debug_getRawHeader

Returns the RLP-encoded header for a MegaETH block.

Summary

Returns a block header encoded with Recursive Length Prefix (RLP). The public MegaETH endpoint supports this standard debug method.

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 DATA value containing the RLP-encoded header. Decode the bytes as an Ethereum block header rather than treating them as a JSON block object.

Comparison with Ethereum Standard JSON-RPC

Ethereum Standard

The method returns the canonical RLP representation of the selected block header.

MegaETH Node Behavior

MegaETH exposes the method through its debug namespace and accepts a block number or tag. The encoded header includes the fields used by the selected MegaETH hardfork.

MegaETH Public Gateway

The public gateway forwards this method through its compute pool and may cache immutable block selections.

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.
-32000	Method	Server error	The block is unavailable or cannot be encoded.
-32099	Transport/policy	Payload too large	The request exceeds the public endpoint body limit.

Examples

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

Capture date: July 24, 2026

Outcome: success

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "debug_getRawHeader",
  "params": ["0x1"]
}

The RLP value is abbreviated below.

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0xf9026ba09425ed45fa0843e257166258f69bced9ef9eb2d0bb23c6b5a901fba3…"
}

Sources

• Spec: Ethereum Execution APIs, src/debug/getters.yaml
• Probe: MegaETH Mainnet public endpoint, July 24, 2026