eth_protocolVersion

Returns the Ethereum protocol version reported by the MegaETH RPC node.

Summary

Returns the Ethereum protocol version reported by the connected node. The public MegaETH endpoint supports this legacy compatibility method.

Parameters

None.

Result

The result is a hexadecimal QUANTITY. Do not confuse this compatibility value with the MegaETH chain ID or network ID.

Comparison with Ethereum Standard JSON-RPC

Ethereum Standard

The legacy method reports an Ethereum wire-protocol version and takes no parameters.

MegaETH Node Behavior

MegaETH exposes the inherited compatibility method through the eth namespace.

MegaETH Public Gateway

The gateway treats this response as immutable and may cache it. Callers should not use this value for chain selection; use eth_chainId instead.

Errors

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

Code	Scope	Message	When it happens
-32602	Request	Invalid params	Unexpected parameters are supplied.
-32099	Transport/policy	Payload too large	The request exceeds the public endpoint body limit.

No method-specific errors were observed.

Examples

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

Capture date: July 24, 2026

Outcome: success

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_protocolVersion",
  "params": []
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x5"
}

Sources

• Probe: MegaETH Mainnet public endpoint, July 24, 2026