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POST
/
2fc1de7f08c0465f6a28e3c355e0cb14
eth_getUncleByBlockHashAndIndex
curl --request POST \
  --url https://base-mainnet.core.chainstack.com/2fc1de7f08c0465f6a28e3c355e0cb14 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_getUncleByBlockHashAndIndex",
  "id": 1,
  "params": [
    "0xb3e8c898cfbf4072eaad440e8606e578a33ca4fafc27d7936d83d7392ba3e939",
    "0x0"
  ]
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {}
}
Base API method that returns information about an uncle block by block hash and uncle index position. Note that uncles are a concept specific to proof-of-work chains and don’t exist in proof-of-stake chains like Base.
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​
Parameters

  • BLOCK HASH - 32-byte hash of the block containing the uncle
  • UNCLE INDEX POSITION - the uncle’s index position. It’s a hexadecimal value representing the uncle’s position in the block’s uncle list.

​
Response

  • result — A block object with uncle information, or null when no uncle exists at the given index. The block object includes:
    • number: The block number
    • hash: Hash of the uncle block
    • parentHash: Hash of the parent block
    • nonce: Hash of the generated proof-of-work
    • sha3Uncles: SHA3 of the uncles data in the block
    • logsBloom: The bloom filter for the logs of the block
    • transactionsRoot: The root of the transaction trie of the block
    • stateRoot: The root of the final state trie of the block
    • receiptsRoot: The root of the receipts trie of the block
    • miner: The address of the beneficiary to whom the mining rewards were given
    • difficulty: Integer of the difficulty for this block
    • totalDifficulty: Integer of the total difficulty of the chain until this block
    • extraData: The “extra data” field of this block
    • size: Integer the size of this block in bytes
    • gasLimit: The maximum gas allowed in this block
    • gasUsed: The total used gas by all transactions in this block
    • timestamp: The unix timestamp for when the block was collated

​
Use case

The eth_getUncleByBlockHashAndIndex method is primarily used in proof-of-work networks for:
  • Analyzing blockchain history and network behavior
  • Calculating mining rewards (as uncle blocks receive partial rewards)
  • Studying network propagation and consensus
  • Research and analysis of fork events
Note: In Base, which is a proof-of-stake chain, this method will typically return null as there are no uncle blocks in PoS networks.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_getUncleByBlockHashAndIndex
​
id
integer
default:1
​
params
string[]
Required array length: 2 elements

Response

200 - application/json

Information about the uncle block

​
jsonrpc
string
​
id
integer
​
result
object

Uncle block object, or null when no uncle exists

Last modified on August 7, 2025