eth_getUncleCountByBlockHash

Returns the number of uncle blocks referenced by a MegaETH block selected by hash.

Summary

Returns the number of uncle blocks referenced by a block selected by hash. MegaETH does not produce proof-of-work uncles, so valid MegaETH blocks return zero.

Parameters

Position	Name	Type	Required	Description
0	blockHash	DATA, 32 bytes	Yes	Hash of the block to inspect.

Result

The result is a hexadecimal QUANTITY containing the uncle count. For a valid MegaETH block this is zero.

Comparison with Ethereum Standard JSON-RPC

Ethereum Standard

The method returns the number of uncles referenced by the selected block.

MegaETH Node Behavior

MegaETH inherits the compatibility method, but its proof-of-stake L2 blocks do not contain proof-of-work uncles.

MegaETH Public Gateway

The gateway may cache the count for a block hash. A valid Mainnet block returned an uncle count of zero on July 24, 2026.

Errors

The | Scope | column distinguishes method failures from gateway policy errors.

Code	Scope	Message	When it happens
-32602	Method	Invalid params	The block hash is missing or malformed.
-32099	Transport/policy	Payload too large	The request exceeds the public endpoint body limit.

No method-specific errors were observed for a valid block.

Examples

Endpoint: https://mainnet.megaeth.com/rpc

Capture date: July 24, 2026

Outcome: success

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getUncleCountByBlockHash",
  "params": [
    "0x57804c21b747137075b29ce153b4f559345a3624273660c87e81bd57e7cbbc3d"
  ]
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x0"
}

Sources

• Spec: Ethereum Execution APIs method reference
• Probe: MegaETH Mainnet public endpoint, July 24, 2026