eth_getBlockByNumber - MegaETH RPC Method

Returns information about a block by block number on MegaETH.

Why MegaETH? Build on the first real-time blockchain with sub-millisecond latency and 100,000+ TPS with sub-millisecond transaction streaming with 100,000+ sustained TPS and full EVM compatibility.

When to Use This Method

eth_getBlockByNumber is essential for high-frequency DeFi developers, gaming studios, and teams building real-time applications:

• Block explorers and analytics dashboards: Display comprehensive block data and chain metrics for end-user interfaces on MegaETH
• Transaction indexers processing block contents: Extract and index every transaction within a block for data pipelines and search backends
• Cross-chain bridges verifying block data: Validate block headers and transaction proofs for high-frequency trading, real-time gaming, instant payments, and latency-sensitive applications
• Timestamp-based logic: Verify block age and enforce time-dependent contract logic on the first real-time blockchain with sub-millisecond latency and 100,000+ TPS

Common Use Cases

1. Process All Transactions in the Latest Block

Fetch the latest block on MegaETH with full transaction objects, then iterate through each transaction to extract sender, receiver, value, and gas data. This pattern powers indexers, analytics dashboards, and event backfill pipelines.

import { JsonRpcProvider, formatEther } from 'ethers';

const provider = new JsonRpcProvider('https://api-megaeth-mainnet.n.dwellir.com/YOUR_API_KEY');

async function processLatestBlock() {
  const block = await provider.getBlock('latest', true);

  if (!block) return;

  console.log(`Block #${block.number}: ${block.transactions.length} transactions`);

  for (const tx of block.prefetchedTransactions) {
    console.log(`  ${tx.hash}`);
    console.log(`    From: ${tx.from}  To: ${tx.to}`);
    console.log(`    Value: ${formatEther(tx.value)}  Gas: ${tx.gasLimit.toString()}`);
  }
}

processLatestBlock();

2. Monitor New Blocks with a Polling Loop

Poll eth_getBlockByNumber at regular intervals to detect new blocks as they are produced on MegaETH. This lightweight pattern is suitable for bots, watchers, and notification services that need near-real-time block awareness.

from web3 import Web3
import time

w3 = Web3(Web3.HTTPProvider('https://api-megaeth-mainnet.n.dwellir.com/YOUR_API_KEY'))

last_block = w3.eth.block_number

print(f'Starting from block #{last_block}')

while True:
    current_block = w3.eth.block_number
    if current_block > last_block:
        for block_num in range(last_block + 1, current_block + 1):
            block = w3.eth.get_block(block_num)
            tx_count = len(block.transactions)
            print(f'New block #{block.number}: {tx_count} txns, '
                  f'gas used {block.gasUsed}')
        last_block = current_block
    time.sleep(2)

3. Verify Block Finality on L2 Chains

Layer 2 rollup chains on the first real-time blockchain with sub-millisecond latency and 100,000+ TPS expose additional block tags that indicate settlement confidence. Use safe or finalized tags alongside the base latest tag for use cases requiring strong finality guarantees.

package main

import (
    "context"
    "fmt"
    "log"
    "math/big"

    "github.com/ethereum/go-ethereum/ethclient"
)

func main() {
    client, _ := ethclient.Dial("https://api-megaeth-mainnet.n.dwellir.com/YOUR_API_KEY")

    // Latest block (may be unconfirmed on L2)
    latest, _ := client.BlockByNumber(context.Background(), nil)
    fmt.Printf("Latest block: %d (timestamp: %d)\n",
        latest.Number().Uint64(), latest.Time())

    // Finalized block (settled on L1 for rollups)
    finalized, _ := client.BlockByNumber(context.Background(),
        big.NewInt(int64(RPCLatestBlockNumber-32))) // placeholder: use rpc.FinalizedBlockNumber
    if finalized != nil {
        fmt.Printf("Finalized block: %d\n", finalized.Number().Uint64())
    }
}

Full Block Restriction

// Get block with transaction hashes
const block = await provider.getBlock('latest', false);

// Fetch full transaction details as needed
for (const txHash of block.transactions) {
  const tx = await provider.getTransaction(txHash);
  console.log('Transaction:', tx);
}

Best Practices

• Cache block data by block number: Blocks are immutable once finalized, so cache results indefinitely keyed by block number to eliminate redundant API calls
• Use latest tag for most use cases; avoid pending for production: The pending tag returns speculative data that may never be included in the canonical chain
• For L2 chains, check chain-specific finality tags: Tags like safe and finalized provide settlement guarantees specific to each rollup's proof mechanism
• Combine with eth_getBlockReceipts for efficient receipt scanning: When you need both block headers and transaction outcomes, use eth_getBlockReceipts alongside this method rather than fetching receipts individually

Code Examples

Error Handling

Related Methods

• eth_blockNumber - Get latest block number
• eth_getBlockByHash - Get block by hash
• eth_getTransactionByHash - Get transaction details