bdf904546a2287a2c9b2ede37925f698a7657484b172d4e5184f80bdd464d",
    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "miner": "0x5bf5e9cf9b456d6591073513de7fd69a9bef04bc",
    "mixHash": "0x4500aa4ee2b3044a155252e35273770edeb2ab6f8cb19ca8e732771484462169",
    "nonce": "0x24732773618192ac",
    "number": "0x299",
    "parentHash": "0xa779859b1ee558258b7008bbabff272280136c5dd3eb3ea3bfa8f6ae03bf91e5",
    "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
    "size": "0x21d",
    "stateRoot": "0x2604fbf5183f5360da249b51f1b9f1e0f315d2ff3ffa1a4143ff221ad9ca1fec",
    "timestamp": "0x55ba4827",
    "totalDifficulty": null,
    "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "uncles": []
  }
}

```