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.

Get you own node endpoint today

Start for free and get your app to production levels immediately. No credit card required.

You can sign up with your GitHub, X, Google, or Microsoft account.

​
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

Response

200 - application/json

Information about the uncle block

The response is of type object.

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.

Get you own node endpoint today

Start for free and get your app to production levels immediately. No credit card required.

You can sign up with your GitHub, X, Google, or Microsoft account.

​
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

Response

200 - application/json

Information about the uncle block

The response is of type object.