eth_getBlockByNumber - Plasma RPC Method

Returns information about a block by block number on Plasma.

Why Plasma? Build on an EVM Layer 1 for stablecoin payments with PlasmaBFT consensus and Reth execution with 1 second blocks, XPL gas, full EVM JSON-RPC, and debug plus txpool on Dwellir.

When to Use This MethodCopy Anchor Link

eth_getBlockByNumber is essential for payment app developers, wallet teams, and teams shipping Solidity contracts for dollar transfers:

• Block explorers and analytics dashboards: Display comprehensive block data and chain metrics for end-user interfaces on Plasma
• 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 stablecoin transfers, payment apps, and wallets that need 1 second confirmation
• Timestamp-based logic: Verify block age and enforce time-dependent contract logic on an EVM Layer 1 for stablecoin payments with PlasmaBFT consensus and Reth execution

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockByNumber",
  "params": ["latest", false],
  "id": 1
}

Common Use CasesCopy Anchor Link

1. Process All Transactions in the Latest BlockCopy Anchor Link

Fetch the latest block on Plasma 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-plasma-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 LoopCopy Anchor Link

Poll eth_getBlockByNumber at regular intervals to detect new blocks as they are produced on Plasma. 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-plasma-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 ChainsCopy Anchor Link

Layer 2 rollup chains on an EVM Layer 1 for stablecoin payments with PlasmaBFT consensus and Reth execution 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-plasma-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())
    }
}

Best PracticesCopy Anchor Link

• 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 ExamplesCopy Anchor Link

Error HandlingCopy Anchor Link

Related MethodsCopy Anchor Link

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