eth_getUncleCountByBlockNumber

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

Summary

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

Parameters

Position	Name	Type	Required	Description
0	block	QUANTITY or block tag	Yes	Block number or latest, safe, finalized, earliest, or pending.

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 immutable selections and treats head tags as dynamic. The latest 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 selector 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_getUncleCountByBlockNumber",
  "params": ["latest"]
}

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

Sources

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